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. 1995 Feb;33(2):322–328. doi: 10.1128/jcm.33.2.322-328.1995

Detection of Mycobacterium tuberculosis directly from spiked human sputum by Q-beta replicase-amplified assay.

J S Shah 1, J Liu 1, D Buxton 1, B Stone 1, R Nietupski 1, D M Olive 1, W King 1, J D Klinger 1
PMCID: PMC227941  PMID: 7536213

Abstract

We report on a rapid, sensitive, Q-Beta replicase-amplified nucleic acid hybridization assay for the detection of Mycobacterium tuberculosis directly from spiked human sputum. Specimens were processed by either an N-acetyl-L-cysteine-NaOH or a 2% NaOH digestion-decontamination method and then washed to neutralize the pH of the cell pellet. The washed sputum pellets were heated at 100 degrees C to inactivate the M. tuberculosis organisms. The heat-inactivated samples were mechanically lysed at 5,000 rpm for 6 min in the GENE-TRAK Sample Processing Instrument in the presence of zirconium oxide beads and a buffer containing guanidine thiocyanate. The released nucleic acid was subjected to the GENE-TRAK Q-Beta replicase-amplified, dual-capture assay. The assay sensitivity was 10(3) purified rRNA targets or 1 CFU of M. tuberculosis spiked into M. tuberculosis-negative human sputum. There was a low level of noise because of the limitations of performing a signal amplification assay in an open system. High levels of other mycobacterial rRNA (approximately 10(7) organisms), including rRNAs of Mycobacterium avium and Mycobacterium gordonae, did not interfere with the sensitivity of the assay.

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Selected References

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