Minnesota's record year for whooping cough

Whooping cough
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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