Health Commissioner Dr. Alister Martin announced Sunday night that the city has not identified anyone with new Legionnaires' symptoms for more than a week, the first official signal that the Upper East Side cluster may have peaked. The confirmed case count stands at 74, with three deaths and eight people still hospitalized.

Health Commissioner Dr. Alister F. Martin announced Sunday night that New York City has identified no residents with new Legionnaires' disease symptoms for more than a week, offering the first official signal that the Upper East Side cluster that has killed three people may have peaked.

"We have identified 74 cases of Legionnaires' disease associated with the cluster, 8 people remain hospitalized, 51 have been discharged from the hospital, and three people have sadly died," Martin said in a statement. "While we continue to investigate cases and closely monitor those in the hospital, we have not identified anyone with new symptoms for more than a week, and we are not seeing any concerning trends in emergency department surveillance data."

The third fatality was confirmed Sunday; the first was announced Friday, July 18, and the second Saturday, July 19. Martin declined to release further details about any of the three victims, citing privacy.

The commissioner reiterated that the city believes the source of exposure "has likely been eliminated due to our aggressive remediation and enforcement efforts" — though investigators have not publicly named a specific building or tower responsible for the cluster. Martin said the department will continue inspecting every cooling tower that tested positive and will hold accountable any owner who fails to comply with public health laws.

The outbreak covers Carnegie Hill and Yorkville in ZIP codes 10028, 10075, and 10128. The CDC estimates that roughly 10 percent of Legionnaires' cases prove fatal; the current cluster's mortality rate of three deaths among 74 confirmed cases is slightly above that baseline. Last year, a Harlem outbreak killed seven and sickened more than 100.

Anyone who has spent time in the three affected ZIP codes and develops flu-like symptoms should seek medical attention, Martin said. Legionnaires' symptoms can appear up to 14 days after exposure.