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Free Content Mycobacterium tuberculosis Uganda genotype is the predominant cause of TB in Kampala, Uganda

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SETTING: Rubaga Division, Kampala, Uganda.

OBJECTIVE: To use polymerase chain reaction (PCR) based regions of difference (RD) analysis to study the species diversity of Mycobacterium tuberculosis complex isolates from a community-based sample of tuberculosis (TB) patients from Rubaga and to perform long sequence polymorphism (LSP) analysis to further characterise the M. tuberculosis Uganda genotype, a group of strains previously recognised by their characteristic spoligotype patterns.

DESIGN: For the present study, 344 consecutive TB patients attending clinics in Rubaga Division were enrolled. Sample processing and culture were performed at the National Tuberculosis and Reference Laboratory and molecular assays at Makerere Medical School. Species identification was achieved by determining the RDs, while spoligotyping and LSP analysis were performed to characterise the M. tuberculosis Uganda genotype.

RESULTS: Of the 344 isolates, 343 (99.7%) were M. tuberculosis sensu stricto, while one was classical M. bovis. The Uganda genotype strains characteristically lacked RD724, a locus that defines one of the major sub-lineages of M. tuberculosis, which suggested that this geographically constrained lineage is specifically adapted to a central African human host population.

CONCLUSION: M. tuberculosis is the most prevalent species of the M. tuberculosis complex in Kampala, and the Uganda genotype is the predominant strain.

Keywords: M. tuberculosis; Uganda genotype; species; sub-lineage

Document Type: Regular Paper

Affiliations: 1: Department of Medical Microbiology, Makerere University Medical School, Kampala, Uganda; Department of Microbiology, Tumour and Cell Biology, Karolinska Institutet, Stockholm, Sweden 2: Department of Bacteriology, Swedish Institute for Infectious Disease Control, Stockholm, Sweden 3: Clinical Microbiology Service and Department of Pathology, New York Presbyterian Hospital–Columbia University Medical Center, New York, New York, USA 4: Department of Medical Microbiology, Makerere University Medical School, Kampala, Uganda

Publication date: 2008-04-01

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

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