Manhattan’s Upper East Side is experiencing a growing outbreak of Legionnaires’ disease, a form of pneumonia caused by Legionella bacteria. Multiple outlets report that New York City health officials are testing cooling-tower systems in the neighborhood and identifying buildings with positive PCR results for Legionella. ABC7, Gothamist and other outlets describe an effort to map and later publish a list of affected buildings, including specific addresses and tower locations. Reports also note that officials are working to identify the source of the cluster by focusing on aerosol exposure from contaminated water systems.

Across coverage, the number of reported cases rises over time, with figures cited including 46, 60, 63, and 76 cases depending on the reporting date. Some sources report hospitalizations and discharges, and at least one outlet says a fourth death has occurred. The testing and remediation effort includes requirements for building owners to drain, clean, and disinfect cooling towers with positive results. Officials emphasize that the risk is linked to inhaling mist from contaminated water rather than person-to-person spread. Health officials and experts also link the recurrence of such outbreaks to environmental conditions that can help Legionella thrive, including warmer temperatures.