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HealthQuiet 5d · day 6

NYC West Nile cases hit record; 30 confirmed, surpassing all of 2025

Record mosquito pools and warming climate drive spike in the mosquito-borne disease across all five boroughs.

newest coverage 5d agosummary written 4d ago8 pieces NewswiresGoogle News

What to know

  • NYC has recorded 30 confirmed West Nile virus cases by mid-September 2026, already surpassing the entire 2025 total of 18 cases.
  • 24 of the 30 cases are classified as West Nile neuroinvasive disease, affecting the central nervous system with symptoms including encephalitis, meningitis, and paralysis.
  • Over 1,700 positive mosquito pools have been detected—a city record—driven by climate change; warmer temperatures and increased rainfall accelerate mosquito breeding and viral transmission.
  • Most infected people show no or mild symptoms and don't seek testing; the high proportion of severe cases in official counts reflects that only the sickest get hospitalized and tested.

“With this increased rainfall and humidity, it makes it easier for mosquitoes to thrive, and then these longer, warmer seasons where we're having mosquitoes appear earlier and are active later in the year, there's more opportunity for transmission to occur.”

Sally Slavinski, NYC Health Dept. director · NY Post ↗

Sally Slavinski Director, NYC Health Department Zoonotic and Vector-Borne Disease UnitNew York City Health Department Public health authority

NYC West Nile cases hit record; 30 confirmed, surpassing all of 2025
NY Post

How it unfolded 2 developments, newest first · click a bar or a number to jump articles

Peak 5 pieces in two hours at Sep 18, 3 PM; 8 pieces over 6 days (8 articles) Sep 18, 5 AM — 2 pieces · 2 articles — Google News 1, Newswires 1Sep 18, 7 AM — quietSep 18, 9 AM — quietSep 18, 11 AM — quietSep 18, 1 PM — quietSep 18, 3 PM — 5 pieces · 5 articles — Google News 5Sep 18, 5 PM — quietSep 18, 7 PM — quietSep 18, 9 PM — 1 piece · 1 article — Newswires 1Sep 18, 11 PM — quietSep 19, 1 AM — quietSep 19, 3 AM — quietSep 19, 5 AM — quietSep 19, 7 AM — quietSep 19, 9 AM — quietSep 19, 11 AM — quietSep 19, 1 PM — quietSep 19, 3 PM — quietSep 19, 5 PM — quietSep 19, 7 PM — quietSep 19, 9 PM — quietSep 19, 11 PM — quietSep 20, 1 AM — quietSep 20, 3 AM — quietSep 20, 5 AM — quietSep 20, 7 AM — quietSep 20, 9 AM — quietSep 20, 11 AM — quietSep 20, 1 PM — quietSep 20, 3 PM — quietSep 20, 5 PM — quietSep 20, 7 PM — quietSep 20, 9 PM — quietSep 20, 11 PM — quietSep 21, 1 AM — quietSep 21, 3 AM — quietSep 21, 5 AM — quietSep 21, 7 AM — quietSep 21, 9 AM — quietSep 21, 11 AM — quietSep 21, 1 PM — quietSep 21, 3 PM — quietSep 21, 5 PM — quietSep 21, 7 PM — quietSep 21, 9 PM — quietSep 21, 11 PM — quietSep 22, 1 AM — quietSep 22, 3 AM — quietSep 22, 5 AM — quietSep 22, 7 AM — quietSep 22, 9 AM — quietSep 22, 11 AM — quietSep 22, 1 PM — quietSep 22, 3 PM — quietSep 22, 5 PM — quietSep 22, 7 PM — quietSep 22, 9 PM — quietSep 22, 11 PM — quietYesterday, 1 AM — quietYesterday, 3 AM — quietYesterday, 5 AM — quietYesterday, 7 AM — quietYesterday, 9 AM — quietYesterday, 11 AM — quietYesterday, 1 PM — quietYesterday, 3 PM — quietYesterday, 5 PM — quietYesterday, 7 PM — quietYesterday, 9 PM — quietYesterday, 11 PM — quietToday, 1 AM — quiet 12
Sep 19Sep 20Sep 21Sep 22yesterdaynow · 2:56 AM ET
  1. 2

    Updated count30 confirmed West Nile cases in NYC; 1,700+ positive mosquito pools on record

    The count rose to 30 confirmed cases, with Brooklyn leading at 11 cases. The city also recorded over 1,700 positive mosquito pool samples—a record—compared to 1,300 the previous year. Twenty-four cases are classified as neuroinvasive disease.

    1. 5 outlets NYC West Nile Virus Cases Surpass Last Year’s Total, City Health Data Shows

      first by Hudson Reporter, 5d ago · also The Mary Sue, Gothamist, NY Post, New York Post

      3 more headlines

    2. 1 outlet first by Yahoo, 5d ago · read ↗

  2. 1

    Slavinski attributes surge to climate change; warming accelerates transmission cycle

    City health official Sally Slavinski, director of the Zoonotic and Vector-Borne Disease Unit, stated that warmer temperatures and increased rainfall create conditions for mosquitoes to thrive earlier and later in the year, shortening the time from infection to transmission.

    “Warmer temperatures can accelerate the mosquito life cycle and speed up viral replication in the mosquito…with increased rainfall and humidity, it makes it easier for mosquitoes to thrive.”
    — Sally Slavinski
  3. background

    NYC health data shows 23 confirmed West Nile cases; exceeds 2025 total — The city's health department confirmed 23 cases of West Nile virus distributed across all five boroughs. Of these, 18 were categorized as West Nile neuroinvasive disease, the more severe outcome affecting the central nervous system.

  4. background

    First confirmed West Nile case announced in NYC for 2026 — The first case of West Nile virus for the year was announced in early August, marking the start of what would become a record season for the disease in the city.