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Guillain-Barré Syndrome (GBS) is an acute immune-mediated inflammatory polyradiculoneuropathy that may follow triggering events such as infections and vaccination. The relative risk for GBS (“extensive” paresis or paralysis) after administration of the 1976–1977 inactivated swine influenza A (H1N1) vaccine was significantly increased, ranging from 4.0 to 7.8 for the 6-week period following vaccination. Studies of influenza vaccination in subsequent years, however, have found either no increase in risk (for the years 1978–1988; N Engl J Med 1981; 304:1557 and Am J Epidemiol 1991; 133:952) or an increase of about one case of GBS per million vaccinations (for 1992–1994; N Engl J Med 1998; 339:1797). To assess the potential association between …