| Studies on the biochemical characteristics and plasmid profiles of Salmonella typhimurium isolated from pigeons and aquatic birds |
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No-chan Park1, Won-pil Choi2 |
1Kyungpook Animal Health Laboratory
2College of Veterinary Medicine, Kyungpook National University |
| 비둘기 및 수생조류(水生鳥類) 유래(由來) Salmonella typhimurium의 생물화학적(生物化學的) 특성(特性)과 plasmid profile에 관(關)한 연구(硏究) |
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박노찬1, 최원필2 |
1경북축산위생시험소
2경북대학교 수의과대학 |
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| Abstract |
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A total of 166 strains of Salmonella (S) typhimurium var copenhagen isolated from pigeons (164 strains) and aquatic birds (2 strains) were examined for the biochemical characteristics and plasmid profiles. All the strains were sensitive to ampicillin, chloramphenicol, gentamicin, kanamycin and sulfadimethoxine. But 13 strains(7.8%) were resistant to streptomycin (Sm), 2 (1.2%) to tetracycline, 2 (1.2%) to rifampicin, and 1 (0.6%) to nalidixic acid. Among drug resistant strains, only one strain resistant to Sm contained conjugative R plasmid which was fertility inhibition and incompatibility group $I_{alpha}$. All the strains were sensitive to cobalt chloride, cupric sulfate, lead nitrate, mercuric chloride and silver nitrate. Of 166 isolates, 6 (3.6%) were resistant to sodium arsenate and 1 (0.6%) to potassium tellurite. Among 166 isolates, 1 (0.6%) was colicinogenic, 12 (7.2%) sucrose fermenters, and 166 (100%) maltose fermenters. Plasmid profiles were confirmed as being 4 or 5 plasmids, and their molecular weight ranged 3.2 to 60 megadalton (MD). All the strains harbored 60 Md plasmid. There are three patterns by the plasmid profile, 150 isolates (90.4%) were pattern I (3.2, 3.5, 33, 60Md), 14 (8.4%) pattern II (3.2, 3.5, 29, 60Md), and 2 (1.2%) pattern III (4.2, 7.8, 8.5, 15, 60Md). S typhimurium var copenhagen strains containing 60Md plasmid were resistant to killing by 90% normal guinea pig serum. |
| Key Words:
Salmonella typhimurium var copenhagen, plasmid profile, serum resistance, heavy metal susceptibility, pigeon |
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