Naegleria fowleri: The Brain-Eating Amoeba

It's often called a brain-eating amoeba, and that's not much of an exaggeration.

By Avery Hurt
Oct 3, 2023 6:00 PM
Brain-eating amoeba infection, naegleriasis. Trophozoite form of the parasite Naegleria fowleri
(Credit:Kateryna Kon/Shutterstock)

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A creature that lurks in lakes and ponds, crawls up your nose and eats your brain. Sounds like something out of science fiction, right? Nope, it's all too real.

The organism that does all this damage is called Naegleria fowleri. Find out why this sneaky predator is alarming to both scientists and the general public.

What Is Naegleria fowleri?

Naegleria fowleri is a microscopic amoeba that lives in warm freshwater, such as lakes, ponds and rivers. There are many species of Naegleria, and most of them do little or no harm to humans.

They eat bacteria and other detritus, explains Dennis Kyle, professor of infectious diseases and director of the Center for Tropical and Emerging Global Diseases at the University of Georgia.

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