Guillain-barré largely predates the clot shot, "Georges Guillain, médecin (1876-1961)." "Originally, and until the end of the 1930s, Guillain and Barré insisted on the favorable evolution of the disease, to make it the second determining criterion for diagnosis8, hence a historical reputation for benignity which, wrongly, may still persist today 9. Since the middle of the 20th century, favorable evolution is no longer a diagnostic criterion. After 1976, **following a series of cases linked to vaccination against a threat of swine flu** in the United States, the diagnostic criteria were subject to international standardization10, periodically reassessed. This makes it possible, under the simplified term "Guillain-Barré syndrome", to group together many forms of acute extensive paralysis, formerly or newly described, including severe forms."