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  1. Pertussis - World Health Organization (WHO)

  2. Pertussis (whooping cough) - World Health Organization (WHO)

  3. Pertussis: What you need to know - World Health Organization …

  4. Pertussis - World Health Organization (WHO)

  5. Pertussis - number of reported cases - World Health Organization …

  6. Pertussis: Vaccine Preventable Diseases Surveillance Standards

  7. Immunization, Vaccines and Biologicals - World Health …

  8. Recommendations to assure the quality, safety and efficacy of …

  9. Laboratory manual for the diagnosis of whooping cough caused …