河南省部分地区鸡源致病性大肠杆菌生物学特性的研究

从河南省不同发病鸡群中采取典型鸡大肠杆菌病痛料，分离鉴定出8株鸡大肠杆茵。8株分离茵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个茵株均对氟苯尼考、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；大多数茵株对氧氟沙星、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个茵株的血清型，大多数为O78，占75％，少数为O119占25％。

Biological characteristics of Chicken E.coli Isolated from Henan Province

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%).