A rapid detection of multidrug-resistant Mycobacterium tuberculosis by a nitrate reductase assay on blood agar
The susceptibility of 49 Mycobacterium tuberculosis clinical isolates to isoniazid (INH) and rifampisin (RIF) (28 multi-drug resistant-tuberculosis samples) was determined by a nitrate reductase assay (NRA) on blood agar. Agreement between the NRA and other testing methods was found to be 93.8% for...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Instituto Oswaldo Cruz, Ministério da Saúde
2011-05-01
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| Series: | Memórias do Instituto Oswaldo Cruz. |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762011000300022&lng=en&tlng=en |
| Summary: | The susceptibility of 49 Mycobacterium tuberculosis clinical isolates to isoniazid (INH) and rifampisin (RIF) (28 multi-drug resistant-tuberculosis samples) was determined by a nitrate reductase assay (NRA) on blood agar. Agreement between the NRA and other testing methods was found to be 93.8% for both INH and RIF. The sensitivity, specificity, positive predictive value and negative predictive value for INH were 92.8%, 94.2%, 86.6% and 97%, respectively. The sensitivity, specificity, positive predictive value and negative predictive value for RIF were 90.4%, 96.4%, 95% and 93.1%. In conclusion, we show here that blood agar can be used effectively for the NRA test. |
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| ISSN: | 1678-8060 |