近几年来,通过基因工程技术对改造病毒变害为益,或通过它创建某些新的有用产品和新的生命类型以更有效地服务于人类的需要,并进一步探索由病毒或其他致病因子所引起的各种病害的病因及其防治已愈来愈引起人们的高度重视。本文着重从以下五个方面作些的介绍。一、发现有病毒质粒的存在所谓质粒就是指染色体外的遗传因子, In recent years, genetic engineering has benefited the virus modification, or created some new useful products and new life types through it to serve human needs more effectively, and further explore the possibility of virus or other pathogenic diseases The causes of various diseases caused by factors and their prevention and control have drawn more and more people’s attention. This article focuses on the introduction of the following five aspects. First, the existence of a virus plasmid found The so-called plasmid refers to extra-chromosomal genetic factors,