The European Centre for Disease Prevention and Control (ECDC) periodically publishes influenza characterisation reports, giving an overview of circulating influenza viruses. These reports provide details on current vaccine strains, summarise the development of viruses since the last report and closely follow the main developments for the ongoing influenza season.
On 22 October 2021, the ECDC published the tenth virus characterisation period report for the 2020 to 2021 influenza season. As of week 39 of 2021, 1,276 influenza detections across the World Health Organization (WHO) European Region had been reported. Of these, 60% were type A viruses, with A(H3N2) prevailing over A(H1N1)pdm09, and 40% were type B viruses, with 16 having been ascribed to a lineage, 15 being B/Victoria and one B/Yamagata.
Source: ECDC, 22 October 2021