scholarly journals Diversity of Mycobacterium tuberculosis Complex Lineages Associated with Pulmonary Tuberculosis in Southwestern, Uganda

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Lisa Nkatha Micheni ◽  
Kennedy Kassaza ◽  
Hellen Kinyi ◽  
Ibrahim Ntulume ◽  
Joel Bazira
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Pulmonary Tuberculosis ◽  
Mycobacterium Tuberculosis Complex ◽  
Genotypic Diversity ◽  
Hiv Incidence ◽  
Nucleotide Polymorphism ◽  
Tuberculosis Complex ◽  
Single Nucleotide ◽  
The World ◽  
Southwestern Uganda

Uganda is among the 22 countries in the world with a high burden of tuberculosis. The southwestern region of the country has consistently registered a high TB/HIV incidence rate. This study is aimed at characterizing the Mycobacterium tuberculosis complex (MTBC) genotypic diversity in southwestern Uganda. A total of 283 sputum samples from patients with pulmonary tuberculosis were genotyped using specific single nucleotide polymorphism markers for lineages 3 and 4. Most of the patients were males with a mean age of 34. The lineage 4 Ugandan family was found to be the most dominant strains accounting for 59.7% of all cases followed by lineage 3 at 15.2%. The lineage 4 non-Ugandan family accounted for 14.5% of all cases while 4.2% showed amplification for both lineage 4 and lineage 3. Eighteen samples (6.4%) of the strains remained unclassified since they could not be matched to any lineage based on the genotyping technique used. This study demonstrates that a wide diversity of strains is causing pulmonary tuberculosis in this region with those belonging to the lineage 4 Ugandan family being more predominant. However, to confirm this, further studies using more discriminative genotyping methods are necessary.

scholarly journals 1633. Improving the diagnosis of extra-pulmonary tuberculosis (EPTB): experience from north India

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S808-S808
Author(s):  
Anchal Sharma ◽  
Kusum Sharma ◽  
Manish Modi ◽  
Aman Sharma
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Pulmonary Tuberculosis ◽  
Mycobacterium Tuberculosis Complex ◽  
Lamp Assay ◽  
Nucleic Acid Amplification ◽  
Rural Setting ◽  
Tuberculosis Complex ◽  
Extra Pulmonary Tuberculosis ◽  
Resource Poor ◽  
Extra Pulmonary

Abstract Background Rapid and accurate diagnosis of extra-pulmonary tuberculosis (EPTB) is imperative for early treatment and better patient outcome. Loop-mediated Isothermal Amplification (LAMP) is a promising nucleic-acid amplification assay. LAMP assay could be carried out in simple water bath under isothermal conditions in 60 minutes, and can be performed in any laboratory even in rural setting in resource poor endemic countries. We evaluated LAMP assay using two different target regions LAMP primers specific for Mycobacterium tuberculosis complex for the diagnosis of EPTB. Methods LAMP assay using 6 primers (each for IS6110 and IS1081) specific for Mycobacterium tuberculosis complex were performed on patients suspected of EPTB on various EPTB samples(CSF, Synovial fluid, Lymaphnode and tissue biopsies and various other samples) of 150 patients (50 confirmed, 100 suspected) Clinically suspected of EPTB and 100 non-TB control subjects. Results Overall LAMP test (using any of the two targets) had sensitivity and specificity of 96% and 100% for confirmed (50 culture positive) EPTB cases. In 100 clinically suspected but unconfirmed EPTB cases, LAMP was positive in 87 out of 100 cases (87%). Sensitivity of IS6110 LAMP, 1S1081 LAMP and IS6110 PCR for clinically suspected cases was 78 (78%), 84 (84%) and 70 (70%), respectively. In total 150 EPTB patients, the overall sensitivity of microscopy, culture, IS6110 PCR, IS6110 LAMP, 1081 LAMP and the LAMP test (if any of the two targets were used) were 4%, 33.3%, 74.6%, 82.66%, 87% and 92%, respectively. Specificity of all the tests was 100%. There were 8 cases which were missed by IS6110 LAMP and 2 cases by 1081 LAMP. Conclusion LAMP assay using two targets is a promising technique for rapid diagnosis of EPTB in 60 minutes especially in a resource poor setting who are still battling with this deadly disease. Disclosures All Authors: No reported disclosures

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