What is the etiology of Ureaplasma urealyticum infection? First of all, Ureaplasma urealyticum is one of the common pathogens of the genitourinary tract, which is usually a surface infection and most of them do not invade the blood. The main way it is transmitted is sexually, so it is mostly seen in the young sexually active period, especially after impure intercourse. When the genitourinary tract is inflamed and the mucosal surface is damaged, Mycoplasma solani is prone to invade through the breach and cause genitourinary tract infections. After genitourinary tract infections, most patients have no obvious symptoms, which is also prone to delayed treatment and the possibility of underdiagnosis.