SEXUALLY TRANSMITTED INFECTIONS: MODES OF TRANSMISSION
Sexually transmitted infections are generally spread through some form of intimate sexual contact. Sexual intercourse, oral-genital contact, hand-genital contact, and anal intercourse are the most common modes of transmission. More rarely, pathogens for STIs are transmitted mouth to mouth or, even more infrequently, through contact with fluids from body sores. While each STI is a different infection caused by a different pathogen, all STI pathogens prefer dark, moist places, especially the mucous membranes lining the reproductive organs. Most of these organisms are susceptible to light, excess heat, cold, and dryness, and many die quickly on exposure to air. (The toilet seat is not a likely breeding ground for most bacterial or viral STIs!) Although most STIs are passed on by sexual contact, other kinds of close contact, such as sleeping on the sheets used by someone who has pubic lice, may also cause you to get an STI.
Like other communicable infections, STIs have both pathogen-specific incubation periods and periods of time during which transmission is most likely, called periods of communicability.
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