-lymphocyte subsets of peripheral blood wereexamined by flow cytometry (FCM) in 20 cases ofunexplain habitual abortion(UHA) before and afteractive immunization treatment,with 10 normal preg-nant (NP) women and 20 normal nonpregnant(NNp)women as control.The results: there was no difference in the percen-tage of CD_3 cells between the UHA cases and NNP.Before immunization the percentage of CD_8 cells wassignificantly lower(P<0.001)and the ratio ofCD_4/CD_8 was increased(P<0.05)in UHA as com-pared with the NNP...