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

A Legionnaires' disease cluster in the Harlem area of New York City has caused three deaths and 90 people to be sickened. Here's what it is, symptoms and how it's spread.

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.