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> RECORD OBS-0301 | status: PARTIALLY SUBSTANTIATED | filed 2026-07-31
Home > Health > Swine flu vaccine and Guillain-Barré Syndrome

Swine flu vaccine and Guillain-Barré Syndrome

RecordOBS-0301
CategoryHealth/Vaccines
StatusPARTIALLY SUBSTANTIATED
SummaryThe 1976 swine flu vaccination campaign was associated with a small increased risk of Guillain-Barré Syndrome (GBS), about 1 additional case per 100,000 vaccinated people. This led to the suspension of the campaign. The exact cause remains unknown, but the association is accepted by medical authorities.
OriginThe concern arose during the 1976 swine flu outbreak in the United States, when the vaccine was administered to over 40 million people.
Claimed
  • The 1976 swine flu vaccine caused GBS in some recipients.
  • The risk was small but significant enough to halt the vaccination program.
Evidence / consensusThe Institute of Medicine concluded that there was an increased risk of GBS associated with the 1976 swine flu vaccine. This is a documented adverse event, not a conspiracy theory.
> OBSERVER NOTE:
A real vaccine side effect, not a conspiracy. Filed for completeness.

Sources

  1. Historical Vaccine Concerns | Vaccine Safety | CDC

Sources are external and provided for verification. Listing does not imply the Observer endorses their claims.