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West Nile Virus Overview, CY 03

Agenda. 1. Significant Events, 20032. 2003 WNV Surveillance Overview3. 2004 WNV Surveillance

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West Nile Virus Overview, CY 03

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    2. Agenda 1. Significant Events, 2003 2. 2003 WNV Surveillance Overview 3. 2004 WNV Surveillance & Prevention

    3. 1. Significant Events, CY 03 Expansion of range: to the plains states of the US, prairie provinces of Canada (87% from Sask & Alb), Mexico (21/31 states & DF) and the Caribbean; often rural distribution Possible role of alligators as reservoirs All three CHPPM Subordinate Commands involved in mosquito ID and testing

    5. 2. WNV Surveillance Overview 4 components: Equines Birds Mosquitoes Humans

    8. Avian Surveillance Dead Bird Surveillance: Dead birds are the most valuable indicator of viral presence, sensitive species: crows, jays, raptors Suitable specimens submitted to appropriate diagnostic lab by installation vets (State/Federal Health & Wildlife agencies) Dead birds + for WNv from 24 installations Sentinel Chicken Flock surveillance: Fort Polk, LA, Langley AFB, VA; + sentinel chickens at both installations Issues: VETCOM involvement; reporting of negative results (esp from state labs)

    10. Mosquito Surveillance Installation PVNTMED/DPW Mosquito collection, public education, notification, control CHPPM-Subordinate Commands Installation collection support Mosquito identification & testing Rapid response for enhanced surveillance Data dissemination POPM-SA Entomologist MEDCOM policy memo; collect info from CHPPM sub cmds, RMCs; weekly EXSUMS to OTSG Results. >222K F mosquitoes (~22K pools) were tested by CHPPM labs; 160 + for WNv and 3 + for EEE (29 installations +)

    12. Human Surveillance & Case Reporting MTF/Clinic Personnel - WNV diagnosis, education State labs (vice USAMRIID) - serology of suspected cases Donated blood testing Issue: reporting human cases very uneven

    20. Issues from 2003 Cost & level of effort required to estimate threat to military, dependents and retirees versus “payoff” Human case definitions and reporting uneven Impact of PVNTMED deployments on CHPPM, RMCs and MEDDACs Number of mosquitoes submitted to CHPPM for ID/testing overwhelmed system State laboratory support (birds & mosquitoes): Turn-around time, Lab capacity, Result reporting, Negative Data?

    22. 3. 2004 WNV Surveillance & Prevention Dead bird surveillance Remains a cornerstone Discontinue collection after 5 WNV positives Continue to use the USGS Laboratory Negative Results from State diagnostic labs generally were not reported above installation level; we must improve result reporting (installation chain of command as well as to DOD level).

    23. 2004 WNV Surveillance & Prevention Mosquito surveillance Surveillance guide on the CHPPM Web site Larval site surveys & larval control – begins April-June regionally Adult mosquito surveillance: Based on regional conditions may begin early June. Trap a minimum of 2 nights per week (CDC gravid trap and/or CDC light trap), 3 traps/night to 10 traps/night. Submit mosquito pools by genus/and or species to respective CHPPM Subordinate Command

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