[Epidemiological study of a tuberculosis case in a large manufacturing enterprise in Quebec].
OBJECTIVE
To determine the prevalence of tuberculosis infection related to a case of pulmonary and laryngeal tuberculosis in a workplace and to study PPD predictors.


METHODS
The Mantoux skin test (PPD) was offered to all potentially infected contacts. Participants were asked to answer a questionnaire.


RESULTS
Among 112 exposed employees, 92 (82.1%) were tested. At the 5 mm level, 65.2% of employees had positive tuberculin skin test (PPD). By controlling prior BCG and the degree of exposure, it showed a positive association between age and PPD (RC: 3.5; 95% CI: 1.25-10.03). When age and BCG were controlled, high exposure was statistically associated with PPD results (RC: 5.6; 95% CI: 1.25-24.68).


CONCLUSIONS
The observed prevalence rate is probably related to the fact that the index case was very infectious and had contact in an enclosed area over a long period of time before withdrawal from work.
Régie régionale de la santé, Centre-du-Québec. marie.josee.drolet@msss.gouv.qc.ca
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Drolet
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Boisvert
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Déry
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Laliberté
D000328:Adult; D017677:Age Distribution; D016021:Epidemiologic Studies; D006801:Humans; D007221:Industry; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000175:diagnosis / Q000453:epidemiology*; D015995:Prevalence; D011792:Quebec / Q000453:epidemiology; D011795:Surveys and Questionnaires; D014374:Tuberculin Test; D014387:Tuberculosis, Laryngeal / Q000175:diagnosis / Q000453:epidemiology* / Q000635:transmission*; D014397:Tuberculosis, Pulmonary / Q000175:diagnosis / Q000453:epidemiology* / Q000635:transmission*
Enquête épidémiologique sur un cas de tuberculose dans une grande entreprise manufacturière québécoise.