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Cases of West Nile virus soar in NYC, surpassing total number in 2025

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Cite

Morrison, E. (2026, September 19). Cases of West Nile virus soar in NYC, surpassing total number in 2025. New York Post. https://nypost.com/2026/09/18/us-news/cases-of-west-nile-virus-soar-in-nyc-surpassing-total-number-in-2025/

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New York Post · collected 2026-09-19 · by Ella Morrison

Quick Summary

New York City has seen a significant increase in cases of West Nile virus this year, surpassing the total number from 2025. Brooklyn leads with 11 confirmed cases, followed by Queens and Staten Island each reporting seven cases; the Bronx and Manhattan have three and two cases respectively. Of these 30 confirmed cases, 24 are severe neuroinvasive diseases, while six are mild fever cases. City health official Sally Slavinski attributes this rise to warmer temperatures and increased rainfall, which create ideal conditions for mosquito breeding.
Written by AI on 2026-09-19, from this article's own text only (the story summary below draws on all the coverage).

AI analysis

Story summary

In 2026, New York City saw a significant increase in West Nile virus cases, surpassing the total number reported in 2025. As of now, there are 30 confirmed cases across all five boroughs, with Brooklyn leading at 11 cases. Queens and Staten Island each have seven cases, while the Bronx reports three and Manhattan has two. Among these cases, 24 are classified as severe West Nile neuroinvasive disease, including encephalitis, meningitis, or acute flaccid paralysis.

City health official Sally Slavinski attributes this rise to warmer temperatures, which accelerate mosquito life cycles and viral replication within them. Additionally, the city has detected over 1,700 positive mosquito pools in 2026, a record high compared to about 1,300 last year. This surge highlights the growing health risk posed by West Nile virus in urban areas as climate change continues to impact vector-borne diseases.

Written for “West Nile Virus Surge NY” on 2026-10-30, grounded in this article and the 0 other(s) covering the same event.

Story

📰 West Nile Virus Surge NY
Health · 1 article(s) covering the same event.

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How this article was measured signals, leaning charts, publisher record, byline, topics and claims

Signals How these are calculated →

Claims extracted
14
sentences that state something as happening or true
Uncertain
36%
5 of 14 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
66/100
New York Post's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Health
Same framing elsewhere
1
articles that frame the event the way this one does
Analyzed 2026-09-19 · how these are computed

How this is being covered How these are calculated →

Article leaning vs. publisher reliability
Source leaning vs. consistency

Publisher

New York Post · 15208 article(s) · 35 correction(s) detected
Running correction rate · 35 correction(s)

Who wrote this

Ella Morrison
90 article(s) here · 1 carrying a prediction
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Also by Ella Morrison
Nothing else under this byline is closely related to this article, so these are simply their most recent.
All 90 articles by Ella Morrison →

Topics

Bronx Brooklyn Queens Staten Island the Big Apple

Subjects

Slavinski PERSON · 5× the Big Apple GPE · 2× Bronx GPE · 1× Brooklyn GPE · 1× Gotham GPE · 1× Gothamist ORG · 1× Manhattan GPE · 1× New York City GPE · 1× Queens GPE · 1× Staten Island GPE · 1×

Narrative

Slavinski, who works as the director of the city health department Zoonotic and Vector-Borne Disease unit, believes warmer temperatures are to blame for the uptick. “We know that warmer temperatures can accelerate the mosquito life cycle and speed up viral replication in the mosquito, so that’s gonna shorten the time that it takes for there to be an infected mosquito and then transmit that virus,” Slavinski told Gothamist.
framing: mixed · carried by 1 article(s) · first seen 2026-09-19
🔮 Most people infected by the disease never experience symptoms — but approximately one in five may develop a mild illness that can include fever, headache, body ache, nausea and vomiting.
2026-09-19 · New York Post
Cases of West Nile virus soar in NYC, surpassing total number in 2025 · mixed framing

Claims (14 extracted, 5 hedged)

The number of Big Apple residents diagnosed this year with the potentially dangerous West Nile virus has surpassed the total number of cases in 2025, according to city health data. uncertain
number → diagnose → data
All five boroughs have been plagued by the positive blood-suckers but Brooklyn leads the pack with 11 confirmed cases of the virus. asserted
Brooklyn → plague → virus
Queens and Staten Island each have seven cases, the Bronx has reported three and Manhattan has two. asserted
Manhattan → have → two
Of the 30 confirmed cases across the Big Apple, 24 of those are characterized as the more severe West Nile neuroinvasive disease which include encephalitis, meningitis or acute flaccid paralysis. asserted
which → confirm → encephalitis
The remaining six cases are classified as West Nile fever, with no evidence of central nervous system involvement. Gotham has also seen an increase in the number of positive mosquito pools plaguing the boroughs — with over 1,700 positive samples in 2026 compared to a little over 1,300 last year. asserted
Gotham → remain → 1,300
The number of positive blood-sucker samples in the Big Apple this year is a record, according to city health official Sally Slavinski. uncertain
number → accord → Slavinski
Slavinski, who works as the director of the city health department Zoonotic and Vector-Borne Disease unit, believes warmer temperatures are to blame for the uptick. “We know that warmer temperatures can accelerate the mosquito life cycle and speed up viral replication in the mosquito, so that’s gonna shorten the time that it takes for there to be an infected mosquito and then transmit that virus,” Slavinski told Gothamist. asserted
Slavinski → work → Gothamist
“With this increased rainfall and humidity, it makes it easier for mosquitoes to thrive,” she said, adding that “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.” The health department monitors populations of the flying pest and applies pesticides during the summer months to reduce the number of the mosquitos. asserted
department → increase → mosquitos
West Nile virus is the only mosquito-borne disease known to spread to humans in New York City and has been plaguing residents for over 25 years. asserted
virus → bear → years
Most people infected by the disease never experience symptoms — but approximately one in five may develop a mild illness that can include fever, headache, body ache, nausea and vomiting. uncertain
that → infect → fever
Slavinski says the higher rate of confirmed neuroinvasive cases — the more severe outcome from West Nile disease — indicates that most infected New Yorkers don’t get sick enough to seek medical care, so the numbers might not be 100% accurate. uncertain
numbers → say → care
“Young, healthy people are not even realizing they may be infected or might have some mild illness,” she told the publication, adding that, “these are folks that are not necessarily getting tested.” uncertain
that → realize → publication
“So we don’t know about these folks that weren’t sick or had mild illness,” Slavinski said. asserted
Slavinski → know → illness
The city official added that “the people that are more likely to get tested” for West Nile disease “are the people who are really sick; they’re getting hospitalized, and they’re getting worked up.” “These are the folks with West Nile neuroinvasive disease,” she said. asserted
she → add → disease
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