No one has died in the outbreak on Manhattan’s Upper East Side, but 49 patients have required hospitalization, 34 of whom have gone home, the city health commissioner said.

New York City’s famed Solomon R. Guggenheim Museum was among a number of Manhattan buildings that recently tested positive for the bacteria that causes...

Health officials say a Legionnaires’ disease outbreak in Manhattan’s Upper East Side now counts 60 cases, but new diagnoses are slowing.