In the summer of 2007, 6 fatal cases of infection occurred in the United States, all young males (Medscape)
Human and animal 
Transmission / Exposure Route
Naegleria fowleri infects people by entering the body through the nose. Person-to-person transmission is very rare.
Case Fatality Ratio
In the summer of 2007, 6 fatal cases of infection occurred in the United States, all young males
Burden of Disease
The risk of Naegleria fowleri infection is very low. There have been 32 reported infections in the U.S. in the 10 years from 2001 to 2010.
Duration of Infectiousness and disease
Excretion Rates (see Exposure)
A microscopic ameba (single-celled living organism) that can cause a very rare, but severe, infection of the brain. Only one species (type) of Naegleria infects people: Naegleria fowleri.