Lawsuit filed after a deadly Legionnaires' outbreak in Harlem, alleging negligence by construction firms and NYC.

Rainwater left untreated in cooling towers atop city-owned Harlem Hospital fueled the Big Apple’s deadliest Legionnaire’s disease outbreak in a decade, the Rev. Al Sharpton charged Tuesday.

A Legionnaires' disease outbreak in New York's Central Harlem has now caused four deaths and sickened 101 people, New York City health officials confirmed.

Symptoms mimic the flu but escalate quickly. Watch for cough, fever, chills, muscle aches, shortness of breath, and sometimes headache, confusion, diarrhea, or nausea. Symptoms usually show up 2–14 days after exposure.