Guillain-Barre Syndrome occurs when the myelin sheath on the ending of some nerves is destroyed by an acute inflammatory immune response. The destruction of nerves may cause paralysis or lead to death. In 1976, a swine flu vaccine campaign sparked a fear that the vaccine led to Guillain-Barre Syndrome. In a recently released report, researchers conclude that neither the flu vaccine nor any other vaccine are linked to developing the disease. The Centers for Disease Control funded the study conducted by researchers at the U.S. Centers for Disease Control and Prevention as well as at the Kaiser Permanente Vaccine Study Center. The 13-year study involved 415 patients with Guillain-Barre Syndrome and found that only 25 of those patients had received a vaccine within the six week period prior to developing symptoms of the disease. The conclusion is that the risk factor of developing GBS after receiving a vaccine is very low.