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

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

Fifty-eight people in New York City have been diagnosed with Legionnaires’ disease, a serious bacterial lung infection, and two people have died, according to the city health department.