Dr. Sejvar is a member of the American Academy of Neurology, the Infectious Disease Society of America and the American Society for Tropical Medicine and Hygiene. He serves on the editorial board of Lancet Neurology, and serves as a manuscript reviewer for numerous international medical journals. His current research focus centers on the epidemiology, pathogenesis, clinical features, and outcomes of infections of the nervous system. He has conducted numerous studies focusing on viral encephalitis, post-infectious nervous system disorders, prion diseases, and infectious etiologies of acute flaccid paralysis. He is currently involved in several international field investigations of unexplained neurologic illnesses; the establishment of surveillance for etiologies of viral encephalitis and infectious acute flaccid paralysis; and developing intervention strategies for prevention and control of neurologic infections. His research also focuses on neurologic adverse events following immunizations. He has authored numerous scientific articles and book chapters, and lectures widely on topics relating to infections of the nervous system.