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. The regions with the highest percent positivity were Regions 8 (7.4%), 4 (7.0%), 6 (6.5%) and 9 (5.3%). In Region 3 the percentage remained stable compared to the previous week but is trending upwards. Nationally and in HHS Regions 1, 2, 4, 5, 6, 7, 8, 9 and 10, 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, influenza, and RSV activity on a weekly basis. Influenza viruses are among several viruses that contribute to respiratory disease activity.There also are prescription flu antiviral drugs that can be used to treat flu illness those should be started as early as possible and are especially important for higher risk patients.CDC recommends that everyone 6 months and older get an annual flu vaccine.CDC estimates that there have been at least 780,000 illnesses, 8,000 hospitalizations, and 490 deaths from flu so far this season.Of the 133 influenza A viruses subtyped during week 45, 116 (87.2%) were influenza A(H1N1) and 17 (12.8%) were A(H3N2). During week 45, of the 310 viruses reported by public health laboratories, 235 (75.8%) were influenza A and 75 (24.2%) were influenza B.The number of weekly flu hospital admissions continues to increase.Region 3 (Mid-Atlantic) is at its region-specific outpatient respiratory illness baseline and Regions 2, 4, 6, and 9 (New York/New Jersey/Puerto Rico/Virgin Islands, Southeast, South Central, and West Coast) are above their region-specific baselines. Outpatient respiratory illness is above baseline 1 nationally for the second week and is at or above baseline in five of 10 HHS Regions.Seasonal influenza activity continues to increase in most parts of the country, most notably in the South Central, Southeast, and West Coast regions.
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