The Naegleria fowleri amoeba is the most common parasite that can infect the brain.
It lives in warm freshwater environments such as lakes, rivers, and hot springs.
It enters the body through the nose when swimming in contaminated water, causing a deadly infection called primary amebic meningoencephalitis (PAM).
PAM symptoms, such as headache, fever, neck stiffness, nausea, vomiting, light sensitivity, hallucinations, seizures, and coma.
Toxoplasma gondii, a protozoan found in cat feces, can infect the brain through consumption of contaminated food or contact with cat feces.
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