title: Characteristics of conjugative R-plasmids from pathogenic avian Escherichia coli.
abstract: Three of four virulent avian Escherichia coli isolates transferred a single large molecular-weight R-plasmid to two recipient E. coli strains. Antibiotic resistances transferred included streptomycin (two isolates) and streptomycin-tetracycline-sulfa (one isolate). Production of colicin and siderophores, complement resistance, and embryo lethality present in the virulent isolates were not transferred to recipient organisms. From the results, it appears that the R-plasmids of these virulent avian E. coli are not associated with virulence.
authors.affiliation: Department of Medical Microbiology, College of Veterinary Medicine, University of Georgia, Athens 30602.
authors.forename: R E
authors.initials: RE
authors.lastname: Wooley
authors.forename: K R
authors.initials: KR
authors.lastname: Spears
authors.forename: J
authors.initials: J
authors.lastname: Brown
authors.forename: L K
authors.initials: LK
authors.lastname: Nolan
authors.forename: M A
authors.initials: MA
authors.lastname: Dekich
mesh_terms: D000818:Animals; D002645:Chickens; D003165:Complement System Proteins / Q000276:immunology; D003227:Conjugation, Genetic; D004352:Drug Resistance, Microbial / Q000235:genetics; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000276:immunology; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary*; D010641:Phenotype; D011201:Poultry Diseases / Q000382:microbiology*; D011815:R Factors; D014774:Virulence / Q000235:genetics
chemical_list: D003165:Complement System Proteins