Covid-19 roundup: CDC study shows good pro­tec­tion from mR­NA boost­er plus J&J's sin­gle-dose vac­cine; White House launch­es test-to-treat Paxlovid site

Con­cerns about rare but life-threat­en­ing blood clots have lim­it­ed the use of J&J’s Covid-19 vac­cine — once pitched as the on­ly one-shot op­tion in the mix — with the FDA cut­ting it off ex­cept in lim­it­ed cir­cum­stances. Yet there’s some good news for those who did re­ceive it: A sin­gle boost­er dose of an mR­NA vac­cine for re­cip­i­ents of a sin­gle prim­ing dose of Ad26.COV2.S (the J&J vac­cine) pro­vid­ed pro­tec­tion close to that of a three-dose mR­NA vac­cine reg­i­men.

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