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. 1994 Sep;38(9):1959–1965. doi: 10.1128/aac.38.9.1959

Assessment of mycobacterial viability by RNA amplification.

G M van der Vliet 1, P Schepers 1, R A Schukkink 1, B van Gemen 1, P R Klatser 1
PMCID: PMC284668  PMID: 7529012

Abstract

We investigated whether the presence of intact RNA is a valuable indicator of viability of mycobacteria with Mycobacterium smegmatis. M. smegmatis was exposed to various concentrations of rifampin and ofloxacin suspended in broth for different periods of time. The NASBA nucleic acid amplification system was used because of its rapid, sensitive, and specific detection of 16S rRNA. During drug exposure, the viability of the mycobacteria, expressed by the number of CFU, was compared with the presence of 16S rRNA as determined by NASBA and with the presence of DNA coding for 16S rRNA as determined by PCR. Both NASBA and PCR were shown to have a detection limit of approximately 5 x 10(2) CFU/ml. The intensity of the NASBA signal corresponded well with the number of CFU, and the lack of NASBA signal coincided with a loss of viability, which was reached after 3 days of exposure to bactericidal concentrations of both drugs. The presence of mycobacterial DNA, as determined by the intensity of the PCR signal, and the viability of M. smegmatis were not related, but an increase in the number of cells and intensity of PCR signal correlated well. Bacterial viability may thus be assessed by a rapid, sensitive, and specific, and semiquantitative technique by using NASBA. This system of viability testing provides the potential for rapid evaluation of drug susceptibility testing.

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Selected References

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