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Posted by / 01-Nov-2017 09:18

There are many species of bacteria, protozoa, fungi, and viruses, many which remain undocumented or poorly studied with regards to sexual transmission.

A research letter posted in the journal Emerging Infectious Diseases in September 2017 listed 27 viruses found in semen, for the vast majority of the viruses, information on genital fluid transmission rates and routes was lacking.

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The amount of contact with infective sources which causes infection varies with each pathogen but in all cases a disease may result from even light contact from fluid carriers like venereal fluids onto a mucous membrane.

This is one reason that the probability of transmitting many infections is far higher from sex than by more casual means of transmission, such as non-sexual contact—touching, hugging, shaking hands—but it is not the only reason.

Sexually transmitted infections (STI), also referred to as sexually transmitted diseases (STD) and venereal diseases (VD), are infections that are commonly spread by sex, especially vaginal intercourse, anal sex or oral sex.Increased understanding of infections like HPV, which infects a significant portion of sexually active individuals but cause disease in only a few, has led to increased use of the term STI.Public health officials originally introduced the term sexually transmitted infection, which clinicians are increasingly using alongside the term sexually transmitted disease in order to distinguish it from the former.The visible membrane covering the head of the penis is a mucous membrane, though it produces no mucus (similar to the lips of the mouth).Mucous membranes differ from skin in that they allow certain pathogens into the body.

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In a disease, the infection leads to impaired or abnormal function.