Trivalent inactivated influenza vaccine effective against influenza a(H3n2) variant viruses in children during the 2014/15 season, Japan

Norio Sugaya, M. Shinjoh, C. Kawakami, Y. Yamaguchi, M. Yoshida, H. Baba, M. Ishikawa, M. Kono, Shinichiro Sekiguchi, T. Kimiya, K. Mitamura, M. Fujino, O. Komiyama, Naoko Yoshida, K. Tsunematsu, A. Narabayashi, Y. Nakata, A. Sato, N. Taguchi, H. FujitaM. Toki, M. Myokai, I. Ookawara, T. Takahashi

研究成果: Article査読

22 被引用数 (Scopus)

抄録

The 2014/15 influenza season in Japan was characterised by predominant influenza A(H3N2) activity; 99% of influenza A viruses detected were A(H3N2). Subclade 3C.2a viruses were the major epidemic A(H3N2) viruses, and were genetically distinct from A/New York/39/2012(H3N2) of 2014/15 vaccine strain in Japan, which was classified as clade 3C.1. We assessed vaccine effectiveness (VE) of inactivated influenza vaccine (IIV) in children aged 6 months to 15 years by test-negative case–control design based on influenza rapid diagnostic test. Between November 2014 and March 2015, a total of 3,752 children were enrolled: 1,633 tested positive for influenza A and 42 for influenza B, and 2,077 tested negative. Adjusted VE was 38% (95% confidence intervals (CI): 28 to 46) against influenza virus infection overall, 37% (95% CI: 27 to 45) against influenza A, and 47% (95% CI: -2 to 73) against influenza B. However, IIV was not statistically significantly effective against influenza A in infants aged 6 to 11 months or adolescents aged 13 to 15 years. VE in preventing hospitalisation for influenza A infection was 55% (95% CI: 42 to 64). Trivalent IIV that included A/New York/39/2012(H3N2) was effective against drifted influenza A(H3N2) virus, although vaccine mismatch resulted in low VE.

本文言語English
ジャーナルEurosurveillance
21
42
DOI
出版ステータスPublished - 2016 10 20

ASJC Scopus subject areas

  • 疫学
  • 公衆衛生学、環境および労働衛生
  • ウイルス学

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