- Poster presentation
- Open Access
Diagnosis of mycobacterial drug resistance in HIV reactive patients by phenotypic and genotypic assay - a comparative study
© Umamaheshwari et al; licensee BioMed Central Ltd. 2014
- Published: 27 May 2014
- Mycobacterium Avium
- Drug Susceptibility Test
- Proportion Method
- Mycobacterium Tuberculosis Complex
- Mycobacterial Strain
Emergence of drug resistance has complicated the treatment of Tuberculosis (TB). WHO reports India as one among 27 “high burden” multidrug resistant (MDR) TB countries. The study was carried out to detect drug resistance of mycobacterial isolates in HIV patients.
The clinical specimens collected from HIV seropositive AFB smear negative patients (Group A) with features of TB, AFB smear positive, HIV reactive (Group B) and AFB smear positive, HIV negative (Group C) were processed as per standard protocol. They were inoculated onto Lowenstein Jensen media and the isolates obtained were subjected to drug susceptibility test (DST) by proportion method and Genotype MTBDR plus assay.
In Group A out of 162 patients, 443 clinical samples were collected and 76 mycobacterial strains were obtained from 67 (41%) patients. In this 69 (91%) were Mycobacterium tuberculosis complex and 7 (9%) were Mycobacterium avium complex. As per phenotypic method, of 76 isolates, 50 (65.8%) were sensitive to all drugs and 26 (34.2%) resistant to one or more drugs. The MDR and resistance to at least single drug of Group A, B and C were [5 (6.6%), 2 (6.7%), 4 (8%)] and [26 (34.2%, 3(10%), 8 (16%)] respectively. MTBDR assay showed similar results except one discrepancy i.e., one isolate was resistant to rifampicin that was sensitive in proportion method.
The increase of MDRTB in high TB burden settings stresses the need for DST. This helps in providing proper treatment regimens, improve prognosis and prevent the spread of drug resistant TB.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.