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題 名 | 氯四環黴素與枯草菌素對大腸桿菌與糞腸球菌抗菌劑感受性與tet表現之影響=The Effects of Chlortetracycline and Bacitracin on Antimicrobial Susceptibility and tet in Escherichia Coli and Enterococcus Faecalis Isolates from Broiler Chicken |
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作 者 | 郭鴻志; 陳保基; 魏恒巍; 張紹光; | 書刊名 | 臺灣獸醫學雜誌 |
卷 期 | 35:3 2009.09[民98.09] |
頁 次 | 頁199-208 |
分類號 | 437.714 |
關鍵詞 | 氯四環黴素; 枯草菌素; 抗菌劑最小抑制濃度; 抗藥性基因; Chlortetracycline; Bacitracin; Minimum inhibitory concentration; Resistance gene; |
語 文 | 中文(Chinese) |
中文摘要 | 試驗雞隻於一日、三週及六週齡時,進行肛門拭子採樣、分離及進行抗菌劑的抗菌劑感受性試驗,用以探討氯四環黴素(55ppm)與枯草菌素(55ppm)兩種含藥物飼料添加物,對兩種腸道指標性細菌(大腸桿菌與糞腸球菌)藥物感受性及四環黴素類抗藥性基因表現的影響。結果顯示,對照組和此兩種抗生素處理組所分離的大腸桿菌對愛黴素與三種四環黴素類抗菌劑的最小抑制濃度均隨著日齡增加而顯著上升,而枯草菌素處理組六週齡雞隻的糞腸球菌對於枯草菌素的抗藥性比例與MIC值亦有顯著上升(p=0.037與0.028)。對大腸桿菌抗四環黴素類的抗藥性基因而言,主要以tet(A)與tet(B)為主。對腸球菌而言,抗藥性基因則以tet(L)與tet(M)為主。此結果亦顯示,即使抗菌劑具有相似的抗藥性表現型,其造成的機制亦可能並不相同。 |
英文摘要 | The effects of feed supplementation with two approved animal growth promoters, chlortetracycline (55ppm) and bacitracin (55ppm) were evaluated for the incidence and distribution of antibiotic susceptibility and the carrying of tetracycline resistance genes in Escherichia coli and Enterococcus faecalis isolates from broiler chickens. Bacterial were isolated at one-day, three-weeks and six-weeks old. The experiment results indicated that the levels of minimum inhibitory concentrations (MICs) for amikacin (p<0.001), doxycycline (p<0.05), chlortetracycline (p<0.001), and oxytetracycline (p<0.05) were significantly increasing in E. coli isolates from control and two treated groups with age increasing. The MICs and the percentage of resistance to bacitracin were significantly higher in E. faecalis isolates from bacitracin treated group than from other groups (P=0.028 and 0.037). All tetracycline-resistant strains were assessed for carrying of the tetracycline resistance genes. The tet (A) and tet (B) were the most commonly observed genes in E. coli but the tet (L) and tet (M) had higher percentage in E. faecalis. These results indicated that bacteria can produce different mechanisms to resisting a single antibiotic. Even bacteria showing same resistant phenotype, the underlying mechanisms may be different. |
本系統中英文摘要資訊取自各篇刊載內容。