WATCH: What to know about rare, brain-eating amoeba Naegleria fowleri

Most infections with Naegleria fowleri occur when people swim in contaminated water and submerge their heads, causing the amoeba to enter the nose.

​Most infections with Naegleria fowleri occur when people swim in contaminated water and submerge their heads, causing the amoeba to enter the nose.   Most infections with Naegleria fowleri occur when people swim in contaminated water and submerge their heads, causing the amoeba to enter the nose.