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Katherine Ambrose, RN and medical reserve corps member, looks on as Army medic Jenny Rafailov, left, fills a syringe at the COVID vaccination site at Cal Expo in Sacramento on Jan. 21, 2021. Photo by Anne Wernikoff, CalMatters
Vials of the Pfizer-BioNTech COVID-19 vaccine are removed from cold storage to be thawed for use on Dec. 15, 2020 at UC Davis Health. Photo courtesy of UC Davis Health

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