[Source: Journal of Infectious Diseases, full page: (LINK). Abstract, edited.]
Remaining effect of influenza vaccines received in prior seasons
Iván Martínez-Baz, Ana Navascués, Itziar Casado, Aitziber Aguinaga, Carmen Ezpeleta, Jesús Castilla
The Journal of Infectious Diseases, jiz266, https://doi.org/10.1093/infdis/jiz266
Published: 20 May 2019
This study evaluates the remaining effect of influenza vaccines received in the 5 prior seasons. During 7 influenza seasons 8933 patients were enrolled and 47% were confirmed for influenza. As compared to unvaccinated individuals in the current and 5 prior seasons, vaccination was protective when the last dose had been received in the current season (40%; 95%CI, 32-47), and one (42%; 95%CI, 27-54), 2-3 (35%; 95%CI, 16-49) or 4-5 seasons before (31%; 95%CI, 4-51). This effect lasted less in the elderly and chronic patients. On average, several recent prior doses were as protective as current season vaccination.
influenza, influenza vaccine, vaccination history, repeated vaccination, vaccine effectiveness, case-control study, test-negative study
Topic: influenza – influenza vaccines – vaccination – vaccines – elderly
Issue Section: Brief Report
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Keywords: Seasonal Influenza; Vaccines.