Micoplasma hominis infection is caused by the bacteria Mycoplasma hominis.Micoplasma hominis infection is spread through vaginal intercourse, oral-to-genital contact, and vertically from mother to her infant in utero or by the colonization by the bacteria as the baby descends through the birth canal or by nosocomial acquisition through transplanted tissues. It is not present in the normal vaginal microbiota. It can also be present in bacterial vaginosis.