A deadly Legionnaires' disease outbreak in New York City has set health and community leaders on a campaign to educate the public on ways to prevent the bacteria from growing and spreading.

A recent cluster of Legionnaires’ disease cases in New York City has once again raised alarms in Georgia about this rare illness, recalling the state’s outbreak in 2019. The New York Times reported the Harlem outbreak is linked to contaminated cooling towers in 11 buildings and 70 people have been diagnosed with three deaths reported so far.

Here’s what to know about Legionnaires’ disease, how it spreads, and the East Harlem cooling tower outbreak under investigation.