目前,关于变形链球菌(简称变链菌)质粒DNA的理论及实验手段的研究不断取得进展,在龋病研究领域中已提出一些质粒与细菌遗传变异有关的理论。然而,有关变链菌质粒的检测方法,质粒在变链菌中的检出率以及所起的作用仍在探索之中。本研究目的是在建立细菌遗传学试验手段的基础上,运用分子 At present, the research on the theory and experimental means of plasmid DNA of Streptococcus mutans (Streptococcus mutans) has made continuous progress. In the field of dental caries research, some theories about the relationship between plasmid and bacterial genetic variation have been proposed. However, the detection of Streptomyces plasmid, the detection rate of Streptococcus mutans plasmid and its role is still under investigation. The purpose of this study was to use molecules based on the establishment of bacterial genetic testing tools