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ECB-ART-52952
MMWR Morb Mortal Wkly Rep 2024 Feb 29;738:168-174. doi: 10.15585/mmwr.mm7308a3.
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Interim Estimates of 2023-24 Seasonal Influenza Vaccine Effectiveness - United States.

Frutos AM , Price AM , Harker E , Reeves EL , Ahmad HM , Murugan V , Martin ET , House S , Saade EA , Zimmerman RK , Gaglani M , Wernli KJ , Walter EB , Michaels MG , Staat MA , Weinberg GA , Selvarangan R , Boom JA , Klein EJ , Halasa NB , Ginde AA , Gibbs KW , Zhu Y , Self WH , Tartof SY , Klein NP , Dascomb K , DeSilva MB , Weber ZA , Yang DH , Ball SW , Surie D , DeCuir J , Dawood FS , Moline HL , Toepfer AP , Clopper BR , Link-Gelles R , Payne AB , Chung JR , Flannery B , Lewis NM , Olson SM , Adams K , Tenforde MW , Garg S , Grohskopf LA , Reed C , Ellington S , CDC Influenza Vaccine Effectiveness Collaborators .


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In the United States, annual influenza vaccination is recommended for all persons aged ≥6 months. Using data from four vaccine effectiveness (VE) networks during the 2023-24 influenza season, interim influenza VE was estimated among patients aged ≥6 months with acute respiratory illness-associated medical encounters using a test-negative case-control study design. Among children and adolescents aged 6 months-17 years, VE against influenza-associated outpatient visits ranged from 59% to 67% and against influenza-associated hospitalization ranged from 52% to 61%. Among adults aged ≥18 years, VE against influenza-associated outpatient visits ranged from 33% to 49% and against hospitalization from 41% to 44%. VE against influenza A ranged from 46% to 59% for children and adolescents and from 27% to 46% for adults across settings. VE against influenza B ranged from 64% to 89% for pediatric patients in outpatient settings and from 60% to 78% for all adults across settings. These findings demonstrate that the 2023-24 seasonal influenza vaccine is effective at reducing the risk for medically attended influenza virus infection. CDC recommends that all persons aged ≥6 months who have not yet been vaccinated this season get vaccinated while influenza circulates locally.

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