Background: Heteroresistance is the coexistence of susceptible and resistant strains in the same individual, considered the preliminary step for total resistance, and can stem from mixed infection or clonal heterogeneity. The aim of this study was to evaluate the heteroresistance of Mycobacterium tuberculosis to rifampicin and isoniazid and its characterization.
Method: GenoType MTBDRplus; Sanger sequencing of the rpoB, katG, and inhA genes; and Mycobacterial Interspersed Repetitive Unit - Variable Number Tandem Repeat (MIRU-VNTR) were performed.
Results: In a total of 654 isolates, 530 were resistant, 124 were susceptible, and 29 were heteroresistant to a first-line drug. GenoType MTBDRplus detected heteroresistance in the rpoB gene in 26/29 (89.6%), as compared to 5/29 (17.2%) in the katG gene and 2/29 (6.8%) in the inhA gene. Four isolates showed heteroresistance in these genes. The Sanger sequencing detected heteroresistance in the rpoB gene in 7/29 (24.1%), as compared to 3/29 (10.3%) in the katG gene. In one isolate, heteroresistance was concomitant in both the rpoB and katG genes. MIRU-VNTR detected mixed infection in three heteroresistant isolates, while four isolates showed clonal heterogeneity.
Conclusions: GenoType MTBDRplus detected more cases of heteroresistance when compared to sequencing. It was also possible to characterize mixed infection and clonal heterogeneity by MIRU-VNTR.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.4103/ijmy.ijmy_132_20 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Genital orf.
BMJ Case Rep
January 2025
Dermatology, Ninewells Hospital and Medical School Department of Dermatology, Dundee, UK.
A man in his early 40s presented with extensive skin lesions in the groin and genital regions. The lesions were erythematous and maculopapular but evolved into vesicles and pustules with surrounding cellulitis. He stated that he grips livestock between his legs for sheep shearing.
View Article and Find Full Text PDFCo-infections with Bordetella bronchiseptica in canine: A systematic review and meta-analysis.
Vet Immunol Immunopathol
January 2025
Department of Infectious Disease, College of Veterinary Medicine, Seoul National University, Seoul, Korea; Research Institute for Veterinary Science and BK21, Seoul National University, Seoul, Korea. Electronic address:
Background: Bordetella bronchiseptica is a primary pathogen in canine infectious respiratory disease (CIRD), or kennel cough, capable of independently causing respiratory illness and contributing significantly to co-infections with other viral and bacterial agents. Despite its critical role in disease transmission and persistence, the epidemiology of B. bronchiseptica in CIRD remains poorly understood.
View Article and Find Full Text PDFEfficacy of a high dose of isometamidium chloride treatment in single and mixed experimental infections with T. congolense and T. brucei brucei in dogs.
Comp Immunol Microbiol Infect Dis
January 2025
Department of Veterinary Parasitology and Entomology, Faculty of Veterinary Medicine, University of Nigeria, Nsukka, Enugu State, Nigeria.
Canine African trypanosomosis is endemic in sub-Saharan Africa. Chemotherapy remains the commonly employed approach to trypanosomosis control. However, it is beleaguered by the absence of new drugs, treatment failures, relapse infection and resistance.
View Article and Find Full Text PDFMany inflammatory stimuli can induce progenitor cells in the bone marrow to produce increased numbers of myeloid cells as part of the process of emergency myelopoiesis. These events are associated with innate training and can have long-term impacts on hematopoietic stem and progenitor cell (HSPC) development but can also compromise their function. While many cytokines support emergency myelopoiesis, less is known about the mechanisms that temper these events.
View Article and Find Full Text PDFMalaria and Dengue Co-infection: A Comprehensive Study in Peshawar, Pakistan.
Cureus
December 2024
Internal Medicine, Medical Teaching Institution (MTI) Hayatabad Medical Complex, Peshawar, PAK.
Background: Malaria and dengue are significant mosquito-borne diseases prevalent in tropical and subtropical climates, with increasing reports of co-infections. This study aimed to determine the frequency, patterns, and risk factors of these co-infections in Peshawar.
Methods: A cross-sectional study was conducted from June to December 2023 in three tertiary care hospitals in Peshawar.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!