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Postinfectious neuroinflammation has been implicated in multiple models of acute-onset obsessive-compulsive disorder including Sydenham chorea (SC), pediatric acute-onset neuropsychiatric syndrome (PANS), and pediatric autoimmune neuropsychiatric disorders associated with streptococcal infection (PANDAS). These conditions are associated with a range of autoantibodies which are thought to be triggered by infections, most notably group A streptococci (GAS). Based on animal models using huma sera, these autoantibodies are thought to cross-react with neural antigens in the basal ganglia and modulate neuronal activity and behavior. As is true for many childhood neuroinflammatory diseases and rheumatological diseases, SC, PANS, and PANDAS lack clinically available, rigorous diagnostic biomarkers and randomized clinical trials. In this review article, we outline the accumulating evidence supporting the role neuroinflammation plays in these disorders. We describe work with animal models including patient-derived anti-neuronal autoantibodies, and we outline imaging studies that show alterations in the basal ganglia. In addition, we present research on metabolites, which are helpful in deciphering functional phenotypes, and on the implication of sleep in these disorders. Finally, we encourage future researchers to collaborate across medical specialties (e.g., pediatrics, psychiatry, rheumatology, immunology, and infectious disease) in order to further research on clinical syndromes presenting with neuropsychiatric manifestations. [ABSTRACT FROM AUTHOR]

OBJECTIVE. Pediatric acute-onset neuropsychiatric syndrome (PANS) includes pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections and involves sudden-onset neuropsychiatric symptoms, including obsessions, compulsions, sensory difficulties, and dysgraphia after infection or other triggers. Our objective was to identify problems with areas of occupation, body functions, and performance skills during exacerbations. METHOD. In this online retrospective study, based on the Occupational Therapy Practice Framework: Domain and Process (2nd ed.), we surveyed parents of 111 children with PANS. RESULTS. Activities of daily living, math, handwriting, extracurricular activities, free play, organized sports, community and family social participation, higher level thinking, attention, memory, sequencing, emotional coping, and energy and drive were commonly affected during exacerbations. During exacerbations, children often required assistance and adaptation to remain functional or were unable to function at a typical level. CONCLUSION. Children with PANS present with pervasive occupational performance needs during exacerbation. Children and families may benefit from accommodations to maximize function during this turbulent period. [ABSTRACT FROM AUTHOR]