Summer is when families are most at risk for brain-eating amoeba. Infections are rare, almost always deadly. How to go swimming but stay safe.

The amoeba lurks in pools ... According to the CDC, Naegleria fowleri has three stages in its life cycle: cyst, trophozoites and flagellated forms. It's only active in the trophozoite stage.

Infectious stage for humans are trophozoites and flagellate form. (Getty Images) According to the CDC, Naegleria fowleri, commonly known as the “brain-eating amoeba,” is a one-celled organism ...