Influenza in Sweden – Season 2019–2020
ListenThe 2019–2020 influenza season was mild, and three viruses circulated: influenza A(H3N2), influenza A(H1N1)pdm09, and B/Victoria. The epidemic started in early December (week 49) and continued at low intensity for 16 weeks, with a peak in week 10. Following the implementation of measures to reduce the spread of COVID-19 in weeks 11-12, the number of cases dropped quickly and the epidemic came to an end in week 13 despite an increase in testing for influenza during this period. In the past 20 years, no season has gone from peak activity to end-of-epidemic as fast.
This report describes epidemiological and virological surveillance results for the 2023-2024 influenza season in Sweden. Data are also compared to previous influenza seasons.
Appendices 1, 2 and 3 contain phylogenetic trees for influenza A(H3N2), influenza A(H1N1)pdm09 and influenza B/Victoria, respectively. These are available upon request. Please provide the article number and the title of the report. The registrar will notify you if your document request entails a fee.
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).
Related reading
- Influensa veckorapporter (in Swedish)
- Säsongsrapporter för influensa (in Swedish)