For example: someone putting their fingers inside of your vagina and then later on (mind u, without them washing their hand) using that same hand/fingers later to touch their penis. Can trich be spread from person to person, in this way?
It is theoretically possible, although unlikely. If the organism (protozoa) can live exposed to the air for very long it is possible. It would most likely have to be immediate transfer; within a few seconds.Trichomoniasis is caused by the single-celled protozoan parasite, Trichomonas vaginalis. The vagina is the most common site of infection in women, and the urethra (urine canal) is the most common site of infection in men. The parasite is sexually transmitted through penis-to-vagina intercourse or vulva-to-vulva (the genital area outside the vagina) contact with an infected partner. Women can acquire the disease from infected men or women, but men usually contract it only from infected women.
CDC
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