《美国医学会杂志》第244卷第13期(1980年)报道:公共卫生官员今天发布了一项城市避孕免疫的新计划。从下月开始,可以给愿注射的人注射抗破伤风及抗妊娠疫苗;(1981年)春天可给予加倍量的加强注射剂。这样的通知可能是十年或十年以后的事,但是全世界的研究者们继续朝着实现此目的而努力研究。现有的理论可追溯到本世纪初1903年,M S Dobrowolski首先用特异的抗胎盘血清阻断动物妊娠。从1899年以来,许多科学 Journal of the American Medical Association, Vol. 244, No. 13 (1980): Public health officials today announced a new plan for urban immunization. From next month onwards, injectable anti-tetanus and anti-pregnancy vaccines may be given to those who are willing to inject; (1981) double doses of booster injections may be given. Such notifications may be 10 or 10 years from now, but researchers around the world continue to work toward this end. The current theory dates back to the beginning of this century in 1903 when M s Dobrowolski first blocked animal pregnancy with specific anti-placental serum. Since 1899, many sciences