A sixth person has died in the Upper East Side Legionnaires’ disease outbreak, according to New York City health officials. The health department says 90 people have been sickened since the outbreak was first identified in early July.

Officials also said six people remain hospitalized. The latest update shows the outbreak is still a serious public health concern for residents in and around the Upper East Side.

Legionnaires’ disease is a severe form of pneumonia caused by bacteria that can spread through contaminated water droplets. Outbreaks often lead to urgent inspections and cleanup efforts as health authorities work to identify possible sources and limit further exposure.

The new death toll adds to growing concern as the city continues monitoring cases tied to the Upper East Side cluster. Health officials have notaled the total number of illnesses and hospitalizations as they track the outbreak’s impact.