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  1. Pertussis - World Health Organization (WHO)

  2. Understanding whooping cough with a Mayo Clinic expert

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

  4. Whooping cough (pertussis) is a highly contagious respiratory …

  5. Mayo Clinic Minute: What is whooping cough?

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

  7. Mayo Clinic Q and A: Pertussis most contagious during early …

  8. Signs and Symptoms of Pertussis - Mayo Clinic News Network

  9. Pertussis - World Health Organization (WHO)