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Parasitic

A parasitic worm is often assumed to be the cause of eosinophilic meningitis when there is a predominance of eosinophils (a type of white blood cell) found in the cerebrospinal fluid. The most common parasites implicated are Angiostrongylus cantonensis, Gnathostoma spinigerum, Schistosoma, as well as the conditions cysticercosis, toxocariasis, baylisascariasis, paragonimiasis, and a number of rarer infections and noninfective conditions.

Rarely, free-living parasitic amoebae can cause naegleriasis, also called amebic meningitis, a type of meningoencephalitis where not only the meninges are affected but also the brain tissue.