New York City's Legionnaires' disease outbreaks from Harlem to the Bronx

Active · last development Sep 13, 2026: “Yankee Stadium listed in Legionnaires cluster: Officials”

What this arc covers

The Legionnaires' disease outbreaks in New York City: the 2025 cluster in Harlem linked to city-run buildings, the 2026 outbreak on the Upper East Side traced to cooling towers, the deaths in both, the lawsuit by Harlem victims, Mayor Zohran Mamdani's new measures, and the later cases in the Bronx.

New York City

Earliest story we hold Jul 31, 2025 · 23 stories · 68 independent sources (counted once each) · 409 days

Part ofNew York CityManhattanNew YorkHarlemZohran MamdaniThe Bronx

Part of Disease outbreaks

  1. The return of measles to the US and the outbreaks in Texas and beyondJan 5, 2024 – Sep 23, 2026
  2. The H5N1 bird flu outbreak in US cattle, poultry and peopleJan 27, 2024 – Nov 22, 2025
  3. New York City's Legionnaires' disease outbreaks from Harlem to the BronxThis arcJul 31, 2025 – Sep 13, 2026
  4. The 2026 hantavirus outbreak on a cruise ship and the passengers' quarantinesMay 3 – Jul 2, 2026
  5. The 2026 Ebola outbreak in Congo and UgandaMay 15 – Sep 28, 2026
  6. The 2026 US cyclospora outbreak, the largest on recordJun 30 – Sep 10, 2026
  7. The 2026 salmonella outbreak traced to jalapeños from a Mexican farmAug 4 – Aug 13, 2026

Where it standsnewest first · each bar runs left to right by leaning

Sep 13– 142026Yankee Stadium listed in Legionnaires cluster: Officials25 articles · 18 independent sources
2 left, 6 center, 2 right
Sep 10– 1120261 dead, 5 diagnosed with Legionnaires' disease in the Bronx: Health officials22 articles · 15 independent sources
4 left, 7 center, 1 right
Sep 1– 22026Mayor Mamdani announces new measures to combat Legionnaires' disease5 articles · 4 independent sources
1 left, 3 center, 0 right

Key momentsthe most covered; every story is below

  1. Aug 5 – 7, 2025New York City Legionnaires' disease outbreak death toll climbs to 3; 67 ill49 articles · 23 independent sources
  2. Jul 17 – 19, 2026Two deaths reported in New York City Legionnaires’ disease cluster25 articles · 19 independent sources
  3. Jul 19 – 21, 20264th death reported in NYC Legionnaires’ disease outbreak45 articles · 27 independent sources
  4. Jul 28 – 31, 2026New York City Legionnaires’ disease outbreak linked to 7 deaths is declared over33 articles · 20 independent sources
    1. Jul 28, 2026Sixth person dies to Upper East Side's Legionnaires' outbreak
    2. Jul 30, 2026Only center coverage:7th death confirmed in Manhattan Legionnaires' outbreak, matching total from 2025 outbreak
  5. Sep 13 – 14, 2026Yankee Stadium listed in Legionnaires cluster: Officials25 articles · 18 independent sources

Who covered it, over timeindependent sources per week, by side

Jul 2025Oct 2025Jan 2026Mar 2026Jun 2026Sep 2026

LeftCenterRight

Point at or tap a week to see its count by side.

Every week as a table
Week ofLeftCenterRightArticles
Jul 28, 20251417
Aug 4, 2025512147
Aug 18, 202526216
Aug 25, 202535116
Jun 29, 20261225
Jul 6, 202677547
Jul 13, 2026612589
Jul 20, 2026414655
Jul 27, 202667133
Aug 3, 20264419
Aug 31, 20261305
Sep 7, 202647125
Sep 14, 202626121

Stories before June 28, 2026 come from archived pages, so who covered them is limited to the outlets we recovered for that period.

26% left · 59% center · 15% right of 68 independent sources among the outlets we track, across 23 stories.

Every storyoldest first

  1. July 2025

    Jul 311 dead, 22 sick from Legionnaires' cluster in Harlem, health officials say8 articles · 8 independent sources
    1 left, 4 center, 1 right

  2. August 2025

    Aug 5– 7New York City Legionnaires' disease outbreak death toll climbs to 3; 67 ill49 articles · 23 independent sources
    5 left, 12 center, 1 right
  3. Aug 18– 19NYC Legionnaires' disease outbreak: 5th person has died5 articles · 5 independent sources
    1 left, 3 center, 1 right
  4. Aug 19– 22Death toll from Legionnaires' disease outbreak in New York City rises to 6 and infections hit 11111 articles · 10 independent sources
    1 left, 3 center, 1 right
  5. Aug 29– 30NYC Legionnaires' outbreak linked to two city-run buildings, including Harlem Hospital17 articles · 14 independent sources
    3 left, 5 center, 1 right

  6. July 2026

    Jul 2– 4Legionnaires cluster emerging on Upper East Side, NYC officials say5 articles · 5 independent sources
    1 left, 2 center, 2 right
  7. Jul 6– 9Legionnaires’ disease outbreak: Case count rises to 36 as city continues emergency response efforts21 articles · 16 independent sources
    6 left, 6 center, 3 right
  8. Jul 9– 11Legionnaires' outbreak: NYC identifies certain Upper East Side buildings6 articles · 4 independent sources
    1 left, 2 center, 1 right
  9. Jul 10– 15Dozens of New York cooling towers test positive for Legionnaires’ bacteria as outbreak reaches 60 cases14 articles · 11 independent sources
    2 left, 2 center, 1 right
  10. Jul 10– 14Guggenheim Museum among NYC buildings that tested positive for Legionnaires’ disease18 articles · 18 independent sources
    2 left, 0 center, 4 right
  11. Jul 13– 16New cases slow in NYC Legionnaires' disease outbreak; Met museum among buildings with positive tests17 articles · 14 independent sources
    2 left, 3 center, 0 right
  12. Jul 15Dozens of New York cooling towers test positive for Legionnaires’ bacteria as outbreak reaches 63 cases6 articles · 6 independent sources
    0 left, 2 center, 1 right
  13. Jul 17– 19Two deaths reported in New York City Legionnaires’ disease cluster25 articles · 19 independent sources
    3 left, 6 center, 2 right
  14. Jul 17– 20Second patient dies in outbreak of Legionnaires’ disease in Manhattan12 articles · 8 independent sources
    3 left, 4 center, 0 right
  15. Jul 17– 18First death reported in Legionnaires’ disease outbreak in New York City6 articles · 6 independent sources
    1 left, 0 center, 0 right
  16. Jul 19– 214th death reported in NYC Legionnaires’ disease outbreak45 articles · 27 independent sources
    2 left, 8 center, 4 right
  17. Jul 214th person dies from Legionnaires' disease outbreak in Manhattan6 articles · 2 independent sources
    0 left, 2 center, 0 right
  18. Jul 22Fifth death reported in NYC Legionnaires' outbreak19 articles · 16 independent sources
    1 left, 2 center, 3 right
  19. Jul 28– 31New York City Legionnaires’ disease outbreak linked to 7 deaths is declared over33 articles · 20 independent sources
    6 left, 7 center, 1 right

  20. August 2026

    Aug 6– 7Legionnaires' outbreak victims in Harlem sue NYC in wake of UES cluster9 articles · 9 independent sources
    4 left, 4 center, 1 right

  21. September 2026

    Sep 1– 2Mayor Mamdani announces new measures to combat Legionnaires' disease5 articles · 4 independent sources
    1 left, 3 center, 0 right
  22. Sep 10– 111 dead, 5 diagnosed with Legionnaires' disease in the Bronx: Health officials22 articles · 15 independent sources
    4 left, 7 center, 1 right
  23. Sep 13– 14Yankee Stadium listed in Legionnaires cluster: Officials25 articles · 18 independent sources
    2 left, 6 center, 2 right