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Doctors' Answers to "Frequently Asked Questions" - Croup
Adult Croup [posted 8/14/98]
Answer: Most likely you had adult Pertussis (whooping cough). The immunizations given when you were young tend to wear off and adults will get the infection. This does not mean that their immune system has any problems, merely a lessening of the immunity with time - a normal function. I see several cases a year. Serologies can make the diagnosis if you are interested.