The dog days of summer are still upon us, and with that comes an increase in the usage of air conditioning systems.

While it is very rare to get sick from a portable or window-installed air conditioning unit, there have been recent cases of Legionnaires’ disease stemming from central air conditioning systems.

The most recent cases occurred in Harlem in New York City, where six people died and 113 others reported having the illness as of Tuesday, according to the NYC Health Department.

Here’s what you need to know about the pneumonia-like illness that can be caused by central air conditioning systems.

What causes Legionnaires’ disease?

According to the Centers for Disease Control and Prevention , Legionnaires’ disease is a severe form of pneumonia or lung infection caused by the Le

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