Viruses are present as contaminants of semen and act as a source of spread of viral disease not necessarily genital affections, they cause specific reproductive diseases through coitus (coital viral diseases), and invade reproductive tract through means other than via vagina and the main pathogenic effect of which on the uterus is the production of abortion The diseases namely coital exanthema, epizootic infertility. Catarrhal Viruses are present as contaminants of semen and act as a source of spread of viral diseases not necessarily genital affections; they cause specific reproductive diseases through coitus (coital viral diseases), and invade reproductive tract through means other than via vagina and the main pathogenic effect of which on the uterus is the production of abortion Tae diseases namely coital exanthema, epizootic infertility, catarrhal vaginitis, viral infertility, epizootic bovine abortion, infectious bovine rhinotracheatis, virus diarrhoea and rift valley fever, have also been discussed.