1. Centers for Disease Control and Prevention Pertussis (whooping cough): Outbreak www.cdc.gov/pertussis/outbreaks.html
2. Centers for Disease Control and Prevention Pertussis (whooping cough): Surveillance & reporting http://www.cdc.gov/pertussis/surv-reporting.html
3. Centers for Disease Control and Prevention Pertussis (whooping cough): Pertussis outbreak trends www.cdc.gov/pertussis/outbreaks/trends.html
4. Measles-United States, 2011;Centers for Disease Control and Prevention;Morbidity and Mortality Weekly Report (MMWR),2012
5. Centers for Disease Control and Prevention Figure depicting coverage with individual vaccines from the inception of NIS, 1994 through 2011 www.cdc.gov/vaccines/stats-surv/nis/figures/2011_map.htm