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During the 2023 season, the Philadelphia Department of Public Health (PDPH) has identified 2 neuroinvasive West Nile virus (WNV) infections. Both cases occurred in adults ≥50 years of age who were hospitalized in late August. One case had a significant underlying medical history and was fatal. An adult with WNV fever and an asymptomatic, presumptive viremic blood donor also were reported in 2023.
The WNV mosquito pool positivity in 2023 is higher than the year-to-date historic median rate (30% vs 8%) but lower than rates observed in 2018, 2021, and 2022 (34–45%), peak WNV activity seasons in Philadelphia. 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.).
Click here to download the latest 2023 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 35 (9/3 - 9/10) |
2023 Season (5/1 - 9/10) |
|
---|---|---|
Mosquito Pools Tested |
47 |
772 |
WNV Positive Pools |
24 |
229 |
Human WNV Cases |
0 |
3 |
Neuroinvasive WNV |
2 |
|
WNV Fever |
0 |
1 |
Human WNV Deaths |
0 |
1 |
Presumptive Viremic Donors |
0 |
1 |
*772 mosquito pools at 89 different mosquito trapping sites
**Testing among case reports received by PDPH only
Advise your patients to:
WNV Testing and Reporting Requirements for Human Surveillance in Philadelphia: