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.

Legionnaires' disease has killed at least five in New York and sickened many more, but its risk factors are widespread and growing across the US.

A sixth person has died from Legionnaires’ disease connected to the outbreak in Central Harlem, health officials announced on Wednesday. The patient died outside of New York City earlier this month. The city’s health department reported that 111 people have been affected by the disease,

A Legionnaires' outbreak in Harlem has prompted concerns about NYC's health oversight after a decline in cooling tower inspectors, despite funding increases. Former Governor Cuomo seeks an independent probe into the city's handling of the crisis.