Antibodies produced by the vaccine Pr-beta-hCG-TT in monkeys were effective in terminating pregnancy in baboons on passive administration. The animals returned to cyclicity soon after the onset of vaginal bleeding. Fertility was regained. Globulins from non-immunized control monkeys in amounts, volume and injection schedule similar to those employed for passive termination did not intercept pregnancy. The abortifacient action of anti-CG antibodies could be counteracted by administration of medroxyprogesterone acetate.
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