Appearance of Bordetella pertussis strains not expressing the vaccine antigen pertactin in Finland

Barkoff, A-MMertsola, JGuillot, SGuiso, NBerbers, GHe, Q2025-03-212025-03-2120122291436310.1128/CVI.00367-12https://rivm.openrepository.com/handle/10029/645898Appearance of Bordetella pertussis strains not expressing the vaccine antigen pertactin in FinlandArticleClin Vaccine Immunol 2012; 19(10):1703-42025-03-21