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Free Content Prevalence of Beijing genotype in Latvian multidrug-resistant Mycobacterium tuberculosis isolates

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SETTING: Predominant genotypes of Mycobacterium tuberculosis include the Beijing family, which has caused large tuberculosis outbreaks and has been associated with increased virulence and multidrug resistance (MDR).

OBJECTIVE: To search for the Beijing genotype among Latvian MDR patients to characterise their DNA isolates at the molecular level.

DESIGN: MDR isolates were spoligotyped and tested for gene mutations by automatic nucleotide sequencing.

RESULTS: Of 109 isolates examined, 95 were located in six clusters of 2 to 63 isolates each. The 63 isolates in the largest cluster had an identical pattern corresponding to the Beijing genotype. The remaining isolates were of a non-Beijing genotype and formed another large group whose similarity ranged from 72% to 100%. Mutations in the rpoB and katG genes were compared in the Beijing and non-Beijing strains. In both groups, the rpoB gene mutations predominated in codons S531L (52.2%) and D516V (14.7%). Double mutations in the rpoB gene were observed in 8.2% of the isolates, most of them located among Beijing-type isolates. The katG gene mutation S315T (98.4%) was prevalent among all isolates.

CONCLUSION: Molecular analysis of MDR isolates of M. tuberculosis demonstrates that the Beijing genotype, most likely due to recent transmission, is prevalent in Latvia among MDR patients and that this genotype can be associated with double mutations.
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Keywords: DNA fingerprinting; drug resistance, multiple; genotype; mutation; tuberculosis

Document Type: Regular Paper

Affiliations: 1: Laboratory of Molecular Microbiology, Biomedical Research and Study Centre, University of Latvia, Riga, Latvia 2: Riga Stradins University, Riga, Latvia 3: International Reference Laboratory of Mycobacteriology, Statens Serum Institut, Copenhagen, Denmark

Publication date: November 1, 2003

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  • The International Journal of Tuberculosis and Lung Disease (IJTLD) is for clinical research and epidemiological studies on lung health, including articles on TB, TB-HIV and respiratory diseases such as COVID-19, asthma, COPD, child lung health and the hazards of tobacco and air pollution. Individuals and institutes can subscribe to the IJTLD online or in print – simply email us at [email protected] for details.

    The IJTLD is dedicated to understanding lung disease and to the dissemination of knowledge leading to better lung health. To allow us to share scientific research as rapidly as possible, the IJTLD is fast-tracking the publication of certain articles as preprints prior to their publication. Read fast-track articles.

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