A fourth person has died in connection with a Legionnaires’ disease outbreak in New York City. Health officials disclosed the latest death Thursday as they revealed that some cooling towers tested positive for the bacteria in some city-run buildings.

A fourth person has died amid the Legionnaires’ disease outbreak in central Harlem, according to the New York City Department of Health. The outbreak that began in late July has since spread to 99 confirmed cases as of Thursday, with four deaths and 17 hospitalizations. Those who have died have not been identified.

Nearly 60 people have become sick and two have died in an outbreak of Legionnaires' disease in New York City. Health officials there issued an alert on July 30 warning residents of Central Harlem who have flu-like symptoms to see a health care provider immediately.