Cases of Legionnaires’ disease in New York City reached 67 on Tuesday, as the growing outbreak in the city has resulted in three deaths, though the New York City Department of Health says the risk to most people remains low.

Legionnaires’ disease cases reached 67 by Tuesday. (Photo by Gary Hershorn/Getty Images)

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Key Facts

The NYC Health Department is investigating the cases of Legionnaires’ in Central Harlem, specifically in the zip codes 10027, 10030, 10035, 10037, and 10039.

Legionnaires’ disease, a form of pneumonia, is caused by bacteria (Legionella) that grows in warm water, with cooling towers, showers and hot tubs among the sources, according to the health department, which noted residents in the affected zip codes can still drink tap water, bathe, shower, cook and use their air conditioners.

People who inhale mist containing Legionella can get sick, but most people exposed to it do not develop Legionnaires’ disease, which is not contagious between people and cannot be contracted by drinking water.

The NYC Health Department has said the outbreak is not linked to any building’s plumbing system.

This is a developing story. Check back for updates.