Drug-resistance and conjugative R plasmids in Escherichia coli strains isolated from wild birds (Japanese tree sparrows,green pheasants and bamboo partridges).

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E. coli strains were isolated from wild birds (Japanese tree sparrows (J.S.), Green pheasants (G.P.) and Bamboo partriges (B.P.)) for examining their drug-resistance and detection of conjugative R plasmids. Total E. coli strains isolated (30 strains were colected from each one) were 1380, 810 and 1530 respectively. And the isolation frequency of resistant strains were 87.5% (J.S.), 12.5% (G.P.) and 15.8% (B.P.). Individuals that excreted resistant strains were 46 out of 63 J.S. (73.0%), 13 out of 41 G.P. (31.7%) and 51 out of 76 B.P. (67.1%). The frequency of R+ strains among representative resistant strains were 13.9%, 13.5% and 9.2%, respectively. These results indicate that wild birds may also become the carriers of resistant strains and may be responsible for the spread of R plasmids in a wide area.
日本家禽学会の論文