A Legionnaires' disease outbreak in New York's Central Harlem neighborhood has now sickened 90 people and caused three deaths, health officials said Tuesday.

New York City health officials are continuing to investigate a cluster of Legionnaires’ disease, a serious bacterial lung infection, where the number of cases has risen to 73, including three deaths.

Three people have died and at least 67 people have been diagnosed with Legionnaires’ disease in a cluster that broke out in New York City last week.