No deaths have been linked to the outbreak so far, but the city Department of Health is urging New Yorkers — particularly those who live in the area — to stay vigilant for flu-like symptoms. Legionnaires’ disease is a severe form of pneumonia that can develop when someone inhales water vapor contaminated with Legionella bacteria.

Three more cases of Legionnaire’s disease have been identified in an outbreak city officials are investigating in Central Harlem, one of several clusters that have plagued the area in recent years. A total of eight people since Friday have been confirmed to have contracted the life-threatening disease,