INTRODUCTION The prevalence of drug resistance in clinical isolates of Mycobacterium tuberculosis from the Gulf Cooperation Council (GCC; Saudi Arabia, Qatar, Bahrain, Kuwait, Oman, United Arab Emirates [UAE]) countries was appraised using reports published between January 2002 and March 2013. METHODOLOGY A total of 11,393 tuberculosis (TB) isolates from the GCC were studied through published...

BACKGROUND Tuberculosis (TB) and HIV rates continue to escalate in Russia, but true rates for drug resistance, especially multidrug resistant tuberculosis (MDR TB), are unknown. A study was conducted with the aims of identifying first line drug resistance, both in the civilian and prison sectors, for new and previously treated cases; and risk factors for the development of drug resistance. ME...

Seventy-four Mycobacterium tuberculosis clinical isolates from China were subjected to drug susceptibility testing using ethambutol, isoniazid, rifampin, and ofloxacin. The results revealed that the presence of embB mutations did not correlate with ethambutol resistance but was associated with multiple-drug resistance, especially resistance to both ethambutol and rifampin.

Mycobacterium tuberculosis isolates cultured from 6 patients associated with an isoniazid-resistant M. tuberculosis outbreak acquired rifampicin resistance. The rpoB gene sequence showed that resistance was associated with rare mutations in each isolate. Three isolates had a mutation outside the rifampicin resistance-determining region.

BACKGROUND It is believed that the cessation of isoniazid's early bactericidal activity during the initial phase of antituberculosis therapy is due to the depletion of Mycobacterium tuberculosis in the exponential phase of growth. We examined the veracity of this cornerstone belief. METHODS We used an in vitro infection model in which M. tuberculosis was exposed to isoniazid concentration-tim...

BACKGROUND & OBJECTIVES Multidrug-resistant tuberculosis (MDR-TB) has emerged as a significant global health concern. The most important risk factor for the development of MDR-TB is previous anti-tuberculosis therapy. Category II pulmonary TB includes those patients who had failed previous TB treatment, relapsed after treatment, or defaulted during previous treatment. We carried out this study ...

The objective: to evaluate changes in detection frequency of Mycobacterium tuberculosis the main phylogenetic lines with various genetic determinants resistance rifampicin, isoniazid and fluoroquinolones 1998–2003 2016–2021. Subjects Methods. 965 mycobacterial cultures were studied, those isolated from pulmonary patients spoligotypes presence gene mutations associated isoniazid, determined. Res...

BACKGROUND The results of animal studies suggest that isoniazid-resistant strains of Mycobacterium tuberculosis are less pathogenic than isoniazid-susceptible strains. Here, we assess the relative pathogenicity of drug-resistant and drug-susceptible strains, in a human population. METHODS We linked IS6110 genotype patterns of M. tuberculosis strains with drug-susceptibility test results and e...

Corynebacterium ulcerans in an immuno-compromised patient with diphtheria and her dog. zoonotic transmission of toxigenic Cory-nebacterium ulcerans from companion animals in a human case of fatal diphtheria .acterization of toxigenic Corynebacterium ulcerans strains isolated from humans and domestic cats in the United Kingdom. Matrix-assisted laser desorption/ionisa-tion time-of-fl ight (MALDI-...

In order to study polymorphisms of the DNA insertion sequence 6110 (IS6110) in Mycobacterium tuberculosis strains isolated from Colombian patients, together with resistance to antituberculous medications in the Department of Quindío, Colombia, a prospective study was conducted using a consecutive sample of 59 patients with symptomatic pulmonary tuberculosis whose cases had been confirmed by bac...