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A medical worker holding a Pfizer-BioNTech vaccine and a syringe during mass vaccination starts in Vienna, Austria, Friday, Jan. 15, 2021. Authorities started to vaccinate the most vulnerable people in a coordinated effort. (AP Photo/Ronald Zak)

A medical worker holding a Pfizer-BioNTech vaccine and a syringe during mass vaccination starts in Vienna, Austria, Friday, Jan. 15, 2021. Authorities started to vaccinate the most vulnerable people in a coordinated effort. (AP Photo/Ronald Zak)

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