It sounds like something out of a horror movie — a microscopic “brain-eating amoeba” lurking in water, waiting to strike. While rare, infections from Naegleria fowleri, often dubbed the “brain-eating amoeba,” are real and can be deadly. But before you swear off swimming forever, let’s separate fear from facts—and talk about how to stay safe.
Naegleria fowleri is a naturally occurring amoeba found in warm freshwater, such as lakes, rivers, and hot springs, especially during the summer months when temperatures are high. Contrary to popular belief, you can’t get infected by drinking contaminated water. The danger comes when water containing the amoeba enters your nose, allowing it to travel to the brain and cause a rare but severe infection called primary amebic meningoencephalitis (PAM).
Infections are extremely rare. Millions swim in lakes and rivers every year without issue. But knowing how to minimize risk is smart:
- Avoid jumping or diving into warm freshwater, especially in southern states where cases are more common.
- Use nose clips or keep your head above water when swimming in warm freshwater or hot springs.
- Never stir up sediment in shallow, warm areas where amoebas thrive.
It’s important to remember that while deadly amoebas make headlines, the actual risk is low with proper precautions. Awareness—not panic—is your best defense. So go ahead, enjoy the water this summer—but keep your nose protected and stay informed.