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Insects as Pest Part E

Insects as Pest Part E - • A reservoir host is a wild...

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Insects as Pests of Humans (Part E) V West Nile Virus Transmitted by specific kinds of mosquitoes to birds, horse, and humans Over 40 kinds of mosquitoes can carry the virus Diagnosis of illness is based on blood samples It is an encephalitis, like St. Louis, Eastern Equine, or Western Equine encephalitis A relatively new disease in the US H West Nile Virus Transmission Cycle Mosquito vector Incidental infections Bird reservoir hosts Incidental infections Enzootic/epizootic Cycle V
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West Nile Virus: Human Disease Mosquito bites human, injects virus particles into bloodstream The Illness Flu-like illness with abrupt onset Moderate to high fever Headache, sore throat, backache, fatigue Rash Acute aseptic meningitis or encephalitis Most fatal cases >50 years old. H West Nile Virus: Reservoir Hosts
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Unformatted text preview: • A reservoir host is a wild host population in which the virus can multiply • Reservoir Hosts • Wild birds, such as crows • Migratory birds distribute and re-introduce West Nile virus into areas • Role of other vertebrates not known. V West Nile Fever: US Outbreak • Early August 1999: • Die-offs of crows in areas surrounding Bronx Zoo • Late August 1999: • Human encephalitis in New York City and surrounding areas • Horse deaths in Long Island • Death of zoo birds: Flamingos, cormorants, bald eagle, snowy owl H West Nile Virus Spread V Human Cases: 2002 H To avoid WNV, avoid mosquitoes, by same methods as presented for encephalitis 2003: 9862 cases, 264 deaths 2004: 2151 cases, 68 deaths (as of Oct 2004)...
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