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Major pertussis vaccine types for primary immunization currently in use worldwide.
aP, acellular pertussis (the number before aP indicates the number of pertussis antigens included in the vaccine); D, diphtheria toxoid; HepB, hepatitis B; Hib, Haemophilus influenzae type b; HIC, high-income country; IPV, inactivated poliovirus; LMIC, low- and middle-income country; NA, not applicable; T, tetanus toxoid; wP, whole-cell pertussis
