The effectiveness of the DTaP vaccine waned each year that passed since the last dose was given among children in California involved in the 2010 pertussis outbreak, according to a CDC study in the Journal of the American Medical Association. Researchers reported that children who had not been vaccinated were nine times as likely to get pertussis as those who had received all five shots in the DTaP series.
Protection offered by pertussis vaccine may fade over time
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