This report describes epidemiological and virological surveillance results for the influenza season of 2022–2023 in Sweden. Data are also compared to previous influenza seasons. The national investigation of severe complications of influenza B infection among adolescents is described in Appendix 1.
Appendices 2, 3 and 4 contain phylogenetic trees for each virus subtype or lineage and are available upon request, please email firstname.lastname@example.org.
The report has been prepared for the World Health Organization (WHO) as part of the Public Health Agency of Sweden’s function as a National Influenza Centre (NIC).
Influensa veckorapporter (in Swedish)