Effect of Current-Season-Only Versus Continuous Two-Season Influenza Vaccination on Mortality in Older Adults: A Propensity-Score-Matched Retrospective Cohort Study.

reported that among participants vaccinated in the current season but not in the previous 10 seasons, VE (VE = 34%, 95% CI: 9–52%) was higher compared to those vaccinated in 1–3 previous seasons (VE = 26%, 95% CI: 13–37%), 4–6 previous seasons (VE = 24%, 95% CI: 15–33%), 7–8 previous seasons (VE = 13%, 95% CI: 2–22%), or 9–10 previous seasons (VE = 7%, 95% CI: −4–16%), with a significant trend ( p = 0.001) [ 30 ].

also in 9,775 other papers