1. Centers for Disease Control and Prevention. Quadrivalent human papillomavirus vaccine: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2007;56(RR-2):1–32
2. Centers for Disease Control and Prevention. Prevention and control of meningococcal disease recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2005;54(RR-7):1–28
3. Centers for Disease Control and Prevention. Prevention of rotavirus gastroenteritis among infants and children: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2006;55(RR-12):1–16
4. Centers for Disease Control and Prevention. CDC vaccine price list. Available at: www.cdc.gov/vaccines/programs/vfc/cdc-vac-price-list.htm. Accessed April 10, 2008
5. Pollack A. In need of a booster shot: rising costs make doctors balk at giving vaccines. New York Times. March 24, 2007