First Human Cases of West Nile Virus Reported in New York City for 2025
Two residents of Queens have tested positive for West Nile Virus, marking the first human cases of the year in New York City, according to the health department’s announcement on Friday.
Additionally, the virus was found in blood donations from two other individuals—one from Brooklyn and the other from Staten Island. However, health department spokesperson Laura Brahm clarified that neither donor qualified as a case after their interviews.
The health department is also looking into additional reports of cases in Brooklyn, with expectations to have more details available in about two weeks.
Human infections occur when people are bitten by mosquitoes carrying the virus, which typically are active in the city from May to October. Mosquitoes carrying the virus have been detected throughout all five boroughs since July, with the highest risk occurring in August and September, as per health officials.
While the virus can be serious—and sometimes fatal, particularly for the elderly and those with compromised immune systems—health officials are advising residents to take precautions. They’re recommending the use of repellent and wearing long-sleeved clothing during early morning and evening hours. Those with weakened immune systems should consider staying indoors during those times.
“West Nile virus can cause significant illness, especially among those over 55 and others with weakened immune systems,” said Acting Health Commissioner Dr. Michelle Morse in a statement.
The Centers for Disease Control and Prevention notes that the mortality rate for individuals aged 70 and older is around 20%, while it drops to about 2% for those under 50. The rate can rise to between 30% and 40% for certain groups, including those with specific blood cancers and those receiving stem cell or organ transplants.
Most people infected with the virus may not show symptoms; however, some could experience fever, headaches, muscle aches, rashes, and significant fatigue.
Of the two confirmed human cases this season, one individual has already been discharged after a short hospitalization, while the other remains in the hospital with encephalitis, an inflammation of the brain.
Since August 22, the city has reported 988 positive mosquito pools, which is less than what was recorded this time last year. In response, the city is undertaking various treatments, including spray operations and larviciding.
Mosquito control sprays are scheduled from Monday to Wednesday in the Bronx, Manhattan, and Staten Island.
Residents who suspect they may have contracted the virus are encouraged to reach out to their healthcare providers.
This story has been updated with additional information.
