1. (2004) Centers for Disease Control and Prevention. Transmission of primary and secondary syphilis by oral sex-Chicago, Illinois, 1998-2002. MMWR Morb Mortal Wkly Rep 53(41): 966-968.
2. (2005) Department of Health and Human Services CfDCaP, National Center for HIV, STD and TB Prevention, Division of STD Prevention. Sexually transmitted diseases surveillance 2004 supplement: syphilis surveillance report. Atlanta: Department of Health and Human Services CfDCaP, National Center for HIV, STD and TB Prevention, Division of STD Prevention.
3. World Health Organization (2012) Global incidence and prevalence of selected curable sexually transmitted infections - 2008 (Geneva: WHO). 1-20.
4. CDC (2014) Improving sexually transmitted disease programs through assessment, assurance, policy development, and prevention strategies (STD AAPPS). Atlanta, GA: U.S. Department of Health and Human Services, CDC.
5. (2006) Primary and secondary syphilis among men who have sex with men- New York City, 2001. United States, 2003-2004. Centers for Disease Control and Prevention, MMWR Morb Mortal Wkly Rep 51(38): 853-856.