Ureaplasma urealyticum reduces motility and induces membrane alterations in human spermatozoa

The in-vitro effects of several concentrations of Ureaplasma urealyticum on the motility, membrane integrity and morphology of washed spermatozoa from healthy donors were studied. A significant reduction in sperm motility and signs of membrane alteration, directly related to U.urealyticum concentrat ion and contact time were observed. Scanning electron microscopy examinatio n showed masses of U.urealyticum attached to the head and middle piece of s ome of deformed spermatozoa. It is suggested that U.urealyticum is involved in sperm. changes leading to male infertility, particularly when there is heavy U.urealyticum colonization or specific infections with this microorga nism.