1. Tetanus surveillance - United States, 2001–2008;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report (MMWR),2011
2. Annual tables of infectious disease data;Centers for Disease Control and Prevention. National Notifiable Diseases Surveillance System,2018
3. Vaccination coverage for selected diseases among children aged 19–35 months, by race, Hispanic origin, poverty level, and location of residence in metropolitan statistical area: United States, selected years 1998–2017;Centers for Disease Control and Prevention
4. Vaccination coverage among adults in the United States, National Health Interview Survey, 2016;Centers for Disease Control and Prevention
5. Weekly Epidemiological Record;World Health Organization,2017