In this May 10, 2012 photo, Claudia Solorio holds her daughter, Kimberly Magdeleno, 4, as nurses give her a whooping cough booster shot at a health clinic in Tacoma, Wash. State health officials declared an epidemic as the number of pertussis cases has soared this year. (Associated Press/ File)

In this May 10, 2012 photo, Claudia Solorio holds her daughter, Kimberly Magdeleno, 4, as nurses give her a whooping cough booster shot at a health clinic in Tacoma, Wash. State health officials declared an epidemic as the number of pertussis cases has soared this year. (Associated Press/ File)