The cu­ri­ous im­munol­o­gy be­hind the UK's sur­prise As­traZeneca dos­ing plan

As ex­pect­ed, UK reg­u­la­tors au­tho­rized As­traZeneca’s Covid-19 vac­cine on Wednes­day. What was less ex­pect­ed were the in­struc­tions au­thor­i­ties gave when OK­ing it: Peo­ple could re­ceive …

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