Underlying chronic medical conditions were reported in 11 (55%) children, whereby 7 of these had more than Information about the influenza vaccination status was available from 17 (85%) patients; none had been vaccinated against influenza. Out of the 11 children from risk groups with chronic underlying disease the vaccination status was not available in 2 (18%) patients, and 1 (9%) child was < 6 months of age and therefore too young to be immunized.