Comment on

• Reduced risk of pertussis among persons ever vaccinated with whole cell pertussis vaccine compared to recipients of acellular pertussis vaccines in a large US cohort.

  Witt MA, Arias L, Katz PH, Truong ET, Witt DJ. Witt MA, et al. Clin Infect Dis. 2013 May;56(9):1248-54. doi: 10.1093/cid/cit046. Epub 2013 Mar 13. Clin Infect Dis. 2013. PMID: 23487373
• Reduced risk of pertussis in whole-cell compared to acellular vaccine recipients is not supported when data are stratified by age.

  André P, Johnson DR, Greenberg DP, Decker MD. André P, et al. Clin Infect Dis. 2013 Dec;57(11):1658-60. doi: 10.1093/cid/cit552. Epub 2013 Aug 15. Clin Infect Dis. 2013. PMID: 23956165 No abstract available.