Morbidity and Mortality Weekly Report Weekly June 6, 2003 / Vol. 52 / No. 22 depar depar depar depar department of health and human ser tment of health and human ser tment of health and human ser tment of health and human ser tment of health and human services vices vices vices vices Centers for Disease Control and Prevention Centers for Disease Control and Prevention Centers for Disease Control and Prevention Centers for Disease Control and Prevention Centers for Disease Control and Prevention INSIDE 516 Update: Influenza Activity — United States and Worldwide, 2002–03 Season, and Composition of the 2003–04 Influenza Vaccine 521 Progress Toward Poliomyelitis Eradication — Southern Africa, 2001–March 2003 525 Update: Severe Acute Respiratory Syndrome — United States, June 4, 2003 Surveillance Data from Swimming Pool Inspections — Selected States and Counties, United States, May–September 2002 Swimming is the second most popular exercise activity in the United States, with approximately 360 million annual visits to recreational water venues (1). This exposure increases the potential for the spread of recreational water illnesses (RWIs) (e.g., cryptosporidiosis, giardiasis, and shigellosis). Since the 1980s, the number of reported RWI outbreaks has increased steadily (2). Local environmental health programs inspect public and semipublic pools periodically to determine com- pliance with local and state health regulations. During inspections for regulatory compliance, data pertaining to pool water chemistry, filtration and recirculation systems, and management and operations are collected. This report sum- marizes pool inspection data from databases at six sites across the United States collected during May 1–September 1, 2002. The findings underscore the utility of these data for public- health decision making and the need for increased training and vigilance by pool operators to ensure high-quality swim- ming pool water for use by the public. Data from 22,131 pool inspections were collected from the Allegheny County Department of Health, Pennsylvania (n = 713); the Florida Department of Health, Bureau of Water Programs (n = 19,604); the Los Angeles County Department of Health Services, California (n = 1,606); the St. Louis County Department of Public Health, Minnesota (n= 34); the City of St. Paul Office of License, Inspections, and Environmental Protection, St. Paul, Minnesota (n = 56); and the Wyoming Department of Agriculture (n = 118). The sites selected were a convenience sample of pool inspection programs contacted that had computerized data available. Because of data incompatibilities, some inspections conducted at some sites might not have been part of the final analysis. The data were merged into a single SAS database, including date of inspection, pool type, water-chemistry data (e.g., free chlorine and pH levels), filtration and recirculation system data (e.g., operating filters and approved water turn- over rates), and policy and management data (e.g., record keeping and pool operator training). A violation was noted when an inspection item was not in compliance with state or local swimming pool codes. Other inspection items (e.g., sup- port facilities and injury control) were not addressed in this study. A total of 21,561 violations of pool codes were documented during the 22,131 inspections; the majority (67.5%) occurred in pools for which no pool type (e.g., hotel/motel) was speci- fied (Table 1). Approximately one half (45.9%) of inspec- tions indicated no violations. The majority of inspections (54.1%) found one or more violations (median: one; range: one to 12), and 8.3% of inspections resulted in immediate closure of the pool pending corrections of serious violation items (e.g., lack of disinfectant). Of total violations, water- chemistry violations comprised 38.7%, followed by filtration and recirculation system (38.6%), and policy and manage- ment (22.7%). For the 24.3% of inspections for which pool type could be ascertained (typed inspections), a range of vio- lations occurred (Table 2). For typed inspections collecting free chlorine data, 4.5%–18.4% reported violations. The high- est percentage (18.4%) of violations occurred in child wad- ing pools, medical/therapy pools (14.3%), and hotel/motel
Transcript
Morbidity and Mortality Weekly Report
Weekly June 6, 2003 / Vol. 52 / No. 22
depardepardepardepardepartment of health and human sertment of health and human sertment of health and human sertment of health and human sertment of health and human servicesvicesvicesvicesvicesCenters for Disease Control and PreventionCenters for Disease Control and PreventionCenters for Disease Control and PreventionCenters for Disease Control and PreventionCenters for Disease Control and Prevention
INSIDE
516 Update: Influenza Activity — United States andWorldwide, 2002–03 Season, and Composition of the2003–04 Influenza Vaccine
525 Update: Severe Acute Respiratory Syndrome — UnitedStates, June 4, 2003
Surveillance Data from Swimming Pool Inspections — Selected Statesand Counties, United States, May–September 2002
Swimming is the second most popular exercise activity inthe United States, with approximately 360 million annual visitsto recreational water venues (1). This exposure increases thepotential for the spread of recreational water illnesses (RWIs)(e.g., cryptosporidiosis, giardiasis, and shigellosis). Since the1980s, the number of reported RWI outbreaks has increasedsteadily (2). Local environmental health programs inspectpublic and semipublic pools periodically to determine com-pliance with local and state health regulations. Duringinspections for regulatory compliance, data pertaining to poolwater chemistry, filtration and recirculation systems, andmanagement and operations are collected. This report sum-marizes pool inspection data from databases at six sites acrossthe United States collected during May 1–September 1, 2002.The findings underscore the utility of these data for public-health decision making and the need for increased trainingand vigilance by pool operators to ensure high-quality swim-ming pool water for use by the public.
Data from 22,131 pool inspections were collected from theAllegheny County Department of Health, Pennsylvania(n = 713); the Florida Department of Health, Bureau ofWater Programs (n = 19,604); the Los Angeles CountyDepartment of Health Services, California (n = 1,606); theSt. Louis County Department of Public Health, Minnesota(n= 34); the City of St. Paul Office of License, Inspections,and Environmental Protection, St. Paul, Minnesota (n = 56);and the Wyoming Department of Agriculture (n = 118). Thesites selected were a convenience sample of pool inspectionprograms contacted that had computerized data available.Because of data incompatibilities, some inspections conductedat some sites might not have been part of the final analysis.The data were merged into a single SAS database,including date of inspection, pool type, water-chemistry data
(e.g., free chlorine and pH levels), filtration and recirculationsystem data (e.g., operating filters and approved water turn-over rates), and policy and management data (e.g., recordkeeping and pool operator training). A violation was notedwhen an inspection item was not in compliance with state orlocal swimming pool codes. Other inspection items (e.g., sup-port facilities and injury control) were not addressed in thisstudy.
A total of 21,561 violations of pool codes were documentedduring the 22,131 inspections; the majority (67.5%) occurredin pools for which no pool type (e.g., hotel/motel) was speci-fied (Table 1). Approximately one half (45.9%) of inspec-tions indicated no violations. The majority of inspections(54.1%) found one or more violations (median: one; range:one to 12), and 8.3% of inspections resulted in immediateclosure of the pool pending corrections of serious violationitems (e.g., lack of disinfectant). Of total violations, water-chemistry violations comprised 38.7%, followed by filtrationand recirculation system (38.6%), and policy and manage-ment (22.7%). For the 24.3% of inspections for which pooltype could be ascertained (typed inspections), a range of vio-lations occurred (Table 2). For typed inspections collectingfree chlorine data, 4.5%–18.4% reported violations. The high-est percentage (18.4%) of violations occurred in child wad-ing pools, medical/therapy pools (14.3%), and hotel/motel
514 MMWR June 6, 2003
SUGGESTED CITATIONCenters for Disease Control and Prevention. [ArticleTitle]. MMWR 2003;52:[inclusive page numbers].
Centers for Disease Control and Prevention
Julie L. Gerberding, M.D., M.P.H.Director
David W. Fleming, M.D.Deputy Director for Public Health Science
Dixie E. Snider, Jr., M.D., M.P.H.Associate Director for Science
Epidemiology Program Office
Stephen B. Thacker, M.D., M.Sc.Director
Office of Scientific and Health Communications
John W. Ward, M.D.Director
Mary Lou Lindegren, M.D.Acting Editor, MMWR Series
Suzanne M. Hewitt, M.P.A.Managing Editor, MMWR Series
David C. Johnson(Acting) Lead Technical Writer/Editor
Jude C. RutledgeTeresa F. Rutledge
Jeffrey D. Sokolow, M.A.Writers/Editors
Lynda G. CupellMalbea A. Heilman
Visual Information Specialists
Quang M. DoanErica R. Shaver
Information Technology Specialists
Division of Public Health Surveillanceand Informatics
Notifiable Disease Morbidity and 122 Cities Mortality DataRobert F. Fagan
Deborah A. AdamsFelicia J. ConnorLateka Dammond
Patsy A. HallPearl C. Sharp
The MMWR series of publications is published by theEpidemiology Program Office, Centers for Disease Controland Prevention (CDC), U.S. Department of Health andHuman Services, Atlanta, GA 30333.
pools (14.0%). In typed inspections, the percentage of totalviolations attributable to pH infractions ranged from 4.7%to 16.7%, with the highest percentage occurring in child wad-ing pools. For child wading pools, 8% had coincident freechlorine and pH violations. Filtration and recirculation sys-tem violations occurred in 34.0%–76.8% of typed inspec-tions, with municipal pools having the greatest percentage.In sites where training was required, inspections demonstratedthat many pool operators did not have appropriate certifica-tion (0–35.7%), with apartment/condominium complexeshaving the highest percentage of violations.Reported by: D Cinpinski, MPA, Allegheny County Dept of Health,Pittsburgh, Pennsylvania. B Bibler, Bur of Water Programs, Florida Deptof Health. R Kebabjian, MPH, Los Angeles County, Dept of HealthSvcs, Recreational Health Program, Los Angeles, California. R Georgesen,St. Louis County Dept of Public Health; P Kishel, City of St. Paul Officeof License, Inspections, and Environmental Protection, St. Paul,Minnesota. D Finkenbinder, MPA, N Bloomenrader, Wyoming Dept ofAgriculture. C Otto, MPA, Div of Emergency and Environmental HealthSvcs, National Center for Environmental Health; MJ Beach, PhD,J Roberts, MPH, L Mirel, MS, Div of Parasitic Diseases, National Centerfor Infectious Diseases; K Day, MPH, K Bauer, MS, Public HealthPrevention Svc, CDC.
Editorial Note: The increasing number of reported pool-associated outbreaks of gastroenteritis underscores the needfor proper pool maintenance as an important public healthintervention (1,2). Approximately one fourth of these out-breaks involved chlorine-sensitive pathogens (e.g., Escherichiacoli O157:H7 and Shigella spp.), which causally implicatesinadequate pool maintenance and disinfection. Pool inspec-tions are the primary means of ensuring appropriate pooloperation, but resources generally allow only one to threeannual inspections of each pool. As a result, pool operatorsare responsible for maintaining their pools with minimal pub-lic health oversight. This report documents the first attemptto analyze aggregated pool inspection data, which indicatethat although some pools are well-maintained, such an infre-quent inspection process cannot ensure compliance with stateand local pool regulations.
Proper pool maintenance requires a combination of goodwater quality, functioning filtration and recirculation equip-ment, and well-trained staff. In this study, several violationsthat could facilitate the spread of RWIs were documented,with 45.9% of inspections documenting no violations. Themajority of violations involved water-quality parameters (e.g.,free chlorine and pH levels) or filtration and recirculationsystem parameters.
The interaction of pH and free chlorine levels is critical indetermining the effectiveness of chlorine as a disinfectant, andeffective monitoring can ensure that the optimum free
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chlorine and pH levels are maintained to prevent infectiousdisease transmission. The coincident occurrence of pH andchlorine violations indicates a substantial lack of trainingamong pool operators, particularly those at apartment/condominium complexes. The number of overall violationshighlights the need for increased vigilance in ensuring poolstaff training, including information about RWI transmis-sion, and the potential benefits of mandating training for pooloperators throughout the United States. This poses a chal-lenge for some pool types (e.g., apartment/condominiumcomplexes and hotels/motels) because of high staff turnoveror part-time operators. Providing pool operators with moretargeted education, maintenance suggestions, and forms forsimple monitoring of free chlorine and pH levels mightimprove public health protection at these facilities.
Chlorine and pH violations were highest in wading pools,which are used by younger children, including those who weardiapers. Young children, who often swallow water indiscrimi-nately and have an increased chance of contaminating thepool water fecally, are at increased risk for severe illness ifinfected. In addition, the shallow depth and relatively lowvolume of water in these wading pools might lead to morerapid depletion of disinfectant by ultraviolet light and higherorganic contamination by the children. Wading pools requireincreased vigilance and testing to maintain safe disinfectantlevels. Pool operators need to be aware that every time theyhave inadequate disinfection in a pool, they increase therisk for spreading RWIs whenever an infected swimmercontaminates the pool.
The findings in this report aresubject to at least two limitations.First, database structures for eachsite differed, the types of data col-lected and entered varied, and thedata were not standardized acrossstates or counties, thereby reducingthe generalizability of the data. Sec-ond, because free chlorine levelswere not entered in the database,the percentage of violations causedby low chlorine levels could not beascertained and the range of chlo-rine levels recorded could not beanalyzed.
Although the lack of uniformdata collection among sites limitedthe analysis and usability of thedata, this report underscores thepotential usefulness of uniform col-lection of these data in a comput-erized format that can be analyzed
routinely and used for full evaluation of inspection programs.CDC and its partners are developing systems-based guidanceon pool operation and implementation of uniform methodsfor data collection and analysis. These data can then be usedin the training of inspectors and operators, planning andresource allocation, and documenting trends related toparticular regulatory changes and interventions.
Poor pool maintenance and operation, untrained pool staff,the potential presence of the chlorine-resistant pathogenCryptosporidium parvum (2,3), and a swimming public that isill-informed about the potential for spreading RWIs in thepool increase the complexity of any proposed prevention plan.Swimmer education should play a critical role in preventingthe spread of RWIs. Swimmers and home pool owners shouldbe informed that they should 1) not swim when ill with diar-rhea, 2) not swallow pool water, and 3) practice good hygienewhen using a pool (e.g., frequent restroom breaks, appropri-ate diaper changing, and hand washing). Additional infor-mation about reducing the spread of RWIs is available athttp://www.healthyswimming.org.References1. U.S. Bureau of the Census. Statistical abstract of the United States:
1995. 115th ed. Washington, DC: U.S. Bureau of the Census, 1995.2. Lee SH, Levy DA, Craun GF, Beach MJ, Calderon RL. Surveillance for
3. CDC. Protracted outbreaks of cryptosporidiosis associated with swim-ming pool use—Ohio and Nebraska, 2000. MMWR 2001;50:406–10.
TABLE 1. Number and percentage of pool inspections* having specific violations of stateand/or local health regulations, by type of violation and pool type — selected states andcounties, United States, May–September 2002
* Numbers reported are for those sites collecting data on the specified violation. Although 22,131 inspectionswere conducted, the number of inspections collecting data for each specific violation (denominator) variedwidely because of a lack of uniform data collection among sites. In addition, each aggregate variable mightinclude multiple violations and single pool inspections could have multiple violations. As a result, percentagetotals do not add to 100%.
†Range of inspections collecting violation data for each pool type (R) = 573–5,385.
§R = 140–16,746.
¶R = 713–22,131.
** Aggregate variable. A positive could include one or more violations in any area (e.g., cyanurate levels,algae, bacterial quality, disinfectant/pH chemical feeders, total alkalinity, and calcium hardness).
††Aggregate variable. A positive could include one or more violations in any area (e.g., backwash, crossconnections, filter, flow meter, pressure gauges, recirculation system, turnover, and turbidity).
Update: Influenza Activity — UnitedStates and Worldwide, 2002–03Season, and Composition of the
2003–04 Influenza VaccineIn collaboration with the World Health Organization
(WHO), its collaborating laboratories, state and local healthdepartments, health-care providers, and vital statistic regis-tries, CDC conducts surveillance to monitor influenza activ-ity and to detect antigenic changes in the circulating strains
of influenza viruses. During the 2002–03 influenza season,influenza A (H1)*, A (H3N2), and B viruses co-circulated inthe Northern Hemisphere. Human infections with avian in-fluenza A (H5N1) and A (H7N7) viruses were reported inHong Kong and the Netherlands, respectively. In the UnitedStates, the 2002–03 influenza season was mild; influenza A(H1) and B viruses circulated widely, and the predominantvirus varied by region and time of season. Thisreport summarizes influenza activity in the United States† and
* Includes both the A (H1N1) and A (H1N2) influenza virus subtypes.† As of May 22, 2003.
TABLE 2. (Continued) Number and percentage of pool inspections* having specific violations of state and/or local health regula-tions, by type of violation and pool type — selected states and counties, United States, May–September 2002
* Numbers reported are for those sites collecting data on the specified violation. Although a total of 5,385 inspections were conducted, the number ofinspections collecting data for each specific violation (denominator) varied widely because of a lack of uniform data collection among sites. In addition,each aggregate variable might include multiple violations, and single pool inspections could have multiple violations. As a result, percentages do notadd to 100%.
†Range of inspections collecting violation data for each pool type (R) = 51–878.
§R = 165–2,987.
¶R = 18–81.
** R = 168–476.††
R = 69–539.§§
R = 33–192.¶¶
R = 6–17.*** R = 45–112.†††
R = 2–103.§§§
R = 573–5,385.¶¶¶
Aggregate variable. A positive could include one or more violations in any area (e.g., cyanurate levels, algae, bacterial quality, disinfectant/pH chemicalfeeders, total alkalinity, and calcium hardness).
****Aggregate variable. A positive could include one or more violations in any area (e.g., backwash, cross connections, filter, flow meter, pressure gauges,recirculation system, turnover, and turbidity).
TABLE 2. Number and percentage of pool inspections* having specific violations of state and/or local health regulations, by type ofviolation and pool type — selected states and counties, United States, May–September 2002
Minnesota, Mississippi, North Dakota, South Dakota, Ten-
nessee, and Texas). During 2002, WNV seroconversions have
been reported in 52 sentinel chicken flocks from Florida,
Nebraska, and Pennsylvania; and 425 WNV-positive mos-
quito pools have been reported from 12 states (Alabama, Geor-
gia, Illinois, Indiana, Massachusetts, Mississippi, New Jersey,
Ohio, Pennsylvania, South Dakota, Texas, and Virginia), New
York City, and the District of Columbia.
West Nile Virus Activity — United States, July 31–August 7, 2002,
and Louisiana, January 1–August 7, 2002
INSIDE683
Outbreak of Salmonella Serotype Javiana Infections —
Orlando, Florida, June 2002
684Childhood Lead Poisoning Associated with Tamarind
Candy and Folk Remedies — California, 1999–2000
686Human Rabies — California, 2002
688Outbreak of Tularemia Among Commercially Distributed
Prairie Dogs, 2002
699Notices to Readers
Recent human WNV infection and animal WNV activity
Animal WNV activity only
District ofColumbia
* As of August 7, 2002.
FIGURE 1. Areas reporting West Nile virus (WNV) activity —
United States, 2002*
518 MMWR June 6, 2003
worldwide during the 2002–03 influenza season and describesthe composition of the 2003–04 influenza vaccine.
United StatesThe percentage of respiratory specimens testing positive for
influenza and the proportion of outpatient visits to physi-cians for influenza-like illness (ILI)§ began to increase in mid-January and peaked during early February. Both influenza A(H1) and B viruses circulated widely this season, with someregions reporting more influenza A viruses than influenza Bviruses and others reporting more B viruses than A viruses.Nationally, influenza B viruses predominated during the firsthalf of the season, but after the week ending February 1,influenza A viruses were reported more frequently thaninfluenza B viruses.
During September 29, 2002–May 17, 2003, the WHO andNational Respiratory and Enteric Virus Surveillance System(NREVSS) collaborating laboratories in the United Statestested 94,966 specimens for influenza viruses, of which 11,027(11.6%) were positive. Of these, 6,324 (57%) were influenzaA viruses, and 4,703 (43%) were influenza B viruses. Amongthe influenza A viruses, 3,381 (53%) were subtyped; of these,2,534 (75%) were influenza A (H1) viruses, and 847 (25%)were influenza A (H3N2) viruses. Influenza A viruses werereported more frequently (range: 58%–86%) than influenzaB viruses in the New England, East North Central, Pacific,Mountain, and Mid-Atlantic regions, and influenza B viruseswere reported more frequently (range: 53%–78%) thaninfluenza A viruses in the West North Central, West SouthCentral, South Atlantic, and East South Central regions. Theproportion of specimens testing positive for influenza firstincreased to >10% during the week ending January 18 (week3), peaked at 25% during the week ending February 8 (week6), and declined to <10% during the week ending April 5(week 14). The peak percentage of specimens testing positivefor influenza during the previous three seasons (1999–00,2000–01, and 2001–02) ranged from 23% to 31% (1; CDC,unpublished data, 2003).
CDC has antigenically characterized 626 influenza virusessubmitted by U.S. laboratories since September 29, 2002: 267influenza A (H1) viruses, 105 influenza A (H3N2) viruses,and 254 influenza B viruses. Of the 267 influenza A (H1)viruses, 193 (72%) had an N1 neuraminidase, 66 (25%) hadan N2 neuraminidase, and the neuraminidase typing for eight(3%) H1 viruses is pending. The hemagglutinin proteins ofall 267 influenza A (H1) viruses were similar antigenically tothe hemagglutinin of the vaccine strain A/New Caledonia/
20/99 (H1N1). Of the 105 influenza A (H3N2) isolates thathave been characterized, 98 (93%) were similar to A/Panama/2007/99, the H3N2 component of the 2002–03 influenzavaccine, and seven (7%) had reduced titers to ferret antiseraproduced against A/Panama/2007/99. Of the 254 influenzaB viruses that have been characterized, 253 (99%) belongedto the B/Victoria lineage and were similar antigenically to thevaccine strain B/Hong Kong/330/01, and one (1%) belongedto the B/Yamagata lineage and was similar to B/Shizuoka/15/01, a B/Sichuan/379/99-like virus.
During the week ending December 28, 2002 (week 52)and each consecutive week during the weeks ending January25–March 8, 2003 (weeks 4–10), the weekly percentage ofpatient visits for ILI to U.S. sentinel providers exceededbaseline levels (0–1.9%)¶. The peak percentage of patient visitsfor ILI was 3.2% during the week ending February 8 (week6). During the previous three seasons (1999–00, 2000–01,and 2001–02), the peak percentage of patient visits for ILIranged from 3.2% to 5.7% (1; CDC, unpublished data,2003).
On the basis of data reported by state and territorial epide-miologists, influenza activity peaked during the week endingFebruary 22 (week 8), when 35 states reported regional orwidespread influenza activity**. One or more states reportedregional influenza activity each week during the weeks end-ing October 26, 2002–May 17, 2003. Widespread influenzaactivity was reported by one or more states for the weeks end-ing December 7–21, 2002 (weeks 49–51), and for all but 1week during the weeks ending January 18–April 19, 2003(weeks 3–16). The peak number of states reporting widespreador regional activity during the previous three seasons rangedfrom 38 to 44 states.
As measured by the 122 Cities Mortality Reporting Sys-tem, the percentage of deaths in the United States attributedto pneumonia and influenza (P&I) did not exceed the epi-demic threshold†† during the 2002–03 season. During the
§ Defined as temperature of >100º F (>37.8º C) and either cough or sore throatin the absence of a known cause other than influenza.
¶ The national baseline was calculated as the mean percentage of patient visitsfor ILI during noninfluenza weeks plus two standard deviations. Anoninfluenza week is a week during which <10% of specimens tested positivefor influenza. Wide variability in regional data precludes calculating region-specific baselines and makes it inappropriate to apply the national baselineto regional data.
** Levels of activity are 1) no activity, 2) sporadic—sporadically occurring ILIor laboratory-confirmed influenza with no outbreaks detected, 3) regional—outbreaks of ILI or laboratory-confirmed influenza in counties with acombined population of <50% of a state’s total population, and 4)widespread—outbreaks of ILI or laboratory-confirmed influenza in countieswith a combined population of >50% of a state’s total population.
†† The expected seasonal baseline proportion of P&I deaths reported by the122 Cities Mortality Reporting System is projected by using a robustregression procedure in which a periodic regression model is applied to theobserved percentage of deaths from P&I during the previous 5 years. Theepidemic threshold is 1.654 standard deviations above the seasonal baseline (1).
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previous three seasons, the number of consecutive weeks dur-ing which the percentage of deaths attributed to P&I exceededthe epidemic threshold ranged from 0 to13 weeks.
WorldwideDuring October 2002–May 2003, influenza A and B
viruses co-circulated in Asia, Europe, and North America. InEurope and Asia, the majority of influenza A viruses subtypedwere A (H3N2), but A (H1) was the most frequently reportedinfluenza A subtype in North America. Within countries orregions, the predominant virus type or subtype varied andchanged frequently as the season progressed.
In Europe, influenza A (H3N2) viruses predominated inthe Czech Republic, Germany, Italy, the Netherlands, Poland,Russia, and Switzerland; in Asia, these viruses predominatedin Japan, Hong Kong, and the Republic of Korea. InfluenzaA (H3N2) viruses also were reported in Africa (Egypt, Mada-gascar, Senegal, and Tunisia), other countries in Asia (China,Guam, India, Israel, Malaysia, the Philippines, Singapore,Thailand, and Turkey), other countries in Europe (Bulgaria,France, Norway, Portugal, Romania, and Slovakia), LatinAmerica (Argentina, Brazil, French Guiana, Mexico, andPeru), and Oceania (Australia).
Influenza A (H1) viruses predominated in Canada andMexico. In the United States, influenza A (H1) and B viruseswere reported at approximately the same frequency. InfluenzaA (H1) viruses also were reported in Africa (Senegal), Asia(China, Hong Kong, and Israel), Europe (the Czech Repub-lic, France, Italy, the Netherlands, Norway, Poland, Russia,Slovakia, Spain, and Switzerland), and Latin America(Argentina, Brazil, and Peru). Countries reporting unsubtypedinfluenza A viruses include Belgium, Chile, Lithuania, andSlovenia.
Influenza B viruses predominated in Belgium, the UnitedKingdom, France, Portugal, Romania, and Spain. InfluenzaB viruses also were reported in Africa (Egypt, Madagascar,Morocco, and Tunisia), Asia (India, China, Guam, Japan,Hong Kong, Israel, the Philippines, Thailand, and Taiwan),Europe (the Czech Republic, Germany, Italy, the Netherlands,Norway, Poland, Russia, Slovakia, Slovenia, and Switzerland)and Latin America (Argentina, Brazil, Chile, French Guiana,Mexico, and Peru).
In February 2003, two human infections with avian influ-enza A (H5N1) virus were confirmed in a family of HongKong residents who had traveled recently to Fujian Provincein mainland China (2). The first patient, a boy aged 9 years,
was hospitalized in Hong Kong and recovered; the secondpatient, the boy’s father, died in a Hong Kong hospital onFebruary 17. Other family members had respiratory symp-toms, and the boy’s sister, aged 8 years, died while the familywas in mainland China. The cause of her death and of theother respiratory illnesses in the family is not known. As ofJune 4, 2003, no additional human cases of influenza A(H5N1) infection had been identified in Hong Kong orelsewhere.
Since the end of February 2003, the Netherlands hasreported outbreaks of highly pathogenic avian influenza A(H7N7) in poultry on several farms. Subsequently, H7N7infections have been reported among pigs and humans in theNetherlands and among birds in Belgium and Germany. Asof April 25, the National Influenza Center in the Nether-lands had confirmed 83 cases of H7N7 influenza virus infec-tions among poultry workers and their families since the endof February 2003; 79 had conjunctivitis, but six also reportedILI symptoms (e.g., fever, cough, and muscle aches). Oneperson reported only ILI, and two persons reported mild ill-ness that could not be classified as ILI or conjunctivitis. Aveterinarian aged 57 years who visited one of the affected farmsin early April died on April 17 of acute respiratory distresssyndrome and complications related to H7N7 infection.Dutch authorities reported that transmission of H7N7 influ-enza from two poultry workers to three family members pos-sibly occurred. All three family members had conjunctivitis,and one also had ILI.
Composition of the 2003–04 InfluenzaVaccine
The Food and Drug Administration’s Vaccines and RelatedBiological Products Advisory Committee (VRBPAC) recom-mended that the 2003–04 trivalent influenza vaccine for theUnited States contain A/New Caledonia/20/99-like (H1N1),A/Moscow/10/99-like (H3N2), and B/Hong Kong/330/01-like viruses. This recommendation was based on antigenicanalyses of recently isolated influenza viruses, epidemiologicdata, and postvaccination serologic studies in humans.
The hemagglutinin proteins of the majority of influenza A(H1N1) and A (H1N2) viruses isolated worldwide were simi-lar to A/New Caledonia/20/99 (H1N1). Antibodies producedfollowing vaccination with the 2002–03 vaccine containingA/New Caledonia/20/99 (H1N1) virus reacted equally wellwith recent influenza A (H1N1) and A (H1N2) viruses andthe vaccine strain (3).
520 MMWR June 6, 2003
The majority of influenza A (H3N2) viruses isolated dur-ing the 2002–03 season were similar to A/Panama/2007/99and A/Moscow/10/99-like (H3N2) viruses. A small numberof influenza A (H3N2) viruses had reduced titers to ferretantisera produced against A/Panama/2007/99 (H3N2)-likeviruses. Because the majority of viruses were similar to A/Panama/2007/99, an influenza A/Moscow/10/99-like(H3N2) virus was retained in the 2003–04 vaccine. Becauseof its growth properties, U.S. vaccine manufacturers will usean antigenically equivalent virus, A/Panama/2007/99, as theinfluenza A component (4).
The majority of influenza B isolates worldwide were fromthe B/Victoria/2/87 lineage and were similar to the 2002–03vaccine strain, B/Hong Kong/330/01. U.S. manufacturers willuse either B/Hong Kong/330/01 or the antigenically equiva-lent virus, B/Hong Kong/1434/02, in the 2003–04 vaccine.Reported by: WHO Collaborating Center for Surveillance,Epidemiology, and Control of Influenza. L Brammer, MPH, A Postema,MPH, S Harper, MD, A Klimov, PhD, K Fukuda, MD, N Cox, PhD,Div of Viral and Rickettsial Diseases, National Center for InfectiousDiseases, CDC.
Editorial Note: Overall, the 2002–03 influenza season wasmild, and the predominant virus type/subtype varied by re-gion in the United States and in Europe. In many areas, thepredominant circulating virus type changed within a regionor country as the season progressed. For example, influenza Bviruses predominated in the United States during October–January, but after January, influenza A viruses were identifiedmore frequently.
Human infections with avian influenza viruses A (H5N1)and A (H7N7) were reported during 2002–03 influenza sea-son in Hong Kong and the Netherlands, respectively. Theseare the first human infections with avian influenza virusesreported since 1999, when two children were infected withinfluenza A (H9N2) in Hong Kong (5), and the first humaninfluenza A (H5N1) infections reported since 1997 (6,7).Since 1997, influenza A (H5N1) virus has been detectedperiodically in chickens and ducks, and more recently, in wildbirds in Hong Kong. Human H7N7 infections were associ-ated previously with conjunctivitis (8,9), but the cases in theNetherlands are the first virologically confirmed respiratoryinfections with this virus subtype and include the firstrecorded human fatality associated with this virus.
Transmission of avian influenza viruses directly from ani-mals to humans is unusual. Humans typically have little orno antibody protection against these viruses. If an avian orother animal influenza virus infected humans and spreadefficiently from person to person, an influenza pandemic couldresult.
As a result of the human A (H5N1) infections, in February2003, CDC issued recommendations for enhanced influenzasurveillance for state health departments (http://www.cdc.gov/ncidod/diseases/flu/hanH5N1.htm). Recommendations forenhanced influenza surveillance include 1) year-round labo-ratory testing for influenza and sentinel provider surveillancefor ILI; 2) subtyping of all influenza A viruses identified byU.S. WHO/NREVSS collaborating laboratories; and 3)strengthening of sentinel provider surveillance in states with<75% of their sentinel provider goal (i.e., one regularly re-porting site per 250,000 population, or a minimum of 10sites in smaller, less populous states).
Considerable overlap exists between the clinical presenta-tion and travel history of persons who might have severe acuterespiratory syndrome (SARS) and those who should be evalu-ated for infection with influenza A (H5N1). Influenza A in-fection should be considered in the differential diagnosis alongwith SARS when evaluating patients with febrile respiratoryillness. Priority should be given to subtyping influenza A vi-ruses isolated from potential SARS patients with recent travelto Asia and the contacts of such persons. Any influenza vi-ruses that cannot be subtyped should be reported immedi-ately to CDC.
Influenza vaccine manufacturers project that approximately80–85 million doses of influenza vaccine will be available fordistribution during the 2003–04 season, approximately 10–15 million doses below last year’s production level, but morethan the estimated total number of doses sold in 2002. Thisprojection could change as the season progresses.
AcknowledgmentsThis report is based on data contributed by participating state
and territorial epidemiologists and state public health laboratorydirectors, World Health Organization collaborating laboratories,National Respiratory and Enteric Virus Surveillance Systemcollaborating laboratories, U.S. Influenza Sentinel ProviderSurveillance System. WHO National Influenza Centers,Communicable Diseases, Surveillance and Response, Geneva,Switzerland. A Hay, PhD, WHO Collaborating Center for Referenceand Research on Influenza, National Institute for Medical Research,London, England. I Gust, MD, A Hampson, WHO CollaboratingCenter for Reference and Research on Influenza, Parkville, Australia.M Tashiro, MD, WHO Collaborating Center for Reference andResearch on Influenza, National Institute of Infectious Diseases,Tokyo, Japan. R Fouchier, PhD, T Kuiken, DVM, A Osterhaus,DVM, Dept of Virology, Erasmus Medical Center, Rotterdam, theNetherlands. JSM Peiris, DPhil, Depts of Microbiology andPathology, Queen Mary Hospital, Univ of Hong Kong, Hong KongSpecial Administrative Region (SAR). W Lim, FRCPA, GovernmentVirus Unit, Dept of Health, Hong Kong SAR. Div of Public HealthSurveillance and Informatics, Epidemiology Program Office, CDC.
3. World Health Organization. Recommended composition of influenzavirus vaccines for use in the 2003–2004 influenza season. WklyEpidemiol Rec 2002;78:58–62.
4. World Health Organization. Addendum to the recommended compo-sition of influenza virus vaccines for use in the 2003–2004 influenzaseason. Wkly Epidemiol Rec 2002;78:77.
5. CDC. Update: influenza activity—United States and worldwide, 1998–99 season, and composition of the 1999–2000 influenza vaccine.MMWR 1999;48:374–8.
6. Buxton Bridges C, Katz JM, Seto WH, et al. Risk of influenza A (H5N1)infection among health care workers exposed to patients with influenzaA (H5N1), Hong Kong. J Infect Dis 2000;181:344–8.
7. Mounts AW, Kwong H, Izurieta HS, et al. Case-control study of riskfactors for avian influenza A (H5N1) disease, Hong Kong, 1997.J Infect Dis 1999;180:505–8.
8. Kurtz J, Manvell RJ, Banks J. Avian influenza virus isolated from awoman with conjunctivitis. Lancet 1996;348:901–2.
9. Webster RG, Geraci J, Petursson G, Skirnisson K. Conjunctivitis inhuman beings caused by influenza A virus of seals. N Engl J Med1981;304:911.
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2001–March 2003Since the 1988 World Health Assembly resolution to eradi-
cate poliomyelitis globally, substantial progress has been madein all World Health Organization (WHO) regions, and threeregions (Americas, European, and Western Pacific) are classi-fied as polio-free (1,2). The African Region comprises fourepidemiologic blocks (Central, Eastern, Southern, and West-ern). The Southern African block comprises 14 countries —10 on the mainland (Angola, Botswana, Lesotho, Malawi,Mozambique, Namibia, South Africa, Swaziland, Zambia, andZimbabwe) and four in the Indian Ocean (Comoros, Mada-gascar, Mauritius, and Seychelles) — with a combined totalpopulation in 2002 of approximately 120 million persons.This report summarizes polio eradication efforts in the South-ern African block during January 2001–March 2003, whichindicate the possible interruption of wild poliovirus (WPV)transmission and underscore the need to sustainpolio eradication efforts.
522 MMWR June 6, 2003
Routine VaccinationDuring 2001, coverage with 3 doses of oral poliovirus vac-
cine (OPV) was estimated at >90% in two countries(Mauritius and Seychelles), at 80%–89% in four countries(Botswana, Lesotho, Malawi, and South Africa), and at 70%–79% in five countries (Comoros, Mozambique, Swaziland,Zambia, and Zimbabwe). Coverage was lowest (<70%) inthree countries: Namibia (64%), Madagascar (58%), andAngola (44%) (3).
Supplementary Immunization ActivitiesDuring 1996–2000, all countries in the Southern African
block conducted supplementary immunization activities(SIAs) with OPV during >2 years (Table 1). SIAs consisted oftwo rounds of National Immunization Days (NIDs)* in thewinter (May–September), targeting children aged <59 months.Angola, Namibia, and Zambia continued annual NIDsthrough 2002 because of WPV transmission in Angola andcross-border transmission in western Zambia. After havingdiscontinued NIDs for 3 years, Madagascar resumed conduct-ing NIDs in 2002 after a polio outbreak caused by circulat-ing vaccine-derived poliovirus (cVDPV).
During 2001–2002, SIA quality improved substantiallythrough more detailed microplanning (i.e., planning at thedistrict level), house-to-house vaccination, intensified super-vision of house-to-house vaccination teams, and separate tal-lying of children who never had received OPV. During thefirst round of NIDs in Madagascar in September 2002, ofthe approximately 3.7 million children aged <5 years whowere vaccinated, approximately 492,000 (15%) never had
received OPV. Analysis of the distribution of these childrenenabled the Ministry of Health to determine which geographicareas to focus on to improve routine vaccination. In 2002,SIAs were coordinated among countries inside and outsidethe Southern African block, and NIDs in Angola and Namibiawere synchronized with SIAs in the Democratic Republic ofCongo and selected countries of the Central African block.Angola plans to conduct additional NIDs in June and August2003.
Incidence of PolioCountries of the Southern African block with the most
recent isolation of WPV from acute flaccid paralysis (AFP)cases include Zambia (2002, two cases imported from Angola),Angola (2001, one case), Madagascar (1997, one case), andNamibia (1995, at least eight cases) (Tables 1 and 2). In theother countries of the Southern African block, WPV was lastisolated in 1993 or earlier. In Madagascar, a polio outbreakrelated to cVDPV during 2001–2002 was detected andcontrolled after NIDs were conducted during September–October 2002 (4).
AFP SurveillanceThe goal of AFP surveillance is to detect circulating polio-
viruses and provide data for developing appropriate supple-mentary vaccination strategies. AFP surveillance quality isevaluated by two key indicators: sensitivity of reporting (tar-get: nonpolio AFP rate of >1 case per 100,000 children aged<15 years) and completeness of specimen collection (target:two adequate stool specimens† from >80% of persons with
TABLE 1. Year of last identified poliovirus and years in which supplemental immunization activities (SIAs) were conducted, bycountry — 11 countries, Southern Africa, 1996–2002
Lastidentified SIAs conducted
Country poliovirus 1996 1997 1998 1999 2000 2001 2002
Angola 2001 x x x x x x xBotswana 1989 x x x xLesotho 1987 x x xMadagascar 2002* x x x xMalawi 1991 x x x x xMozambique 1993 x x x xNamibia 1995 x x x x x x xSouth Africa 1989 x x x xSwaziland 1989 x xZambia 2002† x x x x x x xZimbabwe 1991 x x
Importation from Angola (last identified indigenous wild poliovirus in 1995).
* Nationwide mass campaigns during a short period (days to weeks) in which 2doses of OPV are administered to all children (usually aged <5 years), regardlessof previous vaccination history, with an interval of 4–6 weeks between doses.
† Two stool specimens collected at an interval of at least 24 hours apart, within14 days of onset of paralysis, and adequately shipped to the laboratory.
Vol. 52 / No. 22 MMWR 523
AFP). All countries of the Southern African block exceptMadagascar and Mozambique have achieved a level of AFPsurveillance that allows use of virologic case classification cri-teria (i.e., annual adequate specimens collected from >60%of persons with AFP) (5). Madagascar, Mozambique, Namibia,and South Africa have not yet achieved certification-qualityAFP surveillance (adequate specimens from >80% of personswith AFP) in any year (Table 2). Analysis of AFP performanceindicators at the subnational level indicates considerable sur-veillance deficiencies at the provincial and district level. Dur-ing January–March 2003, surveillance performance inSouthern African block countries continued to improve,especially in Botswana, Mozambique, South Africa, andSwaziland. Performance decreased substantially in Angola(Table 2).
Regional Laboratory NetworkThe polio laboratory network in the Southern African block
consists of four laboratories: one each in Madagascar, Zam-bia (which also serves Tanzania), Zimbabwe (which also servesMalawi), and South Africa (a regional reference laboratorythat serves the remaining countries in the block and coun-tries in other blocks). During 2002, network laboratories pro-cessed 2,114 samples from 1,088 persons with AFP withparalysis onset (South Africa, 571 cases; Zambia, 277 cases[including 144 samples from Tanzania]; Zimbabwe, 182 cases;and Madagascar, 58 cases). The nonpolio enterovirus (NPEV)
isolation rate (target: >10% of stool specimens with NPEVisolation) serves as a combined indicator of specimen quality(i.e., quality of the reverse cold chain for specimen transport)and laboratory sensitivity. For the eight countries that reportedan NPEV isolation rate, the rate ranged from 0 to 44%.Angola, Botswana, Mozambique, Namibia, and South Africaall reported NPEV isolation rates of >10%.
Certification and Laboratory Containmentof Poliovirus
All countries in the Southern African block except Namibiahave established National Polio Expert Committees (NPECs)comprising experts who make the final classification of AFPcases as confirmed polio, polio-compatible, or nonpolio AFP.All countries have National Committees for the Certificationof Polio Eradication (NCCs) comprising independent expertswho work closely with the African Regional CertificationCommission (ARCC) to achieve the eventual polio-free cer-tification of the region. Although NPECs exist in the major-ity of countries of the Southern African block, delays in AFPcase classification have occurred, with large numbers of AFPcases pending final classification for approximately 6 months;as of December 2002, a total of 283 persons with AFP withparalysis onset during 2002 had not been classified. In 2002,a total of 13 AFP cases were classified as polio-compatible(nine from Angola and four from South Africa). No clustersof polio-compatible cases were found.
TABLE 2. Number of confirmed wild poliovirus (WPV) cases and key surveillance indicators, by country — 11 countries, SouthernAfrica, January 2001–March 2003*
Two stool specimens collected at an interval of at least 24 hours apart, within 14 days of onset of paralysis, and adequately shipped to the laboratory.** One AFP case with circulating vaccine-derived poliovirus (cVDPV) was detected.††
Four AFP cases with cVDPV were detected.
524 MMWR June 6, 2003
NCCs in all Southern African block countries have begunto submit annual country progress reports on polio eradica-tion to the ARCC. After >3 years of certification-quality AFPsurveillance without detecting WPV, Malawi is one of thefirst eight countries in the African Region selected by ARCCto begin submitting final national documentationtoward eventual certification in 2003. Efforts toward the even-tual laboratory containment of WPVs also have begun, withthe designation of national task forces (NTFs) for laboratorycontainment in Angola, Botswana, Madagascar, Malawi,Namibia, South Africa, Swaziland, and Zimbabwe. Lesothoand Zambia are in the process of establishing NTFs.Reported by: Inter-Country Program Office, World HealthOrganization; Regional Office for Africa, World Health Organization,Harare, Zimbabwe. Vaccines and Biologicals Dept, World HealthOrganization, Geneva, Switzerland. Div of Viral and RickettsialDiseases, National Center for Infectious Diseases; Global ImmunizationDiv, National Immunization Program, CDC.
Editorial Note. The last reported cases of polio confirmedwith isolation of WPV in the Southern African block wereobserved in Zambia in February 2002. During January 2001–March 2003, WPV was isolated only in Angola and Zambia,and AFP surveillance quality improved in several countries,most notably in Angola, which had faced enormous challengesbecause of war (6). However, the decline in surveillance per-formance in Angola during January–March 2003 demon-strates the fragile nature of surveillance in this country, andsteps have been taken to ensure that surveillance quality willrebound rapidly.
Although transmission of indigenous WPV in the South-ern African block might have been interrupted, the possibil-ity of ongoing transmission of WPV in the Southern Africanblock cannot be excluded despite improved AFP surveillancein several countries (particularly Madagascar, Mozambique,and South Africa) and the absence of reports of AFP cases inmany areas (particularly in eastern Angola).
AFP surveillance quality in all countries of the SouthernAfrican block should be improved to ensure that inadequateAFP surveillance does not delay eradication and the eventualpolio-free certification of the African Region. During 2002,an external surveillance review, an important tool to assessboth the organization and performance of surveillance, wasconducted in Angola, and reviews are planned in 2003 for
Madagascar, Mozambique, and South Africa. In addition, thecountry technical advisory group for Angola will convene inJune to review the polio eradication initiative in this country,monitor the implementation of the recommendations result-ing from the 2002 surveillance review, and offer advice onfurther strengthening of surveillance and the need for SIAs(7).
The formation of functional NPECs and NCCs in themajority of countries indicates that progress is being madetoward achieving certification. However, further political com-mitment to accelerate the implementation of key polio-eradication strategies, including all aspects of AFP surveillance,is needed in all countries in the Southern African block, par-ticularly those that have not yet achieved certification-qualitysurveillance.
Support for the polio eradication initiative in SouthernAfrica has been provided primarily by WHO member states,the Netherlands, the United States, the United Kingdom,Rotary International, and CDC. For polio eradication activi-ties in these countries to be sustained until global certifica-tion is achieved, additional funding will be required. Throughnational Expanded Program on Immunization InteragencyCoordination Committees, polio eradication partners shouldexplore opportunities to raise funds from government andlocal partner agencies to support some activities. Strengthen-ing polio eradication strategies in Southern Africa will pre-vent importation and circulation of polioviruses until globalpolio eradication is certified.References1. World Health Assembly. Global eradication of poliomyelitis by the year
2000: resolution of the 41st World Health Assembly. Geneva, Switzer-land: World Health Organization, 1988 (Resolution no. WHA 41.28).
2. CDC. Progress toward global eradication of poliomyelitis, 2002.MMWR 2003;52:366–9.
3. World Health Organization. WHO vaccine-preventable disease: moni-toring system, 2002 global summary. Geneva, Switzerland: World HealthOrganization, 2002 (WHO document no. WHO/V&B/02.20).
4. CDC. Poliomyelitis—Madagascar, 2002. MMWR 2002;51:622.5. World Health Organization. Acute flaccid paralysis surveillance: the
surveillance strategy for poliomyelitis eradication. Wkly Epidemiol Rec1998;73:113–4.
7. World Health Organization. Report of the seventh meeting of the Tech-nical Consultative Group (TCG) on the Global Eradication of Polio-myelitis. Geneva, Switzerland: World Health Organization, 2002.
Vol. 52 / No. 22 MMWR 525
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Update: Severe Acute RespiratorySyndrome — United States,
June 4, 2003CDC continues to work with state and local health depart-
ments, the World Health Organization (WHO), and otherpartners to investigate cases of severe acute respiratory syn-drome (SARS). This report updates SARS cases reportedworldwide and in the United States and summarizes changesin CDC’s recommendations for travel to Singapore and HongKong and the resulting modification to the interim U.S. casedefinition for SARS.
During November 1, 2002–June 4, 2003, a total of 8,402SARS cases were reported to WHO from 29 countries,including the United States; 772 deaths (case-fatality propor-tion: 9.2%) have been reported (1). A total of 373 SARS casesidentified in the United States have been reported from 41states and Puerto Rico, with 306 (82%) cases classified assuspect SARS and 67 (18%) classified as probable SARS (i.e.,more severe illnesses characterized by the presence of pneu-monia or acute respiratory distress syndrome) (2). One prob-able and nine suspect cases have been identified since theprevious update (3). No SARS-related deaths have beenreported in the United States. Of the 67 probable cases, 65(97%) were attributed to international travel to areas withdocumented or suspected community transmission of SARSwithin the 10 days before illness onset; the remaining two(3%) probable cases occurred in a health-care worker whoprovided care to a SARS patient and a household contact of aSARS patient. Since the previous update (3), the number ofcases with laboratory-confirmed infection with SARS-associated coronavirus (SARS-CoV) remains at seven; all areprobable SARS cases, with no suspect SARS cases havinglaboratory evidence of infection with SARS-CoV.
CDC has downgraded the traveler notification for HongKong from a travel advisory to a travel alert (4,5). This changeis based on surveillance data from Hong Kong indicating thatthe symptoms onset date of the last reported patient withouta known source of exposure occurred on April 30, 2003, andthat more than 20 days, or two SARS incubation periods,have elapsed since that date. Persons who report travel to HongKong will continue to meet the surveillance case definition ifillness onset occurs within 10 days of travel.
The travel alert for Singapore was removed on June 4because 30 days (three maximum incubation periods) had
526 MMWR June 6, 2003
elapsed after the date of onset of symptoms for the last case(6). As a result, the epidemiologic criteria for travel exposurein the interim U.S. case definition have been revised. Illnessin persons reporting travel to Singapore will be consistentwith the surveillance case definition if onset occurred within10 days (one maximum incubation period) after removal ofthe travel alert. This revision to the case definition is forsurveillance purposes only. Clinical judgment, rather thansurveillance criteria, should continue to guide the manage-ment of patients and implementation of public health responsemeasures when persons with an unknown respiratory illnessare identified.Reported by: State and local health departments. SARS InvestigativeTeam, CDC.
References1. World Health Organization. Cumulative number of reported cases of
severe acute respiratory syndrome (SARS). Available at http://www.who.int/csr/sarscountry/2003_06_04/en.
2. CDC. Updated interim U.S. case definition of severe acute respiratorysyndrome (SARS). Available at http://www.cdc.gov/ncidod/sars/casedefinition.htm.
3. CDC. Update: severe acute respiratory syndrome—United States, 2003.MMWR 2003;52:500–1.
4. CDC. Interim definitions and criteria: travel alerts vs. travel advisories.Available at http://www.cdc.gov/ncidod/sars/travel_alertadvisory.htm.
5. CDC. Interim travel alert: Hong Kong. Available at http://www.cdc.gov/travel/other/sarshongkong.htm.
6. CDC. Travel alert removal: Singapore. Available at http://www.cdc.gov/travel/other/sarssingapore.htm.
Erratum: Vol. 52, No. RR-8In the MMWR Recommendations and Reports, “Prevention
and Control of Influenza: Recommendations of the AdvisoryCommittee on Immunization Practices (ACIP),” publishedApril 25, 2003, on page 12, an error occurred in the title forTable 3. The title should read, “Influenza vaccine* dosage byage group — United States, 2003–04 season.”
* Ratio of current 4-week total to mean of 15 4-week totals (from previous, comparable, and subsequent 4-week periods for the past 5 years). The point where the hatched area beginsis based on the mean and two standard deviations of these 4-week totals.
FIGURE I. Selected notifiable disease reports, United States, comparison of provisional 4-week totals May 31, 2003, with historicaldata
-: No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).†
Not notifiable in all states.§
Updated monthly from reports to the Division of HIV/AIDS Prevention — Surveillance and Epidemiology, National Center for HIV, STD, and TB Prevention(NCHSTP). Last update May 25, 2003.
¶Of 17 cases reported, 16 were indigenous and one was imported from another country.
** Of seven cases reported, four were indigenous and three were imported from another country.
TABLE I. Summary of provisional cases of selected notifiable diseases, United States, cumulative, week ending May 31, 2003 (22nd Week)*
Cum. Cum. Cum. Cum.2003 2002 2003 2002
528 MMWR June 6, 2003
UNITED STATES 19,482 16,491 331,936 340,708 1,308 1,809 729 871 - -
Guam 2 1 - - - - - - - -P.R. 514 502 483 1,254 N N N N - -V.I. 15 53 - 81 - - - - - -Amer. Samoa U U U U U U U U U UC.N.M.I. 2 U - U - U - U - U
N: Not notifiable. U: Unavailable. -: No reported cases. C.N.M.I.: Commonwealth of Northern Mariana Islands.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).† Chlamydia refers to genital infections caused by C. trachomatis.§ Updated monthly from reports to the Division of HIV/AIDS Prevention — Surveillance and Epidemiology, National Center for HIV, STD, and TB Prevention. Last update
May 25, 2003.
TABLE II. Provisional cases of selected notifiable diseases, United States, weeks ending May 31, 2003, and June 1, 2002(22nd Week)*
Encephalitis/MeningitisAIDS Chlamydia† Coccidiodomycosis Cryptosporidiosis West Nile
Guam N N - - - - - - - -P.R. - 1 - - - - 10 7 44 200V.I. - - - - - - - - - 19Amer. Samoa U U U U U U U U U UC.N.M.I. - U - U - U - U - U
N: Not notifiable. U: Unavailable. - : No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31, 2003, and June 1, 2002(22nd Week)*
Guam - - - - - - - - - -P.R. - - - - - - - - 9 92V.I. - - - - - - - - - -Amer. Samoa U U U U U U U U U UC.N.M.I. - U - U - U - U - UN: Not notifiable. U: Unavailable. -: No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31, 2003, and June 1, 2002(22nd Week)*
Haemophilus influenzae, invasive Hepatitis
All ages Age <5 years (viral, acute), by type
All serotypes Serotype B Non-serotype B Unknown serotype ACum. Cum. Cum. Cum. Cum. Cum. Cum. Cum. Cum. Cum.
Guam - - - - - - - - - -P.R. 13 68 - - - - - 2 N NV.I. - - - - - - - - - -Amer. Samoa U U U U U U U U U UC.N.M.I. - U - U - U - U - UN: Not notifiable. U: Unavailable. -: No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31, 2003, and June 1, 2002(22nd Week)*
Hepatitis (viral, acute), by typeB C Legionellosis Listeriosis Lyme disease
Guam - - - - - - - - - -P.R. - 1 2 2 - 2 20 33 N NV.I. - - - - - - - - - -Amer. Samoa U U U U U U U U U UC.N.M.I. - U - U - U - U - U
N: Not notifiable. U: Unavailable. - : No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31, 2003, and June 1, 2002(22nd Week)*
PACIFIC 1,748 1,767 865 763 276 261 1 - - -Wash. 186 147 69 41 23 8 - - N NOreg. 161 143 38 36 N N N N N NCalif. 1,321 1,352 752 664 225 227 N N N NAlaska 38 26 4 2 - - - - N NHawaii 42 99 2 20 28 26 1 - - -
Guam - - - - - - - - - -P.R. 47 144 1 11 N N N N N NV.I. - - - - - - - - - -Amer. Samoa U U U U U U U U U UC.N.M.I. - U - U - U - U - U
N: Not notifiable. U: Unavailable. - : No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31 , 2003, and June 1, 2002(22nd Week)*
Streptococcus pneumoniae, invasiveStreptococcal disease, Drug resistant,
Salmonellosis Shigellosis invasive, group A all ages Age <5 yearsCum. Cum. Cum. Cum. Cum. Cum. Cum. Cum. Cum. Cum.
Guam - - - - - - - - -P.R. 65 98 1 14 - 33 - - 115V.I. - 1 - - - - - - -Amer. Samoa U U U U U U U U UC.N.M.I. - U - U - U - U -
N: Not notifiable. U: Unavailable. - : No reported cases.* Incidence data for reporting years 2002 and 2003 are provisional and cumulative (year-to-date).
TABLE II. (Continued) Provisional cases of selected notifiable diseases, United States, weeks ending May 31 , 2003, and June 1, 2002(22nd Week)*
U: Unavailable. -:No reported cases.* Mortality data in this table are voluntarily reported from 122 cities in the United States, most of which have populations of >100,000. A death is reported by the place of its
occurrence and by the week that the death certificate was filed. Fetal deaths are not included.† Pneumonia and influenza.§ Because of changes in reporting methods in this Pennsylvania city, these numbers are partial counts for the current week. Complete counts will be available in 4 to 6 weeks.¶ Total includes unknown ages.
TABLE III. Deaths in 122 U.S. cities,* week ending May 31, 2003 (22nd Week)All causes, by age (years) All causes, by age (years)
All P&I† All P&I†
Reporting Area Ages >65 45-64 25-44 1-24 <1 Total Reporting Area Ages >65 45-64 25-44 1-24 <1 Total
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