We describe a case of Baylisascaris procyonis roundworm infection in a child in Washington, USA, with autism spectrum disorder. Environmental assessment confirmed nearby raccoon habitation and B. procyonis eggs. B. procyonis infections should be considered a potential cause of human eosinophilic meningitis, particularly among young children and persons with developmental delays.
Keywords: Ascaridida infections; Ascaridoidea; Baylisascaris procyonis; United States; Washington; albendazole; autism spectrum disorder; case report; child; eosinophilia; feces; intellectual disability; larva migrans; meningitis/encephalitis; parasites; pica; raccoons; roundworm; zoonoses.