Publication date: Available online 16 March 2017
Source:Journal of Dairy Science
Author(s): Dong-Seob Tark, Dong Chan Moon, Hee Young Kang, Su-Ran Kim, Hyang-Mi Nam, Hee-Soo Lee, Suk-Chan Jung, Suk-Kyung Lim
In this study, we aimed to assess trends in antimicrobial resistance and to investigate the characteristics of extended-spectrum β-lactamase (ESBL)-producing isolates from bovine mastitic milk from 2012 to 2015. A total of 374 Escherichia coli isolates were analyzed (154 in 2012, 113 in 2013, 76 in 2014, and 31 in 2015). No consistent trends in antimicrobial resistance of E. coli isolates occurred during the 4-yr period. The most frequently observed resistance was tetracycline (23.3%), followed by streptomycin (17.1%), ampicillin (16.6%), neomycin (11.8%), and trimethoprim/sulfamethoxazole (11.2%). Multidrug resistance was observed in 15.5% of isolates. Among these isolates, 15 (4.0%) carried one or more blaCTX-M and AmpC ESBL genes from 11 different farms, including blaCTX-M-15 at 4 farms, blaCTX-M-3 at 2 farms, blaCTX-M-1 at 3 farms, and blaCMY-2 at 3 farms. This study is the first report of blaCTX-M-3-producing E. coli in dairy milk. Transfer of ESBL was observed in 3 blaCTX-M-3-producing isolates, 1 blaCTX-M-1-producing isolate, and all 3 blaCMY-2-producing isolates. Almost all blaCTX-M-15 and blaCTX-M-1 genes possessed an insertion sequence, ISECP1, upstream of the blaCTX-M gene. Identical pulsed-field gel electrophoresis profiles were also observed in blaCTX-M-producing E. coli from the same farm. These results suggested that ESBL might spread by both clonal and horizontal spread in dairy farms in South Korea. Although no significant changes occurred in the antimicrobial resistance of E. coli during the 4-yr study period, the resistance rates and presence of ESBL were high compared with those in other countries. Thus, these findings suggest the importance of control measures for E. coli, particularly ESBL-producing bacteria, on dairy farms to reduce treatment failure and transmission to humans.
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Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
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00306932607174
alsfakia@gmail.com
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