2/26/2024 0 Comments Red alert 3 registration code 2017![]() Data from clinical laboratories (the percentage of specimens tested that are positive for influenza virus) are used to monitor whether influenza activity is increasing or decreasing.ĬDC antigenically characterizes influenza viruses by hemagglutination inhibition (HI) (H1N1pdm09, H3N2, B/Victoria, and B/Yamagata viruses) or neutralization-based HINT (H3N2 viruses) using antisera that ferrets make after being infected with reference viruses representing the 2023-2024 Northern Hemisphere recommended cell or recombinant-based vaccine viruses. The results of tests performed by clinical laboratories nationwide are summarized below. Viruses known to be associated with recent receipt of live attenuated influenza vaccine (LAIV) or found upon further testing to be a vaccine virus are not included, as they are not circulating influenza viruses. For regional and state level data and age group distribution, please visit FluView Interactive. ![]() However, the distribution of circulating viruses varies by region. ![]() Since Week 40, influenza A(H1N1)pdm09 has been the predominant virus circulating in all regions. Nationally the percentage of respiratory specimens testing positive for influenza in clinical laboratories increased (change of ≥0.5 percentage points) compared to the previous week. CDC is providing updated, integrated information about COVID-19, flu, and RSV activity on a weekly basis.
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