CDC Releases Preliminary Report of Surveillance for GBS in 10 States

June 16, 2010

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Throughout the 2009–2010 H1N1 influenza season, CDC's Emerging Infections Program (EIP) conducted active surveillance for Guillain-Barré syndrome (GBS) as a part of 2009 H1N1 vaccine safety monitoring in 10 EIP regions nationwide. The CDC has released a report of the preliminary findings from EIP surveillance which indicate a small but elevated association between GBS and H1N1 vaccination, which if confirmed would correspond to approximately one additional GBS case per million vaccinations. Other vaccine monitoring systems have not found a corresponding link between H1N1 vaccine and GBS. Read the full report here.