The New York City Health Department is currently responding to a cluster of Legionnaires' disease that has infected at least 67 people, up from 22 cases just a week ago.

As of Aug. 5, the outbreak has claimed three lives, reporting from USA Today shows.

Legionnaires' disease is typically linked to water and plumbing systems, the NYC Health Department said in a statement . The department has said that the outbreak is “not an issue with any building's plumbing system.”

And while the outbreak is concentrated in the neighborhood of Central Harlem, in recent weeks cases have also been identified in Michigan .

Here's what to know:

What is Legionnaires' disease?

Caused by bacteria, Legionnaires' disease is a type of pneumonia. Legionella, the bacterium that causes the illness, thrives

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