ABSTRACT
In order to detect phenotypic characteristics associated with pathogenicity, 25 strains of Escherichia coli, isolated from clinical cases of colisepticemia in broiler chickens, were examined to determine the following properties: colicinogenicity, colicin V production, type 1 fimbriae, hemolysin expression and motility. Colicinogenicity occurred in 72% of the strains, 56% of all strains produced colicin V, 84% were positive for type 1 fimbriae and 80% were positive for motility. None of the strains had hemolytic activity; however, all of them, expressed at least one of the other characteristics studied. These results suggest that the diversity of phenotypes detected partially explain the multifactorial nature of avian colisepticemia.
Subject(s)
Escherichia coli Infections/veterinary , Escherichia coli/pathogenicity , Poultry Diseases/microbiology , Sepsis/veterinary , Bacterial Typing Techniques , Bacteriocin Plasmids , Bacteriological Techniques , Colicins/analysis , Escherichia coli/isolation & purification , Escherichia coli Infections/microbiology , Fimbriae, Bacterial/ultrastructure , Hemolytic Plaque Technique , Mexico , Phenotype , Sepsis/microbiology , VirulenceABSTRACT
In order to detect phenotypic characteristics associated with pathogenicity, 25 strains of Escherichia coli, isolated from clinical cases of colisepticemia in broiler chickens, were examined to determine the following properties: colicinogenicity, colicin V production, type 1 fimbriae, hemolysin expression and motility. Colicinogenicity occurred in 72
of the strains, 56
of all strains produced colicin V, 84
were positive for type 1 fimbriae and 80
were positive for motility. None of the strains had hemolytic activity; however, all of them, expressed at least one of the other characteristics studied. These results suggest that the diversity of phenotypes detected partially explain the multifactorial nature of avian colisepticemia.