熟齢動物(種鶏, 種豚, 乳牛)および成人から分離された大腸菌の薬剤耐性と接合性Rプラスミドの分布

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  • Drug-resistance and distribution of conjugative R plasmids in Escherichia coli strains isolated from healthy adult animals and humans.
  • 熟齢動物(種鶏,種豚,乳牛)および成人から分離された大腸菌の薬剤耐性と接合性Rプラスミドの分布〔英文〕
  • ジュクレイ ドウブツ シュケイ タネブタ ニュウギュウ オヨビ セイジン カラ

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A total of 13, 455 Escherichia coli strains were isolated from 103 hens, 109 Pigs, 122 cows and 117 humans during a period from 1978 to 1979 in Gunma prefecture and tested for drug-resistance and conjugative R plasmids. About 30 E. coli strains were collected from each individual. Criteria for drug-resistance were: TC, l2.5 μg/ml; CM, 12.5 μg/ml; SM, 12.5μg/ml; SA, 200 μg/ml; KM, 25.0 μg/ml and APC, 25.0 μg/ml. The ratios of individuals that excreted drug-resistant strains and isolation frequency of drug-resistant strains among total isolates in each animal species were: hens, 100%, 95%; pigs, 100%, 95%; cows, 66%, 54% and humans, 65%, 39%. The ratios of R plasmid-bearing individuals and isolation frequency of R plasmids among strains tested were: hens, 67%, 42%; pigs, 72%, 35%; cows, 34%, 20% and humans, 19%, 19%. Doubly to quadruply resistant strains were isolated most frequently from hens and pigs; but from cows and humans single-resistant strains were isolated most frequently among resistant strains. The highly frequent appearance of drug-resistant strains and R plasmids among hens and pigs reflects the habit of heavy application of drugs.

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