Inter- and intra-assay reproducibility of microplate Alamar blue assay results for isoniazid, rifampicin, ethambutol, streptomycin, ciprofloxacin, and capreomycin drug susceptibility testing of Mycobacterium tuberculosis.

BrianLeonard; JorgeCoronel; MarkSiedner; LouisGrandjean; LuzCaviedes; PilarNavarro; Robert HGilman; David AJ Moore ORCID logo; (2008) Inter- and intra-assay reproducibility of microplate Alamar blue assay results for isoniazid, rifampicin, ethambutol, streptomycin, ciprofloxacin, and capreomycin drug susceptibility testing of Mycobacterium tuberculosis. Journal of clinical microbiology, 46 (10). pp. 3526-3529. ISSN 0095-1137 DOI: 10.1128/JCM.02083-07
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The intersample and intrasample variability of the results obtained with the microplate Alamar blue assay for the indirect drug susceptibility testing of Mycobacterium tuberculosis was investigated. Between 1.2 and 8.5% of paired MICs differed by more than one twofold dilution, resulting in discordant susceptible-resistant designations at frequencies between 0.6% (rifampin) and 18.9% (ethambutol).


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