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Between 1988 and 1996, the number of cases of pertussis reported in the United States has ranged between 2,719 and 7,796, considerably higher than levels reported between 1976 and 1980.1 The highest attack rate of pertussis occurs in children 15 years of age. Pertussis is highly contagious; secondary attack rates exceed 80% among highly susceptible household contacts.2 Pertussis is a worldwide problem; the World Health Organization estimated that in 1994 approximately 40 million cases occurred worldwide, with 360,000 children dying.3
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Weber et al. (1998) studied this question.
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