Summary
Plasmids were recovered and are described from three ruminal Bacteroides strains — 23, 223/M2/7 and 46/5(2). Although all three were originally isolated as Bacteroides ruminicola, 46/5(2) is shown here to be a strain of Bacteroides multiacidus, a species not previously described from the rumen. An 11.7 kbp plasmid present in strain 46/5(2) gave the same digestion pattern with Sal I and Sma I as a plasmid in B. multiacidus subgroup b type strain P208-58. Strains 46/5(2) and P208-58 both showed resistance to tetracycline, as did B. ruminicola strain 223/M2/7. B. multiacidus P208-58, and, to a lesser degree, B. ruminicola 23, showed resistance to ampicillin. Four other strains of B. ruminicola and one of B. multiacidus in which plasmids were not detected were sensitive to both antibiotics. It has still to be established whether these resistance traits are plasmid or chromosomally coded.
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Flint, H.J., Stewart, C.S. Antibiotic resistance patterns and plasmids of ruminal strains of Bacteroides ruminicola and Bacteroides multiacidus . Appl Microbiol Biotechnol 26, 450–455 (1987). https://doi.org/10.1007/BF00253531
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DOI: https://doi.org/10.1007/BF00253531