Minnesota's record year for whooping cough
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![Whooping cough](https://img.apmcdn.org/7d9df5b88e2f1e2aae680d4d58629c29f7b06d62/uncropped/e82749-20121004-whooping-cough.jpg)
Pharmacist Kristy Hennessee administers a vaccination against whooping cough, in Pasadena, California on September 17, 2010.
ROBYN BECK/AFP/Getty Images
Minnesota had a record year for whooping cough cases in 2012, with more than 4,300 cases reported. That's more than any year since World War 2.
The sharp increase is being blamed on a pertussis vaccine that doctors started to administer in the 1990s.
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