用rDNA指纹图分析我国部分椰酵假单胞菌的分子流行病学特征

椰酵假单胞菌的染色体ＤＮＡ经ＢｇｌⅡ＋ＥｃｏＲＶ同时消化后分离，用生物素标记的１６Ｓ＋２３ＳｒＤＮＡ探针杂交，制备其ｒＤＮＡ指纹图。用ｒＤＮＡ指纹图分析方法将５１株椰酵假单胞菌分为２０个核糖型，其中ＲＴ６、９、２包含了一半以上菌株（占５２．９％）。一个省（市）常同时存在２个或２个以上的核糖型，其亲缘关系有近有远；尽管有的核糖型在不同省（市）交叉分布，但各核糖型都分别局限于部分区域。在贵州、江苏、河北３个省的４起食物中毒样品中分离到同一核糖型（ＲＴ６）的菌株，说明这４起食物中毒事件的发生有密切的联系，它们可能由同一克隆的菌株所引起。借助于核糖型分类和聚类分析结果，推断不同菌株间的亲缘关系，为追踪椰酵假单胞菌的传播途径、探讨其进化关系和流行规律提供了一种有效的手段。

Study on the Molecular Epidemiology Characteristics of Pseudomonas Cocovenenans Subsp. Farinofermentans Isolated from China with rDNA Fingerprinting

After the chromosomal DNA digestion by Bgl II and EcoRV, rDNA fingerprinting for Pseudomonas cocovenenans subsp. farinofermentans was made using biotin-labeled 16S + 23S rDNA as a probe. Fifty one strains of P. cocovenenans subsp. farinofermentans isolated from some areas of China were divided into 20 ribotyes, 52.9 percent of which were RT6, 9 and 2. In most cases, there were 2 or more ribotypes in each province or city. Though same ribotypes were isolated from different provinces, each ribotype existed in part of an area. The ribotype of RT6 was detected in samples from 4 incidents of food poisoning in Guizhou, Jiangsu and Hebei provinces, which indicated that these incidents may be caused by the same clone. With discrimination and cluster analysis of ribotypes, the rDNA fingerprinting may effectively contribute to analyzing the homogeneity of different strains, tracing the transmission route, and exploring the evolution and epidemiological characteristics of P. cocovenenans subsp. farinofermentans.