First Report in China on the Identification and Drug Sensitivity of Mycobacterium elephantis Isolated from the Milk of a Cow with Mastitis  

作　　者：JI Ling Yun XU Dong Lei YIN Shu Peng LIU Hai Can LI Gui Lian JIANG Yi WEI Jian Hao ZENG Hao LOU Yong Liang LYU Jian Xin WAN Kang Lin 

机构地区：[1]Department of Laboratory Medicine, Shanghai East Hospital Tongji University School of Medicine, Shanghai 200123, China [2]State Key Laboratory of Infectious Diseases Prevention and Control Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention Beijing 102206, China [3]Key Laboratory of Laboratory Medicine, Ministry of Education, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou 325035, Zhejiang, China [4]Department of Clinical Laboratory, Shanghai Public Health Clinical Center, Affiliated to Fudan University, Shanghai 201508, China [5]Department of Spine Surgery, The Xiangya Hospital of Central South University, Changsha 410008, Hunan, China

出　　处：《Biomedical and Environmental Sciences》2017年第7期501-507,共7页生物医学与环境科学（英文版）

基　　金：supported by the project 81401647 of Natural Science Foundation of China;Project 2014SKLID104 of State Key Laboratory for Infectious Diseases Prevention and Control;projects 16411967900 of Science and Technology Commission of Shanghai Municipality

摘　　要：Objective In this study, milk from a cow with mastitis was analyzed to determine the presence of mycobacterial infection. Milk quality and security problems pertaining to the safe consumption of dairy products were also discussed in this study. Methods Milk was preprocessed with 4% NaOH. Then, mycobacteria were isolated from the milk sample on L-J medium. The isolate was identified using multiple loci Polymerase Chain Reaction （PCR） and multi-locus sequence analysis with 16S rRNA, sodA, hsp65, and ITS genes. The drug sensitivity of the isolate to 27 antibiotics was tested through alamar blue assay. Results Smooth, moist, pale yellow colonies appeared on the L-J medium within a week after inoculation. Based on the results of multiple loci PCR analysis, the isolate was preliminarily identified as non-tuberculous mycobacteria. The 16S rRNA, SodA, hsp65, and ITS gene sequences of the isolate exhibited 99%, 99%, 99%, and 100% similarities, respectively, with those of the published reference strains of Mycobacteriurn elephantis （M. elephantis）. The drug sensitivity results showed that the strain is resistant to isoniazid, p-aminosalicylic acid, and trimesulf but is sensitive to ofloxacin, rifampicin, amikacin, capreomycin, moxifloxacin, kanamycin, levofloxacin, cycloserine, ethambutol, streptomycin, tobramycin, rifabutin, ciprofloxacin, linezolid, cefoxitin, clarithromycin, and minocycline. Conclusion To the best of our knowledge, this study is initially to report the isolation of M. elephantis from the milk of a cow with mastitis in China.Objective In this study, milk from a cow with mastitis was analyzed to determine the presence of mycobacterial infection. Milk quality and security problems pertaining to the safe consumption of dairy products were also discussed in this study. Methods Milk was preprocessed with 4% NaOH. Then, mycobacteria were isolated from the milk sample on L-J medium. The isolate was identified using multiple loci Polymerase Chain Reaction （PCR） and multi-locus sequence analysis with 16S rRNA, sodA, hsp65, and ITS genes. The drug sensitivity of the isolate to 27 antibiotics was tested through alamar blue assay. Results Smooth, moist, pale yellow colonies appeared on the L-J medium within a week after inoculation. Based on the results of multiple loci PCR analysis, the isolate was preliminarily identified as non-tuberculous mycobacteria. The 16S rRNA, SodA, hsp65, and ITS gene sequences of the isolate exhibited 99%, 99%, 99%, and 100% similarities, respectively, with those of the published reference strains of Mycobacteriurn elephantis （M. elephantis）. The drug sensitivity results showed that the strain is resistant to isoniazid, p-aminosalicylic acid, and trimesulf but is sensitive to ofloxacin, rifampicin, amikacin, capreomycin, moxifloxacin, kanamycin, levofloxacin, cycloserine, ethambutol, streptomycin, tobramycin, rifabutin, ciprofloxacin, linezolid, cefoxitin, clarithromycin, and minocycline. Conclusion To the best of our knowledge, this study is initially to report the isolation of M. elephantis from the milk of a cow with mastitis in China.

关 键 词：Key words： Non-tuberculosis mycobacterium Mycobacterium elephantis MILK Cow mastitis 

分 类 号：R446.5[医药卫生—诊断学]