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NYC Declares Upper East Side Legionnaires Cluster Over After 92 Cases and 7 Deaths

Remediation of cooling towers that tested positive for live Legionella ended the elevated risk and whole‑genome sequencing is due to identify the source by the end of August.

Overview

  • The Health Department said Friday it could close the response phase after two weeks passed with no new cluster-linked illnesses following an investigation that began in early July.
  • Ninety-two people have tested positive and seven have died, with five patients still hospitalized as of July 30.
  • Officials tested about 183 cooling towers at 160 buildings, found live Legionella by culture in 59 towers at 58 buildings, and ordered all culture-positive systems to be drained, cleaned, and disinfected.
  • Inspections uncovered more than 110 violations including an unregistered tower at 300 East 83rd Street that was cited 11 times and fined $11,000, and the city plans further enforcement reviews and a City Council oversight hearing in September.
  • Whole‑genome sequencing is underway to match patient and environmental samples with results expected by the end of August, and investigators say findings will guide any targeted enforcement or policy changes.