Risk of convulsions in children after monovalent H1N1 (2009) and trivalent influenza vaccines: A database study

► The risk of convulsions in the week after influenza vaccination was assessed. ► No increased risk was found after trivalent influenza vaccine. ► No increased risk was found after single dose adjuvanted monovalent H1N1 vaccine. ► Signal of an elevated risk after the second dose of monovalent H1N1 influenza vaccine. ► Extension of TIV to healthy children may reduce convulsions by preventing influenza.