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KMID : 1171820080230020071
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Journal of Environmental and Sanitary Engineering
2008 Volume.23 No. 2 p.71 ~ p.79
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Antimicrobial Agent and Chlorine Susceptibility of E. coli Group Isolated from Natural Drinking Water in Northern Gyeongbuk Area
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Sohn Chang-Kyu
Lee Chun-Woo
Kim Tae-Bun
Park Soon-Geel
Jeon Chan-Jun
Lee Chang-Il
Park Ja-Young
Song Sung-Bok
He Weon
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Abstract
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We examined 165 unchlorinated natural drinking water samples for the presence of E. coli group resistant to antimicrobial agent and chlorine in nothern Gyeongbuk area in 2007. Among 165 water samples, 21 samples(12.7%) were positive to total coliforms and Six genus, 16 strains of E. coli groups isolated from 16 samples showed resistance against more than one antimicrobial agent such as Ampicillin, Tetracycline and Chloroamphenicol. Among 16 strains, 14 strains resistant to Ampicillin, 9 strains resistant to Tetracycline and one strain resistant to Chloroampenicol. but all 16 strains did not contain any integron gene cassettes, which contribute to the spread of antimicrobial resistance alleles by lateral gene transfer of gene cassettes in a variety of enteric bacteria. The minimal inhibitory concentration(MIC) of 14 strains which showed resistant to Ampicillin was between 12㎍/㎖ and 32㎍/㎖, Nine strains resistant to Tetracycline showed between 32㎍/㎖ and 128㎍/㎖ and one strain resistant to Chloroampenicol showed 128㎍/㎖. The chlorine sensitivity of 16 strains isolated from unchlorinated natural water sample didnot show any difference among strains by the concentration of initial free chlorine and elapsed time after chlorine treatment. All 16 strains were killed after 1hr. exposure at 0.2㎎/㎖ of free chlorine per liter or 30minutes exposure at 0.4㎎/㎖ of free chlorine per liter.
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KEYWORD
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Natural drinking water, E. coli group, Antimicrobial agent and chlorine susceptibility
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