In the intensive care unit, the use of continuous electroencephalography (cEEG) in children with altered mental status often results in the detection of non-convulsive seizures (NCS). Children with influenza can occasionally display altered mental status, but the prevalence of NCS in children with influenza with altered mental status is yet to be determined. This study determined the prevalence of NCS in pediatric patients with altered mental status associated with influenza A(H1N1)pdm09 infection.