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种痘预防天花的效果已被多年实践所肯定。解放后,在毛主席革命卫生路线指引下。有计划地开展全民种痘,在杜绝带入天花的发生和流行方面做出了显著成绩。牛痘苗生产在我国已有悠久历史,但长期以来改进甚少,生产仍需大批耕牛,制品中异性蛋白成分较多,一般带有杂菌。为了提高痘苗质量、节省耕牛、简化生产工艺,1962年研
The effect of vaccination against smallpox has been affirmed by many years of practice. After the liberation, under the guidance of Chairman Mao’s revolutionary health line. The plan to carry out universal vaccination has made remarkable achievements in preventing the occurrence and prevalence of imported smallpox. The production of vaccinia vaccine has a long history in our country, but it has not been improved for a long time. Therefore, the production of cattle vaccinia still needs a large number of cattle farming. The heterosexual protein content in the products is relatively high, usually with bacteria. In order to improve the quality of vaccinia, save cattle, simplify the production process, 1962 research