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Free Content Transmission characteristics of tuberculosis in the foreign-born and the Canadian-born populations of Alberta, Canada

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SETTING: All notified cases of tuberculosis in the province of Alberta, Canada, 1994–1998.

OBJECTIVE: To compare the transmission characteristics of tuberculosis among foreign-born and Canadian-born cases.

DESIGN: Retrospective analysis using DNA fingerprinting (IS6110 restriction fragment length polymorphism and spoligotyping) and patient information from the Alberta Tuberculosis Registry. Transmission indexes were determined by calculating the average number of culture-positive pulmonary cases generated by a single source case.

RESULTS: Of the 750 cases of active tuberculosis, 437 (58.3%) were in the foreign-born. DNA fingerprinting of Mycobacterium tuberculosis isolates from all 573 culture-positive cases over the 5 years from 1994 to 1998 showed that there was significantly less clustering among foreign-born isolates (9.8%) compared to Canadian-born non-Aboriginal (28.8%) and Aboriginal (44.7%) isolates. The transmission index was significantly higher for males, lower for those ≥65 years of age, and higher for Aboriginals.

CONCLUSION: Although cases of tuberculosis in the foreign-born constitute the majority in Alberta, there is little transmission to other foreign-born or to Canadian-born individuals. Transmission of tuberculosis among the Aboriginal population remains a significant problem in Alberta.
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Keywords: aboriginal; foreign-born; transmission; tuberculosis

Document Type: Regular Paper

Affiliations: 1: Department of Medicine, University of Alberta, Edmonton, Alberta, Canada 2: Department of Medicine and Community Health Science, University of Manitoba, Winnipeg, Manitoba, Canada 3: Provincial Laboratory of Public Health, Edmonton, Alberta, Canada

Publication date: 01 October 2004

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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.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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