河南省部分地区鸡源致病性大肠杆菌生物学特性的研究

Biological characteristics of Chicken

从河南省不同发病鸡群中采取典型鸡大肠杆菌病病料,分离鉴定出8株鸡大肠杆菌。8株分离菌对雏鸡具有不同程度的致病作用,其中以兰考株和南阳株致病力最强,可使接种雏鸡100%发病死亡,其次是西华株和登封株,致死率均达75%。药敏试验结果表明:8个菌株均对氟苯尼考、头孢噻呋、头孢曲松、头孢唑啉、阿米卡星、卡那霉素、氯霉素高度敏感;大多数菌株对氧氟沙星、环丙沙星、氨苄西林、链霉素严重耐药。O因子血清凝集试验结果表明:8个菌株的血清型,大多数为O78,占75%,少数为O119,占25%。

strains of Escherichia coli were isolated from different chicken farms in Henan province.The charac-terstics of Gram-staining,culture,biochemistry et al had been detected.Lankao strain and Nanyang strain of E.coli had high pathogenicity to chicken with a100%mortality in artifical infection.Drug sensitivity test showed the isolated strains were sensitive to Florfenicol,Ceftiofur,Ceftriaxone,Cefazolin,Amikacin,Kanamycin and Chloramphenicol.There were2serotypes of O 78 (75%)and O 119 (25%).