Quality control ranges for testing broth microdilution susceptibility of Flavobacterium columnare and F. psychrophilum to nine antimicrobials

Diseases of Aquatic Organisms

Patricia S. Gaunt¹  Tamara D. Mayer¹  Tina C. Crosby¹  Ahmed M. Darwish¹  Jeremy Carson¹  Inger Dalsgaard¹  Dana X. Gao¹  Tsang L. Lin¹  Ching C. Wu¹  Hui-Min Hsu¹  Melissa Pyecroft¹  J. Lindsay Oaks¹  Temdoung Somsiri¹  Charlene Teitzel¹  Charles M. Gieseker¹ 

关键词: Standard methods;    Antimicrobial susceptibility testing;    Fish;    Flavobacteria;   

DOI  :  10.3354/dao02527

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: A multi-laboratory broth microdilution method trial was performed to standardize the specialized test conditions required for the fish pathogens Flavobacterium columnare and F. psychrophilum. Nine laboratories tested the quality control (QC) strains Escherichia coli ATCC 25922 and Aeromonas salmonicida subsp. salmonicida ATCC 33658 against 10 antimicrobials (ampicillin, enrofloxacin, erythromycin, florfenicol, flumequine, gentamicin, ormetoprim/sulfadimethoxine, oxolinic acid, oxytetracycline, and trimethoprim/sulfamethoxazole) in diluted (4 g l⁻¹) cation-adjusted Mueller-Hinton broth incubated at 28 and 18°C for 44�?48 and 92�?96 h, respectively. QC ranges were set for 9 of the 10 antimicrobials. Most of the minimal inhibitory concentration (MIC) distributions (16 of 18, 9 drugs at both temperatures) for A. salmonicida ATCC 33658 were centered on a single median MIC ± 1 two-fold drug dilution resulting in a QC range that spanned 3 dilutions. More of the E. coli ATCC 25922 MIC distributions (7 of 16) were centered between 2 MIC dilutions requiring a QC range that spanned 4 dilutions. A QC range could not be determined for E. coli ATCC 25922 against 2 antimicrobials at the low temperature. These data and their associated QC ranges have been approved by the Clinical and Laboratory Standards Institute (CLSI), and will be included in the next edition of the CLSI M49-A Guideline. This method represents the first standardized reference method for testing fish pathogenic Flavobacterium spp.

【 授权许可】

Unknown