Volume 11, Issue 4 (12-2023)                   JoMMID 2023, 11(4): 174-178 | Back to browse issues page

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Ahmadi K, Madadi-Goli N, Masoumi M, Nasehi M, Siadat S D, Vaziri F et al . Analyzing Antibiotic Resistance in Clinical Mycobacterium tuberculosis Isolates using Microplate Alamar Blue Assay. JoMMID 2023; 11 (4) :174-178
URL: http://jommid.pasteur.ac.ir/article-1-625-en.html
Analyzing Antibiotic Resistance in Clinical Mycobacterium tuberculosis Isolates using Microplate Alamar Blue Assay
Kamal Ahmadi , Nahid Madadi-Goli , Morteza Masoumi , Mahshid Nasehi , Seyed Davar Siadat , Farzam Vaziri , Abolfazl Fateh *
Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
Abstract:   (1090 Views)
Introduction: Tuberculosis, caused by Mycobacterium tuberculosis, is one of the most common infectious diseases worldwide. Epidemiological studies of M. tuberculosis drug resistance are critical for improving patient treatment approaches and controlling the spread of tuberculosis. The present study aimed to determine antibiotic resistance among M. tuberculosis clinical isolates using the Microplate Alamar Blue Assay (MABA). Methods: In this descriptive cross-sectional study, 25 M. tuberculosis isolates from clinical samples were identified and confirmed using standard microbiological and biochemical tests. Then, the MIC for the antibiotics Bedaquiline, isoniazid, rifampin, ethambutol, ofloxacin, moxifloxacin, capreomycin, and streptomycin was determined using the MABA method. The results were analyzed using SPSS version 16 software. Results: Among the 25 investigated isolates, the frequencies for MDR, Pre-XDR, and XDR isolates were 20%, 8%, and 32%, respectively. The highest rate of drug resistance was to isoniazid (80%), rifampicin, and ethambutol (76%), and the highest rate of sensitivity was to moxifloxacin (68%). The frequency of isoniazid mono-resistance and rifampicin mono-resistance was 5 cases (50%) and 4 cases (40%), respectively. Conclusion: Our study revealed an alarming rate of MDR and XDR M. tuberculosis strains, indicating that current first-line treatments may be ineffective for a significant number of patients. The bedaquiline resistance among the isolates with no history of previous exposure to this drug suggests unexplored resistance mechanisms. Molecular techniques to accurately identify these mechanisms may contribute to developing more effective treatment strategies to combat drug-resistant tuberculosis.
Keywords: Mycobacterium tuberculosis, Bedaquiline, Microplate Alamar Blue Assay, Multi-drug resistance, Extensive drug-resistant tuberculosis
Full-Text [PDF 807 kb]   (309 Downloads)    
Type of Study: Original article | Subject: Anti-microbial agents, resistance and treatment protocols
Received: 2023/11/21 | Accepted: 2023/12/10 | Published: 2024/02/24
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.