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On May 8th, the first mosquito pool infected with West Nile Virus (WNV) in Philadelphia for the 2024 season was collected in Northeast Philadelphia. Since May, positive pools have been identified at 45 sites across the City. The WNV pool positivity in 2024 has started to increase earlier compared with the year-to-date historic median rate from 2001–2023 (16% vs 0%). No human cases have been reported in the City this season, but increased risk for human infection will continue in Philadelphia until the first hard frost occurs.
From May through October, PDPH, in collaboration with the PA Department of Environmental Protection, conducts mosquito management activities throughout Philadelphia, which entails surveillance and identification of mosquito pools, testing pools for WNV, and control activities (eliminating breeding sites, larviciding catch basins, ground spraying, etc.). Since May 2024, 52 locations in Philadelphia were treated to control larval mosquito populations and six locations to control adult mosquito populations.
Click here to download the latest 2024 West Nile Virus report in a printable format.
Click here to download the 2022 season summary report of West Nile Virus in a printable format.
Week 28 (7/7) - 7/13) |
2024 Season (5/1 - 7/13) |
|
---|---|---|
Mosquito Pools Tested |
66 |
430 |
WNV Positive Pools |
37 |
69 |
Human WNV Cases |
0 |
0 |
Neuroinvasive WNV |
0 |
0 |
WNV Fever |
0 |
0 |
Human WNV Deaths |
0 |
0 |
Presumptive Viremic Donors |
0 |
0 |
*430 mosquito pools at 75 different mosquito trapping sites
State and National WNV Activity Reports
Advise your patients to:
WNV Testing and Reporting Requirements for Human Surveillance in Philadelphia: