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Published on: 7/21/2026
Naegleria fowleri, often called the "brain-eating amoeba," is a microscopic organism found in warm freshwater environments like lakes, rivers, and hot springs. Infection occurs when contaminated water enters the nose, allowing the amoeba to travel to the brain. While infections are extremely rare, they are serious and require prompt medical attention. Symptoms can mimic other illnesses, making early recognition critical. If you've been exposed to warm freshwater and are experiencing headaches, fever, nausea, or stiff neck, don't wait to find answers—take a free, instant, online symptom check to better understand your symptoms and confidently navigate your next steps.
Reviewed for medical accuracy: 07/20/2026
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Submit your own QuestionNaegleria fowleri is a type of amoeba that lives in warm freshwater environments. It is often found in places like lakes, rivers, and hot springs, especially during the summer months when the water is warm. This amoeba can cause a rare but severe brain infection if it enters the body through the nose.
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How It Affects People:
While Naegleria fowleri infections are rare, they are very serious. Being aware of the environments where this amoeba is found can help in taking precautions to avoid infection.
(References)
Heggie TW, & Küpper T. (2017). Surviving Naegleria fowleri infections: A successful case .... Travel medicine and infectious disease, 28013053.
Aurongzeb M, Fatima SZ, Hussain SI, Rashid Y, Aziz T, Alhomrani M, et al. (2025). Detection and identification of Naegleria species along .... BMC medical genomics, 39780139.
Heggie TW. (2010). Naegleria fowleri infections in recreational waters. Travel medicine and infectious disease, 20970721.
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