Pertussis re-emergence in the post-vaccination era.

BMC Infect Dis · 2013 · PMC3623740 · PMID 23530907

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a decreasing trendno p-value reported

Although a decreasing trend of pertussis cases was observed in adolescents after the introduction of Tdap vaccination, the average incidence among infants younger than 1 year did not change [ 68 ].

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