Peter C. Jentsch

A nurse at the Royal Free Hospital in London simulates the administration of the Pfizer vaccine on Dec. 4, 2020 to support staff training ahead of the rollout in the United Kingdom. (Yui Mok/Pool Photo via AP)

Which age group — old or young — should get the COVID‑19 vaccine first may depend on timing

If supplies of COVID-19 vaccine are initially limited, who should be vaccinated first? A mathematical model shows when and why it’s best to start with the young, and when older people should go first.

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