RT Journal Article SR Electronic T1 Atteinte et maintien de l’immunité collective contre le SRAS-CoV-2 JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1279 OP E1280 DO 10.1503/cmaj.210892-f VO 193 IS 32 A1 Shelly Bolotin A1 Sarah Wilson A1 Michelle Murti YR 2021 UL http://www.cmaj.ca/content/193/32/E1279.abstract