National immunization survey-Teen, United States, 2006–2011. Estimated vaccination coverage with selected vaccines and doses among adolescents aged 13 to 17 years, by survey year. a On or after age 10 years. b Among females. c Among males. Adolescent vaccination coverage increased from 2006 to 2011, although the rate of increase differed by vaccine. MenACWY, meningococcal conjugate vaccine; Tdap, tetanus toxoid, diphtheria toxoid, acellular pertussis vaccine. (Data from Morbidity and Mortality Weekly Report (MMWR). National and state vaccination coverage among adolescents aged 13–17 years — United States, 2011. Available at: http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6134a3.htm?s_cid5mm6134a3_e%0d%0a#fig. Accessed February 28, 2013.)