NYC Health Probes Upper East Legionnaires Outbreak, 14 Cases

New York City health officials are investigating a growing outbreak of Legionnaires' disease on the Upper East Side, with 14 confirmed cases as of Sunday. The cases are concentrated in the Carnegie Hill and Yorkville neighborhoods, and officials have expanded the investigation zone to include three ZIP codes: 10028, 10128, and 10075.

The city announced the first two cases on Thursday, July 2. By Friday, the number had risen to 10, and it reached 14 by Sunday. No deaths have been linked to the outbreak. Health Commissioner Dr. Alister Martin said the department is actively investigating the community cluster by sampling and testing water from all cooling tower systems in the area. Inspections are continuing through the holiday weekend.

Officials believe the source of the outbreak is likely contaminated cooling towers, a common vector in past clusters. The Legionella bacteria, which causes the disease, grows in warm water and spreads through the air via mist. Building owners whose cooling towers test positive will be directed to conduct full remediation. Officials stressed that it remains safe to use air conditioners, drink tap water, and shower in the affected areas.