Objective To study the influence of Ureaplasma urealyticum (UU) infection on semen quality of men. Methods 113 cases in the primary infertile group, 65 cases in the secondary infertile group, 41 cases in the habitual abortion group and 45 cases normal control group. The semen specimens were examined in UU infection by the culture method, the semen parameters of 81 cases with UU infection and 63 cases no UU infection were examined (semen volume, PH, sperm density, viability, forward progression and the percentages of malformed sperm) by conventional method. Result The positive rates of UU were ...