Before tetanus, diphtheria and pertussis vaccination was recommended for teens in 2006, the incidence of infant hospitalization for whooping cough increased each year from 2000 to 2005, according to a study in the journal Pediatrics. However, the rates of whooping cough-related hospitalizations among babies were significantly lower in 2008, 2009 and 2011, after the vaccine was recommended for teens. "Adolescent Tdap vaccination appears to be partially effective in preventing pertussis hospitalizations among infants," researchers said.

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