Interim Estimates of 2019–20 Seasonal Influenza Vaccine Effectiveness - United States, February 2020

The interim estimates of the effectiveness of the 2019-20 seasonal influenza vaccine in the US is discussed. 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 inf...

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Bibliographic Details
Published in:MMWR. Morbidity and Mortality Weekly Report 2020, Vol.69 (7), p.177-182
Main Authors: Dawood, Fatimah S, Chung, Jessie R, Kim, Sara S, Zimmerman, Richard K, Nowalk, Mary Patricia, Jackson, Michael L, Jackson, Lisa A, Monto, Arnold S, Martin, Emily T, Belongia, Edward A, McLean, Huong Q, Gaglani, Manjusha, Dunnigan, Kayan, Foust, Angie, Sessions, Wendy, DaSilva, Juliana, Le, Shoshona, Stark, Thomas, Kondor, Rebecca J, Barnes, John R, Wentworth, David E, Brammer, Lynnette, Fry, Alicia M, Patel, Manish M, Flannery, Brendan
Format: Report
Language:English
Subjects:
Age groups
Enrollments
Estimates
Ethnicity
Illnesses
Immunization
Infections
Influenza
Influenza A
Medical laboratories
Orthomyxoviridae
Pandemics
Patients
Seasons
Teenagers
Vaccination
Vaccines
Viruses
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Summary:The interim estimates of the effectiveness of the 2019-20 seasonal influenza vaccine in the US is discussed. 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. Activity remains elevated as of mid-February 2020. In the US, annual vaccination against seasonal influenza is recommended for all persons. During each influenza season, CDC estimates seasonal influenza vaccine effectiveness in preventing laboratory-confirmed influenza associated with medically attended acute respiratory illness (ARI). This interim report used data from 4,112 children and adults enrolled in the US Influenza Vaccine Effectiveness Network during October 23, 2019-January 25, 2020. Overall, vaccine effectiveness (VE) against any influenza virus associated with medically attended ARI was 45%. CDC recommends that health care providers continue to administer influenza vaccine because influenza activity is ongoing, and the vaccine can still prevent illness, hospitalization, and death associated with currently circulating influenza viruses as well as other influenza viruses that might circulate later in the season.
ISSN:0149-2195
1545-861X