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Omicron’s Evolution and the New Bivalent COVID-19 Booster

Last month new “bivalent” booster vaccines made by Moderna and Pfizer became available that protect against currently circulating Omicron variants as well as earlier strains of the SARS-CoV-2 virus that causes COVID-19. This Q&A features Joel Ernst, MD, a UCSF professor of medicine whose research aims to understand how pathogens evade the immune system.

Regina Lai, pharmacy technician at UCSF, examines a dose of the Moderna COVID-19 vaccine