One person has died and nearly two dozen others are sick in a Legionnaires' disease cluster in New York City, officials said.

The New York City Department of Health said July 30 that it is investigating the cluster, which has left one dead and 22 others sick in Central Harlem.

Legionnaires' disease is a severe pneumonia caused by a type of bacteria called Legionella, according to the CDC .

The risk to most people is low, and the disease is not contagious, the agency said. Some people, including those older than 50, smokers or those with a weakened immune system, are at higher risk for the disease, according to NYC Health.

NYC Health said it believes the source of the bacteria causing this cluster is a cooling tower in the area. Here's what to know.

Where is NYC Legionnaires' cl

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