对发生于同一鸡场不同日龄鸡群的大肠杆菌病和鸡霍乱病例,进行了发病情况及病理变化方面的检验。同时取新鲜病死鸡的脏器组织为材料进行细菌分离,经对36株分离菌的形态特征、理化特性等的鉴定,结果表明:分别为大肠杆菌(E.coli)和多杀巴斯德氏菌败血亚种(P.m u ltocid a subsp.sep tica),并通过人工感染试验证明分离菌为相应感染症的致病菌。
对一次养殖牙鲆(Paralichthys olivaceusL.Temminck et Schlegel)发生的病害进行了临床特征和病理变化等方面的检验。以5尾病(死)牙鲆做病变组织中的细菌检查及细菌分离,对分离做纯培养的10株菌(T030817-1至T030817-10)进行形态特征、理化特性等较系统的表观分类学指征鉴定;同时择代表菌株(T030817-1)进行16S rRNA基因分子鉴定,测定16S rRNA基因序列、分析相关细菌相应序列的同源性、构建了系统发生树。结果表明,10株分离菌均为乳球菌属(LactococcusSchleifer et al 1986)的格氏乳球菌(L.garvieae)。择代表菌株(T030817-1)做对健康牙鲆的人工感染试验,表明所分离鉴定的格氏乳球菌在被检牙鲆病例中具有相应原发病原学意义及较强的致病作用。药敏试验结果显示,在供试37种抗菌药物中,对青霉素G等14种药物高度敏感,对链霉素等5种药物敏感,对苯唑青霉素等18种药物耐药。
[Objective] This study aimed to explore the presence of three causative genes Colv,Stxs and HlyE of the pathogenic E.coli from chickens,pigs and food.[Method] By using 44 E.coli strains from chickens,24 from pigs and 26 from food as the experimental materials,virulence genes Colv,Stxs（stx2,stx2e） and HlyE were detected with polymerase chain reaction（PCR） method.[Result] Among all the E.coli strains,the detection rate of Colv was 25% from chickens,4.2% from pigs,and 0 from food;the detection rate of Stx2（Stx2e） from all E.coli strains was 0;the detection rate of HlyE was 2.27% from chickens,0 from pigs,and 11.5% from food.[Conclusion] Virulence gene Colv shows relatively high carrying rate in E.coli from chickens and pigs;HlyE also shows a certain degree of presence in E.coli from chickens and food.
