Reported pertussis cases, United States, 1922 to 2016

Reproduced from: Centers for Disease Control and Prevention. Pertussis (Whooping Cough): Surveillance & Reporting. National Notifiable Diseases Surveillance System and Supplemental Pertussis Surveillance System and 1922-1949, passive reports to the Public Health Service. Available at: http://www.cdc.gov/pertussis/surv-reporting.html (Accessed on November 27, 2018).