Sá Lopes, Ramiro, Ana Sara Monteiro, Rosário Saez, Carlos Candeias, and Catarina Mendonça. “Malignant Syphilis: A Rare Case of Early Secondary Syphilis in an Immunocompetent Patient”. European Journal of Case Reports in Internal Medicine 10, no. 1 (February 3, 2023). Accessed November 3, 2026. https://ejcrim.com/index.php/ejcrim/article/view/3712.