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Sexually transmitted infections (STIs), also referred to as sexually transmitted diseases (STDs), are infections that are commonly spread by sexual activity, especially vaginal intercourse, anal sex and oral sex. [1] [2] The most prevalent STIs may be carried by a significant fraction of the human population.
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.
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.
Syphilis is a bacterial infection transmitted by sexual contact [2] and is believed to have infected 12 million people in 1999 with greater than 90% of cases in the developing world. [3] It affects between 700,000 and 1.6 million pregnancies a year, resulting in spontaneous abortions , stillbirths , and congenital syphilis . [ 4 ]
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
The history of syphilis has been well studied, but the exact origin of the disease remains unknown. [3] It appears to have originated in both Africa and America. [4] [5] As such, there are two primary hypotheses: one proposes that syphilis was carried to Europe from the Americas by the crew(s) of Christopher Columbus as a byproduct of the Columbian exchange, while the other proposes that ...
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Studies have found co-infection with chlamydia ranging from 46 to 54% in young people with gonorrhea. [44] [45] Among persons in the United States between 14 and 39 years of age, 46% of people with gonorrheal infection also have chlamydial infection. [46] For this reason, gonorrhea and chlamydia testing are often combined.