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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.

Influenza activity started in week 45/2019 and returned to baseline levels in week 13/2020, earlier than previous seasons. Influenza viruses circulated at high levels between weeks 52/2019 and 10/2020 (based on increased proportions (40% and above) of sentinel specimens testing positive for influenza viruses). This is comparable to previous seasons.

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.

This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 3-9 May 2020 and includes updates on COVID-19, Ebola virus disease, seasonal influenza, measles and dengue.

This issue of the CDTR (Communicable Disease Threats Report) covers the period from 19-25 April 2020 and includes updates on COVID-19, dengue fever, Ebola virus disease and seasonal influenza.