International Guillain-Barré Syndrome Outcome Study

Inclusion Criteria: * Fulfil diagnostic criteria for GBS of National Institute of Neurological Disorders and Stroke (NINDS). Patients with Miller Fisher syndrome and all other variants of GBS, including overlap syndromes, can be included. * Inclusion of all males and females of all ages, independent of disease severity and treatment * Inclusion within two weeks of onset of weakness * Inclusion of patients transferred from another hospital if the stay in the first hospital was less than one week * Opportunity to conduct a follow-up of at least one year * Informed consent of patient or, in case of children, of parents or legal guardians Exclusion Criteria: * There are no exclusion criteria