Overview
- Health officials confirmed Monday that four people have died and 76 cases are linked to the Upper East Side cluster concentrated in ZIP codes 10028, 10075 and 10128.
- Investigators sampled 183 cooling towers and used rapid PCR screening to detect Legionella genetic material in 76 towers, then ordered those towers to be drained, cleaned and disinfected.
- City teams say all 76 buildings reported completing remediation by July 16, but slower culture tests and whole‑genome sequencing are still pending to prove which towers contained live bacteria and to match strains to patients.
- New symptomatic cases have fallen sharply from early July levels and officials say they have not seen new symptoms in more than a week, but inspections, enforcement and potential fines or legal action against tower owners are continuing.
- The outbreak underscores how Legionnaires' spreads through contaminated water vapor from large cooling systems, highlights gaps in tower maintenance and recalls a larger 2025 Harlem outbreak that prompted stricter testing rules and increased inspections.