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Updated: May 19, 2026
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Analysis of 18FDG PET/CT Imaging as a Tool for Studying Mycobacterium tuberculosis Infection and Treatment in Non-human Primates
Published on: September 5, 2017
Tuberculosis caused by RDRio Mycobacterium tuberculosis is not associated with differential clinical features.
C de B Barbosa1, L C O Lazzarini, A R Elias
1Multidisciplinary Research Laboratory, Clementino Fraga Filho University Hospital, Institute of Thoracic Diseases, Faculty of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
Summary
The Mycobacterium tuberculosis RD(Rio) genotype did not show distinct clinical features or increased severity in pulmonary tuberculosis patients. Further research is needed to understand tuberculosis (TB) clinical diversity.
Area of Science:
- Microbiology
- Infectious Diseases
- Genetics
Background:
- The Mycobacterium tuberculosis RD(Rio) genotype is a specific sublineage within the Latin American-Mediterranean (LAM) family.
- Genetic diversity in M. tuberculosis may influence tuberculosis (TB) clinical presentation, but prospective studies are limited.
Purpose of the Study:
- To investigate the association between the RD(Rio) M. tuberculosis genotype and distinct clinical features in pulmonary TB patients.
Main Methods:
- Clinical evaluation of 272 culture-proven pulmonary TB patients.
- Classification of M. tuberculosis isolates as RD(Rio) or non-RD(Rio) using multiplex PCR and spoligotyping.
- Analysis of clinical data alongside M. tuberculosis genotype information.
Main Results:
- RD(Rio) strains accounted for 26.5% of TB cases; the broader LAM genotype comprised 46.0%.
- No significant differences were observed in demographics, symptoms, radiographic findings, microbiological features, or clinical outcomes between RD(Rio) and non-RD(Rio) TB cases.
Conclusions:
- M. tuberculosis RD(Rio) strains do not appear to cause clinically distinctive or more severe TB in this patient cohort.
- Larger prospective studies are required to elucidate differential clinical characteristics associated with specific M. tuberculosis lineages.
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