TY - JOUR T1 - How long are TB patients infectious? JF - Canadian Medical Association Journal JO - CMAJ SP - 157 LP - 157-b VL - 163 IS - 2 AU - D. Ahmad AU - W.K.C. Morgan Y1 - 2000/07/25 UR - http://www.cmaj.ca/content/163/2/157.3.abstract ER -