Phillips A, Hahn D W, McGuire J, Wang M W, Heap R B, Rider V, Taussig M J
Ortho Research Laboratories, Ortho Pharmaceutical Corporation, Raritan, New Jersey 08869.
Contraception. 1988 Jul;38(1):109-16. doi: 10.1016/0010-7824(88)90100-x.
A monoclonal antibody against progesterone completely blocked pregnancy when rats were injected intraperitoneally at 0.53 mumol/kg/day on days 1 and 2, or on day 11 of a first pregnancy. The antibody was equally effective when injected again during a second pregnancy. There was no evidence for anti-idiotypic antibody production even when the injection of a heterologous (mouse) antibody was repeated in a second pregnancy.