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Pertussis Outbreak Trends

Español: Tendencias de los brotes de tosferina

California Whooping Cough Epidemic, 2014

As of December 31, 28,660 cases of pertussis were reported to CDC during 2014, and this number is expected to increase as case counts are reconciled. This represents an 18% increase compared to the provisional numbers that were reported at the same time in 2013. The final case count in 2013 was 28,639.

Age-incidence trends observed during 2014 were similar to those in 2013 and 2012. Increased rates were again observed in adolescents 13 through 15 years of age, as well as in 16 year olds.

Overall reporting of pertussis declined during 2013 after a peak year in 2012. During 2012, 48,277 cases of pertussis were reported to CDC, including 20 pertussis-related deaths. This was the most reported cases since 1955. The majority of deaths occurred among infants younger than 3 months of age. The incidence rate of pertussis among infants exceeded that of all other age groups. The second highest rates of disease were observed in children 7 through 10 years old. Rates increased in adolescents 13 and 14 years of age.

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.

Reporting Changes in Pertussis


(updated March 11, 2015)
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changes in pertussis reporting by state from 2013-2014. Decreased: Alabama, Alaska, Arizona, Connecticut, Georgia, Idaho, Iowa, Maine, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Montana, New Hampshire, New Mexico, New York, North Dakota, Oklahoma, South Carolina, Vermont, Virginia, Washington, Wisconsin, Wyoming. No change: Pennsylvania. Increased: Arkansas, California, Colorado, Delaware, Florida, Hawaii, Illinois, Indiana, Kansas, Kentucky, Louisiana, Michigan, Nebraska, Nevada, New Jersey, North Carolina, Ohio, Oregon, Rhode Island, South Dakota, Tennessee, Texas, Utah, West Virginia.
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