R FACTOR TYPES FOUND IN SALMONELLA-TYPHIMURIUM AND ESCHERICHIA-COLI ISOLATED FROM CALVES IN A CONFINED ENVIRONMENT

  • 1 January 1977
    • journal article
    • research article
    • Vol. 38  (6) , 743-747
Abstract
Typing of R factors by genetic properties was done with S. typhimurium and E. coli isolated from calves on a feedlot where epizootics of clinical or subclinical calf salmonellosis had repeatedly occurred during 5 yr. Forty-nine R factors from S. typhimurium were fi- (no fertility inhibition) and spp- (no restriction against phage .lambda. vir). Twenty-three (46.9%) of them belonged to compatibility group I.alpha. and the remainder were nontypable. Fourteen R factors from E. coli belonged to different genetic types: fi+ (11 = 78.6%) and fi- (3 = 21.4%); spp+ (1 = 7.1%) and spp- (13 = 92.9%); compatibility groups FII (5 = 35.7%), N (1 = 7.1%), and nontypable (8 = 57.2%). In contrast to the R factors of S. typhimurium, 9 (64.3%) of the 14 R factors of E. coli carried resistance against aminobenzyl penicillin with or without kanamycin resistance. The compatibility groups of R factors of S. typhimurium seemed to be useful as a subsidiary epizootiologic marker in this feedlot.

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