RT Journal Article SR Electronic T1 SARS-CoV-2 infection in a 76-year-old man with initially negative nasopharyngeal swabs JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E546 OP E549 DO 10.1503/cmaj.200641 VO 192 IS 20 A1 Divjot S. Kumar A1 Siobhán B. O’Neill A1 James C. Johnston A1 Jennifer M. Grant A1 David D. Sweet YR 2020 UL http://www.cmaj.ca/content/192/20/E546.abstract