![]() Flu VE Network have been published previously (2). associated with currently circulating influenza viruses as well as other influenza viruses that might circulate later in the season. CDC recommends that health care providers continue to administer influenza vaccine to persons aged ≥6 months because influenza activity is ongoing, and the vaccine can still prevent illness, hospitalization, and death * Fever (temperature ≥100☏ ) and a cough or a sore throat without a known cause other than influenza (). Interim VE estimates are consistent with those from previous seasons, ranging from 40%-60% when influenza vaccines were antigenically matched to circulating viruses. Notably, vaccination provided substantial protection (VE = 55% 95% CI = 42%-65%) among children and adolescents aged 6 months-17 years. VE was estimated to be 50% (95% CI = 39%-59%) against influenza B/Victoria viruses and 37% (95% CI = 19%-52%) against influenza A(H1N1)pdm09, indicating that vaccine has significantly reduced medical visits associated with influenza so far this season. Overall, vaccine effectiveness (VE) against any influenza virus associated with medically attended ARI was 45% (95% confidence interval = 36%-53%). Flu VE Network) during October 23, 2019-January 25, 2020. Influenza Vaccine Effectiveness Network (U.S. This interim report used data from 4,112 children and adults enrolled in the U.S. ![]() ![]() During each influenza season, CDC estimates seasonal influenza vaccine effectiveness in preventing laboratory-confirmed influenza associated with medically attended acute respiratory illness (ARI). In the United States, annual vaccination against seasonal influenza is recommended for all persons aged ≥6 months (1). ![]() Activity remains elevated as of mid-February 2020. During the 2019-20 influenza season, influenza-like illness (ILI)* activity first exceeded the national baseline during the week ending November 9, 2019, signaling the earliest start to the influenza season since the 2009 influenza A(H1N1) pandemic.
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