Covid-19 vaccines: Is it okay to get a leftover jab?
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At the moment, vaccines against the coronavirus are a finite resource.
Production of the few vaccines that have been approved by regulators is limited, with demand outstripping supply.
Meanwhile, almost all of the lowest-income countries – in Africa and elsewhere – have not even started giving vaccinations.
With coronavirus-linked deaths surpassing two million globally last week, the stakes of giving vaccinations to those that need them most could not be higher.
In most countries, health workers and the elderly are first in line, with few exceptions.
But there are some circumstances in which vaccine doses are available to young, less vulnerable people, regardless of their need.