The diphtheria, tetanus and pertussis vaccine is effective only 24% of the time among children ages 8 to 12, according to a study in the journal Clinical Infectious Diseases. For every 10,000 children, researchers found 245 whooping cough cases for the 8- to 12-year-old age group compared with about 36 cases for the 2- to 7-year-old group.

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