Canadian Respiratory Journal

Canadian Respiratory Journal / 2002 / Article

Original Article | Open Access

Volume 9 |Article ID 202870 |

R Kevin Elwood, Anabelle M Opazo Saez, Vittorio Lentini, Ramak Shadmani, "Incidence of Pulmonary Disease Caused by Mycobacteria other than Tuberculosis in British Columbia", Canadian Respiratory Journal, vol. 9, Article ID 202870, 5 pages, 2002.

Incidence of Pulmonary Disease Caused by Mycobacteria other than Tuberculosis in British Columbia


CONTEXT: The incidence of pulmonary disease due to mycobacteria other than tuberculosis (TB) in Canada has not been documented.OBJECTIVE: To determine the incidence of pulmonary disease due to mycobacteria in the nonimmunocompromised population of British Columbia.DESIGN: A retrospective cohort study of 110 cases of mycobacteria infection other than TB identified from 1991 to 1995.SETTING: British Columbia Centre for Disease Control, Division of TB Control.RESULTS: The overall incidence rate of infection with mycobacteria other than TB was 0.63×10-5/year. This incidence rate was significantly higher among women (relative risk [RR]=2, P=0.0006) and in those aged 55 years or older (RR=8, P<0.00001). In contrast with TB, patients were more frequently born in Canada (P<0.00001) or in industrialized countries other than Canada (P<0.00001), and were less likely to be Aboriginal (P=0.0007) or foreign born from Asia (P<0.0001). The most common organism isolated in British Columbia was Mycobacterium avium-intracellulare (82.7%). Overall, 78 (71%) cases had underlying lung disease. Drug intolerance was very common (42%). After treatment, 55% and 41% of the patients were rendered smear negative or culture negative, respectively. Radiological improvement was noted in 55% of patients, and 60% of patients responded symptomatically to treatment.CONCLUSIONS: The overall incidence of pulmonary disease is low. It is a disease predominantly of women 55 years and older, and targets completely different ethnic groups than TB, suggesting a protective effect of infection with Mycobacterium tuberculosis. M avium-intracellulare was the most common pathogen isolated. Further investigation is required into the natural history of so-called 'colonizers'. Considerable morbidity may be prevented with earlier intervention.

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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