{Reference Type}: Case Reports {Title}: Baylisascaris procyonis Roundworm Infection in Child with Autism Spectrum Disorder, Washington, USA, 2022. {Author}: Lipton BA;Oltean HN;Capron RB;Hamlet A;Montgomery SP;Chancey RJ;Konold VJL;Steffl KE; {Journal}: Emerg Infect Dis {Volume}: 29 {Issue}: 6 {Year}: 2023 06 {Factor}: 16.126 {DOI}: 10.3201/eid2906.230290 {Abstract}: 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.