primary amoebic meningoencephalitis

Primary amoebic meningoencephalitis (PAM), also known as naegleriasis, is an almost invariably fatal infection of the brain by the free-living protozoan Naegleria fowleri. Symptoms include headache, fever, nausea, vomiting, a stiff neck, confusion, hallucinations and seizures. Symptoms progress rapidly over around five days with characteristics of both meningitis and encephalitis; becoming a type of meningoencephalitis. Death usually results within one to two weeks of symptom onset.