Eighty-two reproductive-aged patients who had early miscarriages of infectious genesis were examined. Group I comprised 56 women who had a history of one spontaneous miscarriage; Group 2 included 26 patients with a history of 2 spontaneous miscarriages or more. The examination used a set of diagnostic tools for the identification of genital infections and histological, histochemical, and statistical studies. Group 2 patients were ascertained to have more frequently infectious inflammatory genital diseases. In the women of both groups, chronic endometritis of mainly Ureaplasma, Mycoplasma, and viral etiologies was recorded in 100% of cases while that of mixed etiology was observed in 57%. Moreover, the signs of endometrial stromal fibrosis and atrophy, receptor apparatus lesion, and suppressed tissue protective immune reactions were significantly more evident in Group 2 patients.