Retrospective cohort study shows pertussis cases in vaccinated children, suggesting need for enhanced surveillance.
The occurrence of cases several years after vaccination highlights the importance of continued surveillance to strengthen pertussis prevention strategies. Pertussis cases occurring within 5 years of wP vaccination warrant further population-based and molecular studies to evaluate potential factors such as waning immunity or antigenic changes in circulating B. pertussis strains.
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Lachowicz et al. (2026) studied this question.
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