Abstract
Despite widespread vaccination, pertussis remains endemic in the United States. Unimmunized infants, typically those under 2 months of age, are at greatest risk for severe disease and death. Previous studies have shown that household contacts, usually mothers, are the most common source of infant infection. In 2005, the CDC recommended a Tdap (tetanus, diphtheria, and acellular pertussis) vaccine booster for …
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