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Journal of Clinical Microbiology, Mar 1997, 719-723, Vol 35, No. 3
A Telenti, N Honore, C Bernasconi, J March, A Ortega, B Heym, HE Takiff and ST Cole
Progress in understanding the basis of resistance to isoniazid (INH) and
rifampin (RMP) has allowed molecular tests for the detection of
drug-resistant tuberculosis to be developed. Consecutive isolates (n = 95)
of Mycobacterium tuberculosis, from a Spanish reference laboratory
investigating outbreaks of multidrug-resistant tuberculosis, were coded and
sent to two external laboratories for genotypic analysis of INH and RMP
resistance by PCR-single-strand conformation polymorphism (SSCP) analysis
of specific regions of four genes: part of the coding sequence of katG and
the promoter regions of inhA and ahpC for INH and the RMP resistance region
of rpoB. After correction for the presence of outbreak strains and multiple
isolates from single patients, RMP resistance was detected successfully by
PCR-SSCP in > 96% of the RMP- resistant strains. PCR-SSCP had a
sensitivity of 87% for INH resistance detection, and mutations in katG,
inhA, katG-inhA, ahpC, and katG-ahpC were identified in 36.8, 31.6, 2.6,
13.2, and 2.6%, respectively, of the unique strains. Specificity was 100%.
Molecular detection of resistance to the two main antituberculous drugs,
INH and RMP, can be accomplished accurately by using a strategy which
limits analysis to four genetic regions. This may allow the expedient
analysis of drug resistance by reference laboratories.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Genotypic assessment of isoniazid and rifampin resistance in Mycobacterium tuberculosis: a blind study at reference laboratory level
Institut fur Medizinische Mikrobiologie, Universitat Bern, Switzerland. telenti@imm.unibe.ch
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