title: Reply to El Sahly.
authors.affiliation: McGill International Tuberculosis Centre and Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada Division of Infectious Disease, Beth Israel Deaconess Medical Centre, Boston, Massachusetts.
authors.forename: Claudia M
authors.initials: CM
authors.lastname: Denkinger
authors.affiliation: McGill International Tuberculosis Centre and Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada Respiratory Epidemiology and Clinical Research Unit, Montreal Chest Institute, Montreal, Canada.
authors.forename: Madhukar
authors.initials: M
authors.lastname: Pai
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D014376:Tuberculosis / Q000175:diagnosis*