When outcomes were defined as serological diagnosis of pertussis after the outbreak (anti-PT antibody levels greater than 100 EU/mL) or diagnosed at medical institutions, the RRs were 0.64 (95% CI: 0.16–2.52) and 0.74 (95% CI: 0.21–2.61), respectively; no statistically significant protective effect of complete vaccination were detected using these outcome definitions. This evidence concerns the gene F2 and pertussis.