Remaining Effect of Influenza Vaccines Received in Prior Seasons.
prospective_cohort · Level II
Where this comes from
- Record sourced from PubMed, PMID 31107953.
- Also identified by DOI 10.1093/infdis/jiz266.
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Abstract
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. Compared with 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% confidence interval {CI}, 32%-47%]), and 1 (42% [95% CI, 27%-54%]), 2-3 (35% [95% CI, 16%-49%]), or 4-5 seasons (31% [95% CI, 4%-51%]) prior. This effect lasted for fewer seasons in the elderly and in patients with chronic conditions. On average, several recent prior doses were as protective as current-season vaccination.
Medical subject headings
- Influenza Vaccines
- Influenza, Human
- Seasons
- Vaccination