A health care worker prepares COVID-19 vaccine doses at the Portland Veterans Affairs Medical Center on Wednesday in Portland, Ore. Hospitals across the U.S. began getting their first doses of Pfizer's vaccine this week.
Nathan Howard/Getty Images
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Atlantic writer Ed Yong says the COVID-19 vaccination program will be the most complicated the U.S. has ever attempted: "It's going to be a slow process, and there are a lot of possible roadblocks."
A health care worker prepares COVID-19 vaccine doses at the Portland Veterans Affairs Medical Center on Wednesday in Portland, Ore. Hospitals across the U.S. began getting their first doses of Pfizer's vaccine this week.
Nathan Howard/Getty Images
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