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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.
Most infected men with symptoms have inflammation of the penile urethra associated with a burning sensation during urination and discharge from the penis. [19] In men, discharge with or without burning occurs in half of all cases and is the most common symptom of the infection. [ 22 ]
STI Number of people with disease Notes Herpes: 4,000,000,000 [3] It is estimated that more than two-thirds of the global population has herpes, though it mostly lies dormant. Human papillomavirus infection: 800,000,000 [4] Chlamydia: 450,000,000 [5] Hepatitis B: 356,000,000 [6] Preventable with the Hepatitis B vaccine: Gonorrhea: 50,000,000 [5]
Trichomoniasis is a sexually transmitted infection (STI) most often spread by vaginal, oral, or anal sex. [1] It can also spread through genital touching (manual sex). [1] Infected people may spread the disease even when symptoms are absent. [2]
Symptoms that may occur include: a painful or burning sensation when urinating, an unusual discharge from the penis, testicular pain or swelling, or fever. If left untreated, chlamydia in men can spread to the testicles causing epididymitis , which in rare cases can lead to sterility if not treated. [ 15 ]
Syphilis (/ ˈ s ɪ f ə l ɪ s /) is a sexually transmitted infection caused by the bacterium Treponema pallidum subspecies pallidum. [1] The signs and symptoms depend on the stage it presents: primary, secondary, latent or tertiary.