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A sexually transmitted infection (STI), also referred to as a sexually transmitted disease (STD) and the older term venereal disease (VD), is an infection that is spread by sexual activity, especially vaginal intercourse, anal sex, oral sex, or sometimes manual sex.
The disease is typically spread by direct genital contact with the skin surface or secretions of someone who is infected. [1] This may occur during sex, including anal, oral, and manual sex. [1] [5] Sores are not required for transmission to occur. [1] The risk of spread between a couple is about 7.5% over a year. [6]
Herpes gladiatorum is one of the most infectious of herpes-caused diseases, and is transmissible by skin-to-skin contact. The disease was first described in the 1960s in the New England Journal of Medicine. It is caused by contagious infection with human herpes simplex virus type 1 (HSV-1), [1] which more commonly causes oral herpes (cold sores).
During immunodeficiency, herpes simplex can cause unusual lesions in the skin. One of the most striking is the appearance of clean linear erosions in skin creases, with the appearance of a knife cut. [23] Herpetic sycosis is a recurrent or initial herpes simplex infection affecting primarily the hair follicles.
Lymphogranuloma venereum (LGV; also known as climatic bubo, [1] Durand–Nicolas–Favre disease, [1] poradenitis inguinale, [1] lymphogranuloma inguinale, and strumous bubo) [1] is a sexually transmitted infection caused by the invasive serovars L1, L2, L2a, L2b, or L3 of Chlamydia trachomatis.
Approximately 2–6 weeks after contact (with a range of 10–90 days) a skin lesion, called a chancre, appears at the site and this contains infectious bacteria. [ 20 ] [ 21 ] This is classically (40% of the time) a single, firm, painless, non-itchy skin ulceration with a clean base and sharp borders approximately 0.3–3.0 cm in size. [ 3 ]
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(Pinta is a skin disease and therefore unrecoverable through paleopathology.) Ancient DNA (aDNA) holds the answer, because just as only aDNA suffices to distinguish between syphilis and other diseases that produce similar symptoms in the body, it alone can differentiate spirochetes that are 99.8 percent identical with absolute accuracy.