All of 670 apparently unrelated chloramphenicol-resistant strains of of human and animal origin were multiply-resistant; over 66 per cent. of them were resistant to five or more antibiotics.

The resistance of 96 per cent, of 400 of the strains could be transmitted, often at a high rate, to strain K12F. A lower and variable proportion of the strains transmitted their resistance to nine other enterobacterial strains, principally pathogens; the rate of transmission was much lower than that which occurred to strain K12F.


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