This is the fifth report for the 2020-2021 influenza season. As of week 12/2021, only 758 influenza detections across the WHO European Region had been reported to The European Surveillance System (TESSy); 50% type A viruses, with A(H3N2) and A(H1N1)pdm09 being equally represented, and 50% type B viruses, with only 12 having been ascribed to a lineage, 10 B/Victoria and two B/Yamagata.

This is the fourth report for the 2020-2021 influenza season. As of week 8/2021, only 712 influenza detections across the WHO European Region had been reported to TESSy; 51% type A viruses, with A(H3N2) and A(H1N1)pdm09 being equally represented, and 49% type B viruses, with only 10 having been ascribed to a lineage, eight B/Victoria and two B/Yamagata.

This is the third report for the 2020–2021 influenza season. As of week 53/2020, only 415 influenza detections across the WHO European Region had been reported; 50% type A viruses, with A(H3N2) prevailing over A(H1N1)pdm09, and 50% type B viruses with only four having been ascribed to a lineage, three B/Victoria and one B/Yamagata. This represents a 98% drop in detections compared to the same period in 2019, probably due to the COVID-19 pandemic and measures introduced to combat it.

This is the second report for the 2020–2021 influenza season. As of week 48/2020, only 288 influenza detections across the WHO European Region had been reported to TESSy; 52% type A viruses, with A(H3N2) prevailing over A(H1N1)pdm09, and 48% type B viruses with only two having been ascribed to a lineage, both being B/Victoria. This represents a 96% drop in detections compared to the same period in 2019, probably due to the COVID-19 pandemic and measures introduced to combat it.

This is the first report for the 2020–2021 influenza season. As of week 44/2020, only 39 influenza detections across the WHO European Region had been reported to The European Surveillance System (TESSy); 59% type A viruses, with A(H3N2) prevailing over A(H1N1)pdm09, and 41% type B viruses with none having been ascribed to a lineage. This represents a 97% drop in detections compared with the same period in 2019, probably due to the COVID-19 pandemic and measures introduced to combat it.

This is the 10th and final report for the 2019–2020 influenza season. As of week 39/2020, 164 917 influenza detections across the WHO European Region had been reported; 73% type A viruses, with A(H1N1)pdm09 prevailing over A(H3N2), and 27% type B viruses, with 4 480 (98%) of 4 569 ascribed to a lineage being B/Victoria.

ECDC’s influenza virus characterisation reports are published periodically and give an overview of circulating influenza viruses. They provide details on the current vaccine strains, summarise the development of the viruses since the last report, and closely follow the main developments for the ongoing influenza season. Virus characterisation reports are primarily intended for influenza virologists and epidemiologists.

This is the eighth report for the 2019–20 influenza season. As of week 25/2020, 164 883 influenza detections across the WHO European Region had been reported; 73% type A viruses, with A(H1N1)pdm09 prevailing over A(H3N2), and 27% type B viruses, with 4 479 (98%) of 4 568 ascribed to a lineage being B/Victoria.

This is the seventh report for the 2019 2019–20 influenza season. As of week 20 / 16 4 868 influenza detections across the WHO European Region ha have been reported; 73% type A viruses, with A(H1N1)pdm09 prevailing over A(H3N2), and 27% type B viruses, with 4 4 479 (98%) of 4 5 568 ascribed to a lineage being B/Victoria.

ECDC’s influenza virus characterisation reports are published periodically and give an overview of circulating influenza viruses. They provide details on the current vaccine strains, summarise the development of the viruses since the last report, and closely follow the main developments for the ongoing influenza season. Virus characterisation reports are primarily intended for influenza virologists and epidemiologists.