AstraZeneca (AZN) COVID-19 Booster Dose Useful Against Omicron Posted byZacks Equity Research January 14, 2022 Leave a comment on AstraZeneca (AZN) COVID-19 Booster Dose Useful Against Omicron Data from multiple studies support the use of AstraZeneca’s (AZN) COVID vaccine booster against several variants of concern, including Omicron.