By Holly Lebowitz Rossi
September 20, 2011

The vaccine against the bacterial illness pertussis, commonly known as "whooping cough," fades after just 3 years, a new, preliminary study has found.

The study was presented at the American Society for Microbiology conference, and, if the results are replicated in future research, could have consequences for how often pediatricians recommend vaccinating babies and children against pertussis.

The Associated Press reports:

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