According to studies in the U.S. 48,277 and 24,231 incident cases of pertussis were reported to the CDC for the years 2012 and 2013, the highest since 1955. Nine deaths occurred in infants younger than 3 months old. Over 40% of 5351 cases younger than 7 years old had received
According to studies in the U.S. 48,277 and 24,231 incident cases of pertussis were reported to the CDC for the years 2012 and 2013, the highest since 1955. Nine deaths occurred in infants younger than 3 months old. Over 40% of 5351 cases younger than 7 years old had received