RESPIRATORY VIRUS SURVEILLANCE REPORT
Wisconsin Department of Health Services | Division of Public Health
Bureau of Communicable Diseases | Communicable Diseases Epidemiology Section
www.dhs.wisconsin.gov/dph/bcd.htm | [email protected]
Week 14, Ending April 4, 2020
P-02346
Page 2
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
STATE OF WISCONSIN REGION V OF US
(WI, MN, IL, MI, OH, IN)
UNITED STATES
ILI: BELOW BASELINE ILI: HIGH LEVELS ILI: MODERATE LEVELS
INFLUENZA-ASSOCIATED
PEDIATRIC DEATHS REPORTED:
INFLUENZA LIKE ILLNESS (ILI) ACTIVITY
For National US influenza surveillance statistics visit: www.cdc.gov/flu/weekly/
Week 14, 2020
October 1, 2019 to present
Wisconsin 0 3
Nationwide 4 166
ILI: INSUFFICIENT DATA
AT-A-GLANCE:
Predominant Viruses of the Week: Rhino/enterovirus and COVID-19 were the predominant viruses this week.
Current Alerts:
The percentage of deaths attributed to pneumonia and influenza (P&I) increased for the fifth consecutive week. P&I last week was 10.3%, far exceeding the state threshold of 6.8%.
P&I percentage nationally also exceeds threshold levels.
Based on the low incidence of influenza statewide and nationally, the increase in P&I deaths is likely due to COVD-19..
Additional data on COVID-19 in Wisconsin can be found at
https://www.dhs.wisconsin.gov/covid-19/data.htm
Page 3
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
Influenza and Pneumonia Deaths, Wisconsin
INFLUENZA AND PNEUMONIA-ASSOCIATED MORTALITY
Influenza- and pneumonia-associated deaths by influenza season year and week, Wisconsin
Influenza season week
Influenza-
associated
deaths (I)
Pneumonia-
associated
deaths (P)
Percent I+P of
all deaths
Baseline I+P
of all deaths
Threshold I+P
of all deaths
12 19 92 8.3% 6.0% 6.8%
13 13 93 8.5% 6.0% 6.8%
14
Preliminary Data 7 99 10.3% 6.0% 6.8%
Seasonal total 167 2005 5.6% NA NA
Data source: DPH, Office of Health Informatics
Influenza- and pneumonia-associated deaths by most recent influenza season week,
Wisconsin, 2019-2020 season
3%
4%
5%
6%
7%
8%
9%
10%
11%
201
6-4
0
201
7-0
2
201
7-1
6
201
7-3
0
201
7-4
4
201
8-0
6
201
8-2
0
201
8-3
4
201
8-4
8
201
9-1
0
201
9-2
4
201
9-3
8
201
9-5
2
202
0-1
4
Percent of deaths associated with
influenza and pneumonia
Influenza season year-week
Percent of deaths associated with influenza and pneumonia Baseline Threshold
Page 4
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
Wisconsin positive influenza results and subtypes by PCR
Cumulative number of positive influenza PCR tests by subtype September 1, 2019 to present
WISCONSIN LABORATORY SURVEILLANCE
FOR RESPIRATORY VIRUSES BY PCR
0%
9%
18%
27%
36%
45%
0
900
1,800
2,700
3,600
4,500
8/24 9/21 10/19 11/16 12/14 1/11 2/8 3/7 4/4 5/2
% P
osi
tive
by
PC
R
Nu
mb
er o
f po
siti
ve d
ete
ctio
ns
Week ending
A (unknown subtype) A (H3N2 seasonal) A (H1N1) A (H3N2v)
B (unknown subtype) B (Victoria) B (Yamagata) Influenza % positive
57% 43%
A (2009 H1N1) A (H3N2) A (Unknown) B (Victoria) B (Yamagata) B (Unknown)
Total positive (n) 1003 168 19587 618 10 14770 36156
% of total positive 3% 0% 54% 2% 0% 41% 100%
Influenza A: Influenza B:Total
Page 5
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
Trends in respiratory virus activity by PCR
WISCONSIN LABORATORY SURVEILLANCE FOR
RESPIRATORY VIRUSES BY PCR
Respiratory virus Tested Positive
(n)
Positive
(%)
Influenza A Influenza B
H3N2 2009 H1N1 Unknown Victoria Yamagata Unknown
Influenza 3937 38 1.0% 0 4 17 0 0 17
Respiratory virus Tested
Positive
(n)
Positive
(%) Parainfluenza 1 Parainfluenza 2 Parainfluenza 3 Parainfluenza 4
Parainfluenza 1079 1 0.1% 0 0 1 0
Respiratory virus Tested Positive
(n)
Positive
(%) CoV 229E CoV OC43 CoV NL63 CoV HKU1
Coronavirus 60 2 3.3% 0 0 2 0
Respiratory virus Tested Positive (n) Positive (%)
RSV 2176 42 1.9%
Human metapneumovirus 1086 25 2.3%
Rhino-enterovirus 997 65 6.5%
Adenovirus 60 1 1.7%
Week 14: Ending on April 4, 2020
0%
10%
20%
30%
40%
50%
1/18 1/25 2/1 2/8 2/15 2/22 2/29 3/7 3/14 3/21 3/28 4/4
% P
osi
tive
by
PC
R (3
-we
ek
mo
vin
g av
era
ge)
Week ending
― Influenza― RSV― hMPV- - Rhino-Entero― Adenovirus- - Parainfluenza- - Coronavirus
Page 6
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
WISCONSIN STATE SUMMARY
ILI activity trend analysis
Influenza and RSV trend analysis
Influenza rapid antigen tests RSV rapid antigen tests Influenza-like illness (ILI)
Tested Positive (n)
% Positive Tested Positive (n) % Positive ILI % Baseline Threshold Influenza A Influenza B Total
717 7 4 11 1.5% 54 7 13.0% 3.5% 2.4% 3.6%
0%
1%
2%
3%
4%
5%
6%
7%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
Ave
rage
% I
LI
Week ending
Baseline Threshold 3-week moving average (average % ILI)
0%
8%
16%
24%
32%
40%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
% P
osi
tive
by
an
tige
n d
etec
tio
n
Week ending
3-week moving average (RSV) 3-week moving average (Influenza)
Page 7
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
WISCONSIN STATE SUMMARY
ILI activity trend analysis by influenza season, Wisconsin
Influenza-associated hospitalizations, Wisconsin Electronic Disease Surveillance System
September 1, 2019 to present
Reported cumulative influenza-associated hospitalizations by influenza season, Wisconsin
A (2009
H1N1)
A
(H3N2)
A
(Unknown)B
Not
reported
<1 87 5 0 35 26 21 12 4
1-4 205 6 0 63 68 68 29 9
5-17 313 4 0 64 98 147 28 11
18-49 881 51 2 423 189 216 124 41 71 13
50-64 1108 95 6 774 134 99 185 53
65+ 1848 166 20 1292 272 98 246 58
Total 4442 327 28 2651 787 649 624 176 71 13
Postpartum
(≤6 weeks)
Age group
(years)
Total
reported
(n)
Influenza subtypeAdmitted
to ICU
Required
mechanical
ventilation
Pregnant
0
1000
2000
3000
4000
5000
6000
7000
4 5 6 7 8 9 10 11 12 13 14
Influ
enza
-ass
ocia
ted
hosp
ital
izat
ions
, cu
mul
ativ
e (n
)
Influenza season week
2015-2016
2016-2017
2017-2018
2018-2019
2019-2020
0%
1%
2%
3%
4%
5%
6%
40 42 44 46 48 50 52 2 4 6 8 10 12 14 16 18 20
Ave
rage
% I
LI (3
-wee
k m
ovi
ng
ave
rage
)
Influenza season week
― 2015-16- - 2016-17- - 2017-18― 2018-19― 2019-20
Page 8
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
NORTHEASTERN REGION
ILI activity trend analysis
Influenza and RSV trend analysis
Influenza rapid antigen tests RSV rapid antigen tests Influenza-like illness (ILI)
Tested Positive (n)
% Positive Tested Positive (n) % Positive ILI % Baseline Threshold Influenza A Influenza B Total
196 3 1 4 2.0% 24 4 16.7% 2.4% 2.6% 4.0%
0%
1%
2%
3%
4%
5%
6%
7%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
Ave
rage
% I
LI
Week ending
Baseline Threshold 3-week moving average (average % ILI)
0%
8%
16%
24%
32%
40%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
% P
osi
tive
by
an
tige
n d
etec
tio
n
Week ending
3-week moving average (RSV) 3-week moving average (Influenza)
Page 9
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
NORTHWESTERN REGION
ILI activity trend analysis
Influenza and RSV trend analysis
Influenza rapid antigen tests RSV rapid antigen tests Influenza-like illness (ILI)
Tested Positive (n)
% Positive Tested Positive (n) % Positive ILI % Baseline Threshold Influenza A Influenza B Total
160 3 1 4 2.5% 26 3 11.5% 2.1% 1.9% 3.2%
0%
1%
2%
3%
4%
5%
6%
7%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
Ave
rage
% I
LI
Week ending
Baseline Threshold 3-week moving average (average % ILI)
0%
8%
16%
24%
32%
40%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
% P
osi
tive
by
an
tige
n d
etec
tio
n
Week ending
3-week moving average (RSV) 3-week moving average (Influenza)
Page 10
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
SOUTHEASTERN REGION
ILI activity trend analysis
Influenza and RSV trend analysis
Influenza rapid antigen tests RSV rapid antigen tests Influenza-like illness (ILI)
Tested Positive (n)
% Positive Tested Positive (n) % Positive ILI % Baseline Threshold Influenza A Influenza B Total
342 1 2 3 0.9% 3 0 0.0% 4.0% 2.9% 4.1%
0%
1%
2%
3%
4%
5%
6%
7%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
Ave
rage
% I
LI
Week ending
Baseline Threshold 3-week moving average (average % ILI)
0%
8%
16%
24%
32%
40%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
% P
osi
tive
by
an
tige
n d
etec
tio
n
Week ending
3-week moving average (RSV) 3-week moving average (Influenza)
Page 11
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
SOUTHERN REGION
ILI activity trend analysis
Influenza and RSV trend analysis
Influenza rapid antigen tests RSV rapid antigen tests Influenza-like illness (ILI)
Tested Positive (n)
% Positive Tested Positive (n) % Positive ILI % Baseline Threshold Influenza A Influenza B Total
35 2 2 4 11.4% 8 0 0.0% 5.2% 2.1% 3.2%
0%
1%
2%
3%
4%
5%
6%
7%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
Ave
rage
% I
LI
Week ending
Baseline Threshold 3-week moving average (average % ILI)
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
9/1 9/22 10/13 11/3 11/24 12/15 1/5 1/26 2/16 3/8 3/29 4/19 5/10 5/31
% P
osi
tive
by
an
tige
n d
etec
tio
n
Week ending
3-week moving average (RSV) 3-week moving average (Influenza)
Page 12
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
Influenza vaccine composition 2019-2020:
The trivalent vaccines for use in the 2019-2020 influenza season contain the following:
A/Brisbane/02/2018 (H1N1)pdm09–like virus (updated)
A/Kansas/14/2017 (H3N2)-like virus (updated) B/Colorado/06/2017-like (Victoria lineage) virus
It is recommended that quadrivalent vaccines containing two influenza B viruses contain the above three viruses and:
B/Phuket/3073/2013-like virus (Yamagata lineage)
Cumulative percentage of Wisconsin residents who received 1 or more doses of
influenza vaccine, 2019-2020 influenza season
SEASONAL INFLUENZA VACCINATION
Data source: All influenza vaccination rates presented were calculated using data from the Wisconsin
Immunization Registry (numerator) and Wisconsin population estimates (denominator).
42%
40%
70%
0% 50% 100%
This season so far
2018-19 Total Vaccinated
Healthy People 2020 GoalHealthy People 2020 Goal
2018-2019Total Vaccinated
2019-2020 as of 03/19/2020
As of 02/01/2020, the cumulative percent of Wisconsin residents vaccinated has surpassed the total from the 2018-2019 season.
Page 13
Division of Public Health Respiratory Virus Surveillance Report Week 14: Ending April 4, 2020
SEASONAL INFLUENZA VACCINATION
Percentage of Wisconsin residents who received one or more doses of influenza
vaccine, by age group and influenza season
Each season includes doses administered during the same time period (August 1 through May 3).
Percentage of Wisconsin residents who received one or more doses of influenza
vaccine, by race and ethnicity and region, 2019-2020 influenza season
Southeastern Western Southern
27%
32%
26%
38%
30%
39%
42%Total
Non-Hispanic
Hispanic
White
Black
Asian
American Indian/
Alaska-Native
All of Wisconsin Northeastern Northern
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 years 1 to 4 years 5 to 17 years 18 to 49 years 50 to 64 years 65 years plus All Ages
2015-2016 2016-2017 2017-2018 2018-2019 2019-2020 as of current week
33%
31%
25%
40%
30%
41%
43%
27%
32%
21%
38%
26%
40%
41%
22%
32%
22%
39%
29%
40%
41%
34%
34%
24%
36%
30%
37%
46%
15%
32%
26%
37%
29%
39%
40%