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2012 was worst year for whooping cough since 1955

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The nation just suffered its worst year for whooping cough in nearly six decades, according to preliminary government figures. Whooping cough ebbs and flows in multi-year cycles, and experts say 2012 appears to have reached a peak with 41,880 cases. Another factor: A vaccine used since the 90s doesn't last as long as the old one. The vaccine problem may continue to cause higher than normal case...

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