Influenza Vaccine Effectiveness in the United States During the 2016-2017 Season.

ABSTRACT:

Background

In recent influenza seasons, the effectiveness of inactivated influenza vaccines against circulating A(H3N2) virus has been lower than against A(H1N1)pdm09 and B viruses, even when circulating viruses remained antigenically similar to vaccine components.

Methods

During the 2016-2017 influenza season, vaccine effectiveness (VE) across age groups and vaccine types was examined among outpatients with acute respiratory illness at 5 US sites using a test-negative design that compared the odds of vaccination among reverse transcription polymerase chain reaction-confirmed influenza positives and negatives.

Results

Among 7083 enrollees, 1342 (19%) tested positive for influenza A(H3N2), 648 (9%) were positive for influenza B (including B/Yamagata, n = 577), and 5040

SUBMITTER: Flannery B 

PROVIDER: S-EPMC6522684 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature