Article
Inter- and intraspecies spread of Escherichia coli in a farm environment in the absence of antibiotic usage.
Proceedings of the National Academy of Sciences of the United States of America - 1 Sept 1990
Marshall B, Petrowski D, Levy S B
Abstract excerpt
The spread of wild-type Escherichia coli bearing a transferable plasmid was studied in a farm environment. E. coli of bovine and porcine origin were marked by resistance to nalidixic acid (Nar) or rifampicin (Rfr), and a transferable, multiple resistance plasmid (pSL222-1 derivative of plasmid R222) was introduced by conjugation. In separate experiments, the two mutant derivatives were fed back to the respective...
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