Health Omicron infection may enhance immunity against Delta variant, study suggests By - December 28, 2021 0 232 Facebook Twitter Pinterest WhatsApp Health By Staff Reuters Posted December 28, 2021 2:47 am 0:59COVID-19: Still to early to say whether Omicron variant is less severe than Delta, WHO says WATCH: COVID-19: Still to early to say whether Omicron variant is less severe than Delta, WHO says © 2021 Reuters Advertisement Advertisement
