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Table 2 Pertussis confirmation rates by vaccination status in different periods and age groups, Brazil, 2007–2014

From: Increasing incidence of pertussis in Brazil: a retrospective study using surveillance data

   Confirmation rates
  Notified cases (N) Fully vaccinated Incompletely vaccinated or unvaccinated p-value
Period/Age group
Jan 2007 – May 2012     
 7–15 months 1797 379/1292 (29,3 %) 212/505 (42 %) <0.001
 16–48 months 3319 809/2964 (27.3 %) 132/355 (37.2 %) <0.001
Period /Age group
Jun 2012–Dec 2014     
 7–15 months 3635 719/2722 (26.4 %) 303/913 (33.2 %) <0.001
 16–48 months 9283 2659/8548 (31.1 %) 261/735 (35.5 %) 0.013