Delay the Second Covid Vaccine Shot? What Experts Say

As countries contend with limited supplies of Covid-19 vaccine, governments are grappling with whether to prioritize getting a first shot into as many arms as possible, or to take a slower approach that reserves some vials to deliver a second dose at the interval prescribed for attaining maximum protection. The U.K. has adopted the approach, calculating that vaccinating twice as many people is preferable to vaccinating half as many in the same time even if a smaller group’s protection would be s

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