Korean Journal of Veterinary Research 2008;48(3):295-303.
Antimicrobial resistance and distribution of tetracycline resistance determinants in Escherichia coli isolated from aquatic birds
Jae-Keun Cho1, Sang-Min Lee2, Ki-Seuk Kim2
1Health & Environmental Research Institute
2College of Veterinary Medicine, Kyungpook National University
수생조류에서 분리한 대장균의 항균제 내성 및 Tetracycline 내성인자의 분포
조재근1, 이상민2, 김기석2
1대구광역시 보건환경연구원
2경북대학교 수의과대학
One hundred and sixty nine Escherichia (E.) coli strains isolated from fecal samples of aquatic birds in Geumho river basin and Dalseong park were tested by agar dilution method to determine their susceptibility patterns to 14 antimicrobial agents. The distribution of tetracycline resistance determinants (tetA, tetB, tetC, tetD and tetE) were also examined by PCR in 76 tetracycline-resistant ($TC^r$) E. coli isolates. The high resistance was observed in tetracycline, cephalothin and ampicillin (45.0~36.7%). Resistance of E. coli isolates derived from Dalseong park to tetracycline, cephalothin, ampicillin and streptomycin (65.7~44.8%) were significantly higher than those isolated from Geumho river basin (31.4~14.7%). About seventy percent (70.4%) of the strains isolated were resistant to one or more drugs tested. Thirty (39.5%) of 76 $TC^r$ E. coli isolates which were resistant to one or more drugs transferred all or a part of their resistance patterns to the recipient strain of E.coli J53 by conjugation. All of $TC^r$ E. coli isolates contained at least one or more of 5 tet genes examined. The most common genes found in these isolates were tetA (60.6%) and followed by tetB (7.9%) and tetC (1.3%). However, tetD and tetE were not found in any of the isolates tested. Twenty one (27.6%) of $TC^r$ E. coli isolates had two determinants, tetA/tetB (20 strains), tetA/tetC (1 strain). And two strains (2.6%) contained three determinants (tetA/tetB/tetC).
Key Words: antimicrobial agents, aquatic birds, Escherichia coli, PCR, tetracycline resistance

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