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A member asked:
What causes pertussis infections if people are already vaccinated?
8 doctors weighed in across 2 answers
Waning immunity: Pertussis & most other bacterial vaccines (meningitis, diptheria, tetanus, etc.) give the body a time limited period of benefit. By 6-10 years after the last vaccine, the decrease allows people to develop symptomatic disease & or pass it to others. Since pertussis is more a chronic cough with teens & adults, some may never know they have it.
Answered 1/5/2019
5.9k views
And...: Dr ferguson is quite correct. Also, there are several species of bacteria & viruses that cause a "pertussis-like" syndrome, but are not pertussis. These conditions are not as serious as actual pertussis, and are not vaccinated against.
Answered 4/6/2012
5.9k views
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