Key takeaways:

Legionnaires’ disease is a severe lung infection that can be treated with antibiotics.

It can be contracted only by breathing in or aspirating contaminated water and is not spread between people.

A cluster of Legionnaires’ disease in the Harlem neighborhood of New York City has sickened at least 22 people since last week, killing one, city health officials announced.

New York City Mayor Eric Adams suggested Thursday night that the cluster may be even larger, writing on X that the city health department was tracking 30 cases of the disease, which is a severe form of pneumonia.

Water cooling towers are a common source of Legionnaires’ disease. Image: Adobe Stock

In a press release announcing the cases, the city health department said it had sampled “all operable cooli

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