West Nile Virus: What's Happening in NYC?
First Human Cases Confirmed in 2025
New York City has confirmed its first human cases of West Nile virus in 2025. Two individuals from Queens have been affected, while the virus has also been detected in blood donations from Brooklyn and Staten Island. However, these donors did not meet the criteria for a confirmed case.
Transmission and Risk Period
The virus is transmitted by mosquitoes, which are active in the city from May to October. Since July, the virus has been found in mosquitoes across all five boroughs, with the highest risk occurring in August and September.
Health Risks and Symptoms
West Nile virus can be particularly severe for older adults and individuals with weakened immune systems. Most infected people do not experience symptoms, but some may develop:
- Fever
- Headaches
- Muscle aches
- Rash
- Extreme fatigue
One of the confirmed cases has been discharged, while the other remains hospitalized with encephalitis.
Precautionary Measures
Health officials are advising New Yorkers to take the following precautions:
- Use insect repellent
- Wear long sleeves and pants during dawn and dusk
- Avoid outdoor activities during peak mosquito hours if immune-compromised
Citywide Mosquito Control Efforts
The city is actively working to reduce the mosquito population through:
- Spray operations
- Larviciding
Spraying is scheduled for Monday through Wednesday in the Bronx, Manhattan, and Staten Island.
Next Steps and Investigations
Anyone experiencing symptoms should contact their healthcare provider. The city is also investigating additional potential cases in Brooklyn and expects to release more information soon.