Association Between Adverse Events of Special Interesta and Pandemic (H1N1) 2009 Monovalent Vaccine Adjuvanted With MF59®, by Age Group and Risk Interval, November 1, 2009–February 28, 2010.

Abbreviation: CNS, central nervous system; IRR, incidence rate ratio; CI, confidence interval.aNo cases of Guillain-Barré syndrome, demyelinating disease of the CNS, and encephalitis/myelitis occurred among recipients of MF59®-adjuvanted vaccine.bRisk (exposed) periods were days after each pandemic (H1N1) 2009 monovalent vaccination. Control (unexposed) periods were postvaccination time period outside the exposed periods.cAnalyses were performed if at least three exposed cases were available.