Three people are now dead after being exposed to a brain-eating amoeba that lives in fresh water around the world.

Courtney Nash, 16, has become the third victim of the Naegleria Fowleri, a waterborne amoeba that swims up the nose and enter the brain. Nash died of a brain infection last week after going for a swim in a Florida river.

Two others also died a similar death.

One person in Louisiana and another in Virginia succumb to the deadly amoeba this year. One of them was a 9-year-old Virginia boy, who went to a fishing day camp the week before he died, according to reports.

"In all likelihood, we're never going to pinpoint exactly where this amoeba was acquired," said Dr. Keri Hall, Virginia state epidemiologist, told the Richmond Times-Dispatch.