ABO and fetal erythroblastosis: In addition to the ABO blood group system, antibodies that recognized D, C, c, E, e, M, N, S, s, Fya, Fyb, Jka, Jkb, K, k, Lea, Leb, P1, Dia, and Mur, which are 20 antigens that belong to eight blood group systems (Rh, Kidd, MNS, Duffy, Kell, Lewis, P, and Diego), can cause severe HTRs and HDFN, which are clinically important [14, 15].