Atypical forms of Guillain-Barré syndrome and H1N1-influenza vaccination.

Recent epidemiological studies established extremely rare incidence of Guillain-Barre syndrome (GBS) after contemporary H1N1-influenza vaccine. We saw five patients with 'atypical' GBS variants that started within four weeks of 2010/2011 H1N1-influenza vaccine. There was no evidence for other etiologies of GBS.