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Although most children in the Western world have been immunized against whooping cough (also called "pertussis"), this protection wears off after about 15 years. Thus, any teen or adult with a persistent cough may actually have whooping cough. This is particularly dangerous for babies too young to be vaccinated, and any un-vaccinated children. Whooping cough can be fatal to an infant. The cough symptoms of whooping cough is usually productive initially, but then becomes a persistent dry cough, lasting up to 100 days. Elderly grandparents may also be a reservoir of undiagnosed whooping cough.
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