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In 1976, a type of influenza (swine flu) vaccine was associated with Guillain-Barre Syndrome (GBS). Since then, flu vaccines have not been clearly linked to GBS. GBS is a rare problem in which a person’s own immune system damages the nerves, causing muscle weakness and sometimes paralysis. If there is a risk of GBS from current flu vaccines, it would be no more than one or two cases per million people vaccinated.  This is much lower than the risk of complications and death from influenza. Influenza can also cause GBS. It is not fully known what causes GBS.  About two-thirds of people who get GBS do so after they have been sick with diarrhea or a lung or sinus illness.