U.S.

Associated Press
FILE - This Monday, Sept. 19, 2011 file photo shows an empty bottle of Tetanus, Diphthera and Pertussis, (whooping cough) vaccine at Inderkum High School in Sacramento, Calif. Health officials say the U.S. is on track to have the worst year for whooping cough in more than five decades. Nearly 18,000 cases have been reported so far - more than twice the number seen at this point last year, the Centers for Disease Control and Prevention said Thursday, July 19, 2012. At this pace, the number of whooping cough cases will surpass every year since 1959. (AP Photo/Rich Pedroncelli)

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