How many cases of pertussis are reported in the United States?
An average of more than 160,000 cases and more than 5,000 deaths were reported every year in the 1920s-30s. At its peak during this period, the annual number of case-reports was more than 250,000 with up to 9,000 deaths. In the 1940s, whole-cell pertussis vaccine combined with diphtheria and tetanus toxoids (DTP) was introduced, and case-reports of pertussis decreased more than 99% by 1976, when the number of reported cases reached a record-low of 1,010 cases.
