摘要
目的 对江苏省徐州地区O157∶H7的病原学进行分析。方法 采用聚合酶链反应对O157∶H7菌株毒力基因谱进行检测 ,同时用脉冲凝胶电泳 (PFGE)和随机扩增多态性DNA(RAPD)方法对O157∶H7菌株的同源性分析比较。结果 流行地区分离的O157∶H7菌株 ,10 0 %携带Hly、eaeA基因 ,95 .35 %携带SLT2 基因 ,11.6 3%携带SLT1基因。脉冲凝胶电泳图谱表明流行地区分离的O157∶H7菌株与日本分离的O157∶H7菌株有明显差异 ,为不相关菌株 ;与国内标准菌株 882 36 4为近似型(相似 ,但不相同 )。流行地区患者分离菌株与外环境家畜家禽粪便及昆虫肠道分离菌株的脉冲凝胶电泳图谱完全相同。结论 携带O157∶H7菌株的家畜家禽可能是导致疫情发生的传染源。脉冲凝胶电泳方法用于O157∶H7病原学分析 ,对流行病学研究有重要意义。随机扩增多态性DNA方法用于O157∶H7病原学分析 ,技术简便、省时。
Objective To analyze the molecular epidemiological characteristics of E. coli O 157∶H 7 of Xuzhou, Jiangsu. Methods The virulence gene spectrum of E. coli O 157∶H 7 strains were analyzed by PCR and the homology of E. coli O 157∶H 7 strains were detected by PFGE and RAPD. Results In all E. coli O 157∶H 7 strains isolated from epidemic area, 100% possess Hly and eaeA gene, 95.35% possess SLT 2 gene, and 11.63% possess SLT 1 gene. The PFGE spectrum showed that the strains isolated from epidemic area were distinctively different from the strains isolated from Japan, and similar to but not identical with the standard strain 882364. The PFGE spectrum of strains isolated from epidemic area patients were identical with those of strains isolated from excrements of poultries, domestic animals and insect intestine.Conclusions Poultries and domestic animals which carry E.coli O 157∶H 7 could be the source of infection. PFGE could be used to analyze E.coli O 157∶H 7 and played an important role in epidemiology study. The results showed that the method of analysis of E. coli O 157∶H 7 by RAPD was convenient and time saving.
出处
《中华传染病杂志》
CAS
CSCD
北大核心
2003年第6期410-412,共3页
Chinese Journal of Infectious Diseases
关键词
肠出血性大肠埃希菌
O157:H7
基因同源性
聚合酶链反应
检测
流行病学
Electrophoresis, gel, pulsed field
Random amplified polymorphic DNA technique
Polymerase chain reaction
Bacterial toxins
Escherichia E. coli O 157∶H 7
Gastrointestinal hemorrhage
