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Influenza virus characterization: summary report, Europe, October 2022 / World Health Organization. Regional Office for Europe;European Centre for Disease Prevention and Control

Tác giả : World Health Organization. Regional Office for Europe;European Centre for Disease Prevention and Control

Nhà xuất bản : World Health Organization. Regional Office for Europe

Năm xuất bản : 2022

Chủ đề : 1. Europe. 2. Infections. 3. Influenza A virus. 4. Influenza B virus. 5. Surveys and Questionnaires. 6. Technical documents.

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Tóm tắt :

The September 2022 characterization report gave a breakdown of influenza detections across the World Health Organization (WHO) European Region reported to TESSy up to week 39/2022 to complete the 2021–2022 season. This is the first report for the 2022–2023 influenza season. As of week 43/2022, 4 052 detections had been reported, resulting from extended late 2021–2022 season influenza activity. Of these detections, 87% were type A viruses, with A(H3N2) dominating (71%) over A(H1N1)pdm09 (29%), and 13% type B of which 105 were ascribed to a lineage, with all being B/Victoria. This represents a 7-fold increase in detections compared to the 2021-2022 season, despite only a modest increase (3%) in the number of samples tested. While there were clear indications of an influenza epidemic in 2021–2022 with the epidemic threshold of 10% positivity within sentinel specimens having been crossed for 17 weeks, following an approximate two year period of low influenza virus circulation due to the COVID-19 pandemic, indications are that there will be an early start to the 2022–2023 season and a more intense epidemic than in 2021–2022.

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https://iris.who.int/handle/10665/364537