High Proportion of Heteroresistance ingyrAandgyrBin Fluoroquinolone-Resistant Mycobacterium tuberculosis Clinical Isolates
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چکیده
منابع مشابه
High proportion of heteroresistance in gyrA and gyrB in fluoroquinolone-resistant Mycobacterium tuberculosis clinical isolates.
Heteroresistance is the coexistence of populations with differing nucleotides at a drug resistance locus within a sample of organisms. Although Sanger sequencing is the gold standard for sequencing, it may be less sensitive than deep sequencing for detecting fluoroquinolone heteroresistance in Mycobacterium tuberculosis. Twenty-seven fluoroquinolone monoresistant and 11 fluoroquinolone-suscepti...
متن کاملHigh proportion of fluoroquinolone-resistant Mycobacterium tuberculosis isolates with novel gyrase polymorphisms and a gyrA region associated with fluoroquinolone susceptibility.
Fluoroquinolone resistance in Mycobacterium tuberculosis can be conferred by mutations in gyrA or gyrB. The prevalence of resistance mutations outside the quinolone resistance-determining region (QRDR) of gyrA or gyrB is unclear, since such regions are rarely sequenced. M. tuberculosis isolates from 1,111 patients with newly diagnosed culture-confirmed tuberculosis diagnosed in Tennessee from 2...
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The presence of heteroresistance was represented by 23% of 235 fluoroquinolone (FQ)-resistant Mycobacterium tuberculosis isolates in Beijing, China, from 2008 to 2010. The main mechanism of FQ heteroresistance is due to the segregation of a single M. tuberculosis strain in patients; the majority of isolates with multidrug-resistant tuberculosis contained a mixture of bacterial subpopulations co...
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Isoniazid, is the only antituberculous drug for which the relation between lack of virulence and acquisition of resistance was associated. INH-resistant mutants were shown to contain defective katG gene. Classical studies showed that INH-resistant south Indian isolates have lower virulence in guinea pigs and higher susceptibility to H2O2. It is of interest to assess the virulence in south India...
متن کاملFluoroquinolone resistance associated with specific gyrase mutations in clinical isolates of multidrug-resistant Mycobacterium tuberculosis.
Fluoroquinolones are potent antibacterial agents being used clinically against multidrug-resistant tuberculosis. Treatment failure is thought to arise from acquisition of fluoroquinolone resistance by Mycobacterium tuberculosis. A collection of 13 resistant clinical isolates of M. tuberculosis was examined for ciprofloxacin sensitivity relative to controls exhibiting the same IS6110 DNA type. S...
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ژورنال
عنوان ژورنال: Antimicrobial Agents and Chemotherapy
سال: 2014
ISSN: 0066-4804,1098-6596
DOI: 10.1128/aac.02066-13