Viruses, Vol. 15, Pages 1780: Assessing the Intense Influenza A(H1N1)pdm09 Epidemic and Vaccine Effectiveness in the Post-COVID Season in the Russian Federation

Viruses, Vol. 15, Pages 1780: Assessing the Intense Influenza A(H1N1)pdm09 Epidemic and Vaccine Effectiveness in the Post-COVID Season in the Russian Federation Viruses doi: 10.3390/v15081780 Authors: Sominina Danilenko Komissarov Pisareva Fadeev Konovalova Eropkin Petrova Zheltukhina Musaeva Eder Ivanova Komissarova Stolyarov Karpova Smorodintseva Dorosh Krivitskaya Kuznetzova Majorova Petrova Boyarintseva Ksenafontov Shtro Nikolaeva Bakaev Burtseva Lioznov The COVID-19 pandemic had a profound impact on influenza activity worldwide. However, as the pandemic progressed, influenza activity resumed. Here, we describe the influenza epidemic of high intensity of the 2022–2023 season. The epidemic had an early start and peaked in week 51.2022. The extremely high intensity of the epidemic may have been due to a significant decrease in herd immunity. The results of PCR-testing of 220,067 clinical samples revealed that the influenza A(H1N1)pdm09 virus dominated, causing 56.4% of positive cases, while A(H3N2) influenza subtype accounted for only 0.6%, and influenza B of Victoria lineage—for 34.3%. The influenza vaccine was found to be highly effective, with an estimated effectiveness of 92.7% in preventing admission with laboratory-confirmed influenza severe acute respiratory illness (SARI) cases and 54.7% in preventing influenza-like illness/acute respiratory illness ...
Source: Viruses - Category: Virology Authors: Tags: Article Source Type: research