A Legionnaires' disease outbreak in Harlem is blamed for at least three deaths, and NYC officials are warning to watch out for the symptoms.

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.

Mohamed Hamdy Yassin, M.D., an infectious disease specialist with University of Pittsburgh Medical Center who sees about 15 to 20 cases of Legionnaires’ disease each year, says