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 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.
On 13 May 2020, the ECDC published the sixth virus characterisation report for the 2019-20 influenza season. As of week 18/2020, a total of 162,345 influenza detections across the World Health Organization (WHO) European Region had been reported. Of these, 73% were type A viruses, with A(H1N1)pdm09 prevailing over A(H3N2), and 27% were type B viruses, with 4,418 (98%) of 4,505 ascribed to a lineage being B/Victoria.
Source: ECDC, 13 May 2020