World AstraZeneca says it is working on an Omicron vaccine with Oxford By - December 22, 2021 0 232 Facebook Twitter Pinterest WhatsApp World By Maria Ponnezhath Reuters Posted December 21, 2021 7:50 pm 5:01Slowing down the spread of Omicron with boosters WATCH: Slowing down the spread of Omicron with boosters © 2021 Reuters Advertisement Advertisement