Guillain-Barré syndrome after coronavirus disease 2019 vaccine: A temporal association.

Background: Guillain-Barré syndrome (GBS) is an acute monophasic immune-mediated polyradiculoneuropathy, preceded by gastrointestinal or respiratory infections in up to two-thirds of patients. On rare occasions, people develop GBS after vaccination, but no causal association has been proven. In the current coronavirus disease 2019 (COVID-19) pandemic, some cases have been reported associating COVID-19 vaccine with GBS.