Large Outbreak of Guillain-Barré Syndrome, Peru, 2019.

Outbreaks of Guillain-Barre syndrome (GBS) are uncommon. In May 2019, national surveillance in Peru detected an increase in GBS cases in excess of the expected incidence of 1.2 cases/100,000 population. Several clinical and epidemiologic findings call into question the suggested association between this GBS outbreak and Campylobacter.