The influenza season of 2014–2015 was long and intense. However, despite genetic drift among the circulating influenza A(H3N2) strains, the season was no more severe than previous intense seasons.

This report describes the monitoring systems for influenza in use during the winter season of 2014–2015 and the results of both epidemiological and virological surveillance. Data are also compared to previous influenza seasons.

The Public Health Agency of Sweden has prepared this report for the World Health Organization (WHO) as part of the agency’s function as a National Influenza Centre (NIC).