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Distribution by onset month of GBS diagnosed between February 2019 and 2020 (retrospective series) and GBS diagnosed between March 2020 and 2021 (prospective series). GBS-C+ (red bars) clusters in March 2020 and November 2020, coinciding with the pandemic waves in our country. Red bars: GBS-C+, blue bars: GBS-C−. GBS = Guillain-Barrè Syndrome; GBS-C+ = post–COVID-19 GBS; GBS-C−: non–COVID-GBS.
