In light of Hillary Clinton's diagnosis, here's everything you need to know about pneumonia

In light of Hillary Clinton's diagnosis, here's everything you need to know about pneumonia

Pneumonia is one of the most common illnesses in the U.S.

The lung infection puts about 1 million adults in the hospital every year, and it can get pretty serious -- about 50,000 die from it.

Hillary Clinton's doctor confirmed Sunday that the Democratic presidential candidate is being treated for the disease. It's unclear how she got infected.

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