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The summary below is from the full report titled “Hospital Ventilation and Risk for Tuberculous Infection in Canadian Health Care Workers.” It is in the 21 November 2000 issue of Annals of Internal Medicine (volume 133, pages 779-789). The authors are D Menzies, A Fanning, L Yuan, JM FitzGerald, and the Canadian Collaborative Group in Nosocomial Transmission of TB.