Analysis of biological properties of Escherichia coli from healthy chicken and infected chicken

strains of E.coli were isolated from health meat chickens and healthy egg chickens.O 1,O 2,O 7,O 8,O 36 ,O 78 and O 111 serogroups had been identicated in the strains and others could not be sertyped.O 2,O 78 were the pathogenicity serogroups.70 strains of E.coli were obtained from the infected chickens.O 2,O 78 ,O 36 serogroups had been identified in the strains and others could not be sertyped. Medicines susceptibility experiment of isolated germs strains was engaged with 9 antibiotics.Many strains have high susceptibility for gentamicin,furazolidone and kanamycin.Some strains have also higher susceptibility for chloromycetin,streptomycin and cinrofloxacin.Many strains have resistance to the action of tetracycline and sinomin.