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Trichomoniasis, commonly referred to as “Trich,” is a highly contagious sexually transmitted disease in cattle, resulting in abortions and infertility. It is caused by a microscopic protozoan parasite Tritrichomonas foetus. In the cow, the organism colonizes the vagina and uterus. In bulls, the organism colonizes or lives in microscopic folds, or crypts, on the skin of the penis and prepuce. As a bull ages, conditions on the surface of the sex organs are more conducive for this protozoa to survive and multiply.