In vitro drugs susceptibility and resistance mechanism investigation of Brucella isolates from Ulanqab region of Inner Mongolia
LIU Zhi-guo1, 2, WANG Miao3, LI Xiao-yan2, TA Na2, ZHAO Hong-yan1, PIAO Dong-ri1, ZHAO Zhong-zhi1, LI Zhen-jun1
1. National Institute of Infectious Diseases Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China; 2. Inner Mongolia Autonomous Region Central for Comprehensive Disease Control and Prevention, Huhhot 010031, China; 3. Ulanqab Center for Endemic Disease Control and Prevention, Ulanqab 012000, China
Abstract:The aims of this study is to investigate the antibiotics susceptibilities profiles of Brucella strains obtained from Ulanqab of Inner Mongolia. The susceptibilities of 85 B.melitensis strains to 13 common used antibiotics was detected by E-test method, and resistance mechanism of rifampin and azithromycin were preliminarily examined. Subsequently, susceptibility of 149 B. melitensis strains from China to cotrimoxazole and rifampin were tested using K-B method. The study found that the number of strains resistance to azithromycin, cotrimoxazole and rifampin was 100% (85/85),7.0% (6/85) and 1.0% (1/85), respectively. All of the tested isolates were susceptible to minocycline, sparfloxacin, doxycycline, tetracycline, streptomycin, gentamicin, levofloxacin, ciprofloxacin, cefotaxime and cefoperazone sulbactam. Of them, aparfloxacin and minocycline shows the lowest MIC90 value (0.032 μg/mL). The polymorphism of 2632 base T/C in the 23S rRNA of Brucella spp. was a potential molecular mechanism of B. melitensis in this study resistant to azithromycin. K-B method screen data indicated that all of 149 strains were susceptible to rifampin. Moreover, 25.5% (38/149) of strains were resistance to cotrimoxazole and these resistance strains were distributed in 18 different provinces of China. In conclusion, the situation of antibiotics resistance of B. melitensis clinical isolates was rather serious in Ulanqab region, surveillance of changes in antibiotic susceptible should be regular implemented. Moreover, we suggest that both minocycline and sparfloxacin could be as first-line agents for treatment of brucellosis.
刘志国, 王妙, 李晓燕, 塔娜, 赵鸿雁, 朴东日, 赵忠志, 李振军. 内蒙古乌兰察布地区布鲁氏菌体外药物敏感性及耐药机制分析[J]. 中国人兽共患病学报, 2019, 35(5): 393-398.
LIU Zhi-guo, WANG Miao, LI Xiao-yan, TA Na, ZHAO Hong-yan, PIAO Dong-ri, ZHAO Zhong-zhi, LI Zhen-jun. In vitro drugs susceptibility and resistance mechanism investigation of Brucella isolates from Ulanqab region of Inner Mongolia. Chinese Journal of Zoonoses, 2019, 35(5): 393-398.
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