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Pertussis Outbreak Trends

During 2015, state health departments reported 20,762 cases of pertussis to CDC. This represents a 37% decrease compared to 32,971 cases reported during 2014.

Age-incidence trends observed during 2015 were similar to those in 2014 and 2013. CDC again observed increased rates in adolescents 13 through 15 years of age, as well as in 16 year olds. The majority of deaths occurred among babies younger than 3 months old. The incidence rate of pertussis among babies exceeded that of all other age groups.

See the annual number of reported pertussis cases going back to 1922 or view the latest number of cases reported by states and territories. Since there is a lag in reporting to CDC, the most up-to-date information for states and territories is available from local health departments.

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