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KMID : 0359319790190010075
Korean Journal of Veterinary Research
1979 Volume.19 No. 1 p.75 ~ p.83
Sensitivity of Pathogens of Bovine Udder Origin to Antibiotics
조성환/Cho, Sung Whan
박청규/조용준/정종식/Park, Cheong Kyu/Cho, Yoong Jun/Chung, Jong Sig
Abstract
The sensitivities of 270 pathogens (124 Streptococci, 118 Staphylococci, 10 Corynebacterium pyogenes and 18 Escherichia coli) isolated from clinical or subclinical cases of bovine mastitis during lactation to 11 antibiotics were determined by the agar plate dilution method.
All cultures of Streptococci were inhibited at 1.56㎍/㎖ of ampicillin and 1.56 units/㎖ of penicillin G. Most of the cultures were inhibited at 3.125㎍/㎖ of leukomycin, but were resistant to kanamycin, streptomycin, chloramphenicol, erythromycin and colistin at concentration of 12.5㎍/㎖.
More than 93% of the Staphlococcal cultures were sensitive to kanamycin, leukomycin, ampicillin, tetracycline, ledermycin and minocycline at concentrations of 12.5㎍/㎖ or less, and sensitive to penicillin at concentration of 3.125 units/㎖, but for more than 71% of the cultures to chloramphenicol, erythromycin and colistin the concentrations required to inhibit growth were 100 ㎍/㎖ or higher.
All 10 cultures of Corynebacterium pyogenes were inhibited by leukomycin, ampicillin and minocycline at concentration of 1.56㎍/㎖ and by penicillin G at concentration of 0.78 units/㎖, but all the cultures required at least 400㎍/㎖ or higher of streptomycin, erythromycin and colistin for inhibition.
More than 83% of E. coli cultures were sensitive to erythromycin and minocycline at concentration of 12.5㎍/㎖, but resistant to leukomycin and chloramphenicol at concentration of 100μ8/㎖.
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