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• W2099652589 abstract "ABSTRACT Numerous assays have been described for the detection of DNA and rRNA sequences that are specific for the Mycobacterium tuberculosis complex. Although beneficial to initial diagnosis, such assays have proven unsuitable for monitoring therapeutic efficacy owing to the persistence of these nucleic acid targets long after conversion of smears and cultures to negative. However, prokaryotic mRNA has a typical half-life of only a few minutes and we have previously shown that the presence of mRNA is a good indicator of bacterial viability. The purpose of the present study was to develop a novel reverse transcriptase-strand displacement amplification system for the detection of M. tuberculosis α-antigen (85B protein) mRNA and to demonstrate the use of this assay in assessing chemotherapeutic efficacy in patients with pulmonary tuberculosis. The assay was applied to sequential, noninduced sputum specimens collected from four patients: 10 of 11 samples (91%) collected prior to the start of therapy were positive for alpha-antigen mRNA, compared with 1 of 8 (13%), 2 of 8 (25%), 2 of 8 (25%), and 0 of 8 collected on days 2, 4, 7, and 14 of treatment, respectively. In contrast, 39 of 44 samples (89%) collected on or before day 14 were positive for α-antigen DNA. The loss of detectable mRNA corresponded to a rapid drop over the first 4 days of treatment in the number of viable organisms present in each sputum sample, equivalent to a mean fall of 0.43 log 10 CFU/ml/day. Analysis of mRNA is a potentially useful method for monitoring therapeutic efficacy and for rapid in vitro determination of drug susceptibility." @default.
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• W2099652589 date "1999-03-01" @default.
• W2099652589 modified "2023-10-15" @default.
• W2099652589 title "Detection of Viable <i>Mycobacterium tuberculosis</i> by Reverse Transcriptase-Strand Displacement Amplification of mRNA" @default.
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• W2099652589 doi "https://doi.org/10.1128/jcm.37.3.518-523.1999" @default.
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