“…The presence of ABO haemagglutinating antibodies in the secretions of the lower female genital tract is now well established (Gershowitz et al, 1958;Solish et al, 1961 ;Tyler, Tyler & Denny, 1967;Schwimmer, Utsay & Behrman, 1967;Parish et al, 1967). However, the origin of these agglutinins, the mech¬ anism of their production, their properties other than erythrocyte agglutination, and, above all, their function are still unknown.…”