Effectiveness of influenza vaccine against laboratory-confirmed influenza, in the late 2011-2012 season in Spain, among population targeted for vaccination.

BMC Infect Dis · 2013 · PMC3848794 · PMID 24053661

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a significant trendno p-value reported

By age group, a decline in influenza VE with time since vaccination was also observed only in patients ≥65 years, although interpretation is limited by small sample size, which likely precluded the observation of a significant trend with time since vaccination [ 37 ].

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