Source httpswwwcdcgovfluprofessionalsvaccinationeffectivenessstudieshtm 20202021 flu vaccine effectiveness was not estimated due to low flu virus circulation during the 20202021 flu season ID: 999241
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1. Effectiveness of Seasonal Flu Vaccines from the 2005 – 2021 Flu SeasonsSource: https://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm*2020-2021 flu vaccine effectiveness was not estimated due to low flu virus circulation during the 2020-2021 flu season.
2. Adjusted Vaccine Effectiveness Estimates For Influenza Seasons from 2005 – 2021Influenza SeasonReferenceStudy Site(s)No. of PatientsAdjusted Overall VE (%)95% CI2005-06Belongia 2009WI34621-52, 592006-07Belongia 2009WI8715222 ,702007-08Belongia 2011WI1,9143722, 492008-09UnpublishedWI, MI, NY, TN6,7134130, 502009-10Griffin 2011WI, MI, NY, TN6,7575623, 752010-11Treanor 2011WI, MI, NY, TN4,7576053, 662011-12Ohmit 2014WI, MI, PA, TX, WA4,7714736, 562012-13McLean 2014WI, MI, PA, TX, WA6,4524943, 552013-14Gaglani 2016WI, MI, PA, TX, WA5,9995244, 592014-15Zimmerman 2016WI, MI, PA, TX, WA9,3111910, 272015-16Jackson 2017WI, MI, PA, TX, WA6,8794841, 552016-17Flannery 2018 WI, MI, PA, TX, WA 7,41040 32, 462017-18Rolfes 2019 WI, MI, PA, TX, WA8,43638 31, 432018-19Flannery 2020WI, MI, PA, TX, WA10,0122921, 352019-20Tenforde 2021WI, MI, PA, TX, WA8,8453932, 442020-2021*Source: https://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm*2020-2021 flu vaccine effectiveness was not estimated due to low flu virus circulation during the 2020-2021 flu season.