The CDC reported that less than 6% of U.S. adults received immunization against whooping cough in 2008 amid more than 13,000 reported cases of the infection. "A pertussis booster shot is essential to prevent the spread of pertussis to infants. This vaccine wears off, and if you don't get a booster you are putting babies at risk because the spread of pertussis is on the increase," an infectious disease expert said.

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