The influenza season of 2015–2016 was was dominated by influenza A(H1N1)pdm09, with a small wave of influenza B/Victoria towards the end of the season. Overall, the season had high activity but slightly fewer laboratory-confirmed cases compared to the previous, intense season. The season had a high number of severe cases and significant excess mortality was observed in the 15–64 age group.

This report describes the monitoring systems for influenza in use during the winter season of 2015–2016 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).