US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Syphilis. Historical medical illustrations showing syphilis chancres on the female nipple and on the forefinger. Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum. The disease has three stages, first an ulcer (known as a chancre) at the site of infection, followed several weeks later by a systemic skin rash. The third stage, which follows a latency period that can last for years, involves spread to the organs and nervous system and can cause mental illness and death. From Atlas of Venereal and Skin Diseases by Prince Albert Morrow, published in 1889.
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