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  1. Pertussis - World Health Organization (WHO)

  2. Pertussis - World Health Organization (WHO)

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

  4. Diphtheria - World Health Organization (WHO)

  5. Measles - World Health Organization (WHO)

  6. A Brief History of Vaccination - World Health Organization (WHO)

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

  8. Pertussis: Vaccine Preventable Diseases Surveillance Standards

  9. Pneumonia - World Health Organization (WHO)