The global control of tuberculosis remains a challenge from the standpoint of diagnosis, detection of drug resistance, and treatment. Because treatment can only be initiated when infection is detected and is based on the results of antimicrobial susceptibility testing, there recently has been a marked increase in the development and testing of novel assays designed to detect Mycobacterium tuber...

This prospective study evaluated the performance of the microscopic observation drug susceptibility (MODS) assay for the direct detection of Mycobacterium tuberculosis drug resistance. MODS assay sensitivity, specificity, and positive and negative predictive values were 96.7% (95% confidence interval [95% CI], 92.1 to 98.8%), 78.4% (95% CI, 73.5 to 80.6%), 82.4% (95% CI, 78.4 to 84.2%), and 95....

BACKGROUND The emergence of multidrug-resistant strains is a major health problem especially for countries with high TB incidence such as Peru. In this study, we evaluated High Resolution Melting (HRM) assay in Peruvian isolates for the detection of mutations within rpoB, katG genes and promoter region inhA to determine isoniazid and rifampicin resistance in Mycobacterium tuberculosis (Mtb). ...

Our objective was to evaluate the feasibility of a molecular assay based on a real-time PCR technique, carried out with a LightCycler instrument (Roche Biochemicals), to identify Mycobacterium tuberculosis bacilli and to detect rifampin and isoniazid resistance in DNA extracts from sputum samples. We studied three genes: rpoB, which is associated with rifampin resistance, and katG and inhA, whi...

Introduction. Mycobacterium tuberculosis is the causative agent of tuberculosis. Drug susceptibility testing performed by phenotypic and molecular tests. Commonly used for drug automated BACTEC system in a liquid culture medium. line probe tests was introduced almost 15 years ago. Recently whole genome sequencing (WGS) analysis M. strains demonstrated that genotyping drug-resistance could be ac...

Several treatment regimens have been recommended for the treatment of isoniazid-resistant tuberculosis (TB). However, an optimal regimen and duration for this treatment remains a matter of some controversy. Here, we would like to share our experience in a case of pulmonary TB with acquired multidrug resistance, during a 12-month treatment of isoniazid-resistant TB with rifampin and ethambutol, ...

In 2004, identification of patients infected with the same Mycobacterium tuberculosis strain in New York, New York, USA, resulted in an outbreak investigation. The investigation involved data collection and analysis, establishing links between patients, and forming transmission hypotheses. Fifty-four geographically clustered cases were identified during 2003-2009. Initially, the M. tuberculosis...

OBJECTIVE To identify recent trends in, and factors associated with, resistance to antituberculosis drugs in England, Wales, and Northern Ireland. DESIGN Cohort of tuberculosis cases reported to the enhanced tuberculosis surveillance system matched to data on drug susceptibility and national strain typing data. SETTING England, Wales, and Northern Ireland 1998-2005. MAIN OUTCOME MEASURES ...

Study Background: Drug resistance in Mycobacterium tuberculosis is a serious problem all over the world. One of the major factors contributing to drug resistance is delayed detection of drug-resistant isolates, which ultimately leads to delay in initiation of effective chemotherapy. An appropriate modification of treatment regimens, depending upon the susceptibility pattern of Mycobacterium iso...

Novel mutations in NADH dehydrogenase (ndh) were detected in 8 of 84 (9.5%) isoniazid (INH)-resistant isolates (T110A [n = 1], R268H [n = 7]), but not in 22 INH-susceptible isolates of Mycobacterium tuberculosis. Significantly, all eight isolates with mutations at ndh did not have mutations at katG, kasA, or the promoter regions of inhA or ahpC, except for one isolate. Mutations in ndh appear t...