| impact of immigration on tuberculosis infection among canadian-born schoolchildren and young adults in montreal. | we conducted a cross-sectional tuberculin survey among non-bcg-vaccinated canadian-born schoolchildren in grades 6 and 10, health professional students, and young adult workers, to estimate the association of tuberculin reactions with indices of contact with tuberculosis. participants underwent simultaneous tuberculin testing with ppd-t (standard) and ppd-b (from m. intracellulare). exposure was estimated from questionnaire responses, group, aggregate census, and tuberculosis incidence data. of ... | 1997 | 9412575 |