New UK COVID-19 vaccine recommendations say 'it is reasonable' for people to mix and match different shots, even though there's not yet evidence that works

The UK has authorized two different coronavirus vaccines: one from Pfizer/BioNTech, and another from AstraZeneca/University of Oxford. Both require two doses, given several weeks apart.  The British government is suggesting that people could mix and match their two COVID-19 shots, if need be. There's a trial going on to see

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