Summary: A total of 1461 bacterial isolates, representing 24 different species of the genus , were examined for the presence of plasmid DNA. Approximately 20% of the isolates contained detectable plasmids, but only four species were represented: , the predominant bifid species in the human intestine; , the most common in animals; and and , species found exclusively in the intestines of western and asiatic honey bees, respectively. Multiple plasmids were common among isolates of and , while all plasmid-bearing isolates of and 60% of isolates contained only one plasmid each. Certain multiple plasmid profiles were predominant among the and isolates.


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