Depends: In infancy it can lead to a progressive cough that is so bad the infant strokes out and can die. It is most dangerous to infants in the first 6 months. In adults, it just produces a chronic "100 days "cough. Kids Kids in the middle have variable effect.Untreated disease also leads to significant transfer to those within the persons contacts.Susceptable persons will get and pass disease.
Answered 7/24/2018
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