1. Centres for Disease Control and Prevention (2014) Primary and secondary syphilis—United States, 2005–2013. Morb Mortal Wkly Rep 63(18):402–406
2. Aadland D, Finnoff D, Huang K (2013) Syphilis cycles. J Econ Financ 13(1):297–348
3. Bartlett JG, Auwaerter PG, Pham PA (2010) John Hopkins POC-IT Center ABX guide: diagnosis and treatment of infectious diseases. Jones and Bartlett Publishers, Burlington
4. Baughn R, Musher D (2005) Secondary syphilitic lesions. Clin Microbiol Rev 18(1):205–216
5. Berman SM (2004) Maternal syphilis: pathophysiology and treatment. Bull WHO 82(6):433–438