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2204/19/23
Bunyaviridae Bunyaviridae
Structure Classification Multiplication Clinical manifestations Epidemiology Diagnosis Control
Baron’s Web Site
3304/19/23
Structure Spherical enveloped particles
– 90-100 nm virus encoded transcriptase 2 external glycoproteins multipartite - 3 segments of
SS RNA– antisense - SS RNA
C=122
4404/19/23
Classification Genera
–Bunyaviruses– Phlebovirus–Nairovirus–Uukuvirus–Hantavirus
Immunologically– 35 serogroups– 300 types &
subtypes
5504/19/23
BunyaViruses ARthropod BOorne viruses
–Phlebovirus–Nairovirus–Uukuvirus–Hantavirus
ROdent BOrne Viruses
–Bunyaviruses
9904/19/23
Serious Bunya Virus Diseases
Crimean Congo Hemorrhagic Fever Virus
Rift Valley Fever Virus La Crosse Virus Hanta Virus
121204/19/23
Epidemiology Determined by distribution of
vector and mammalian host Humans: accidental dead end
hosts
131304/19/23
Diagnosis
Presumptive febrile illness geographic site of
exposure Sean vectors
Confirmation virus isolation Virus specific IgM Rise in antibody
titer
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Control Control Vectors
– arthropods– rodents
Vaccination– Humans: Crimean Congo– Sheep & Cattle : Rift Valley
151504/19/23
Crimean Congo Hemorrhagic Fever Virus
Headache pain in limbs bleeding from multiple orifices
181804/19/23
Hanta Virus
Rodents - transmission to humans via aerosolized excretions and bites. A wide variety of biting insects.
Hanta virus Web site
202004/19/23
Hanta Virus tripartite negative-
sense RNA – L,>>viral
transcriptase– M>> envelope
glycoproteins– >. nucleocapsid
protein
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Hantavirus Pulmonary Syndrome
febrile prodrome followed by
– non-cardiogenic pulmonary edema,
– hypotension – shock
222204/19/23
Hantavirus
Four corners New Mexico – May 1993 8 deaths
April 5, 199468 cases in 17 states– Deermouse in New Mexico - principal
reservoir do not cause infections - found in saliva, urine, feces and is shed sporadically
-infected animals - blood, organs, saliva feces, urine.
232304/19/23
Hanta virus ...continued
– Humans visiting holding areas for animals can become infected in five minutes.
– outbreaks of this and associated diseases have been observed in
Baltimore, MarylandSoeul, KoreaBelgiumEngland