
January 2, 2013
The Centers for Disease Control and Prevention announced earlier this year that the number of pertussis, or whooping cough, cases in 2012 would surpass those seen every year since 1959.

January 2, 2013
The Centers for Disease Control and Prevention announced earlier this year that the number of pertussis, or whooping cough, cases in 2012 would surpass those seen every year since 1959.
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