New York City health officials are expected to give an update Thursday on the deadly outbreak of Legionnaires’ disease in Harlem that has killed three people and sickened nearly 100 since late July, as the latest patient counts suggest the numbers may be leveling off.

Health officials in New York City say an outbreak of Legionnaires’ disease in Central Harlem has grown to 90 cases, including three deaths.

A Legionnaires' disease cluster in the Harlem area of New York City has caused three deaths and over 80 people to be sickened. Here's what it is, symptoms and how it's spread.