The underlying mechanism of Guillain-Barré syndrome in a young patient suffered from Japanese encephalitis virus infection: a case report.

Background: The presentation of Guillain–Barré syndrome (GBS) caused by Japanese encephalitis virus (JEV) is uncommon, although clusters of GBS cases were observed in China in 2018. The underlying mechanism is unclear, particularly in individuals vaccinated against Japanese encephalitis in childhood. Case presentation: We report a patient with acute flaccid paralysis involving four extremities and respiratory muscles, while magnetic resonance imaging of the brain and spine were standard. Electrophysiological examination displayed slowed motor nerve conduction speed and reduced evoked velocity amplitude. GBS was finally considered which was related to JEV infection verified by positive anti-JEV immunoglobulin M antibody and positive immunoglobulin G antibody in the serum. Unfortunately, the patient refused intravenous immunoglobulin and declined the use of mechanical ventilation again. He voluntarily withdrew from the hospital and died on the 36th day after the onset of illness. We also performed a review of previously reported related cases and discussed the underlying mechanism. Conclusion: JEV infection-associated GBS is unusual. We should pay attention to the atypical manifestations of JEV infection and explore possible pathogenesis in particular individuals. [ABSTRACT FROM AUTHOR]