Causality assessment of serious neurologic adverse events following 2009 H1N1 vaccination

► We reviewed 212 neurological SAEs after H1N1 vaccine reported to VAERS. ► We applied modified WHO causality criteria to case reports. ► The most frequent diagnoses were GBS (37%) and seizure (11%). ► Causal assessment resulted in 72 possible, 108 unlikely, and 20 unrelated to vaccine.