Covid-19 roundup: New study sug­gests Mod­er­na vac­cine may be more ef­fec­tive than Pfiz­er against the Delta vari­ant; Pen­ta­gon to re­quire vac­cines for mem­bers of the mil­i­tary 

A study of pa­tients in the Mayo Clin­ic Health Sys­tem across mul­ti­ple states sug­gests those who re­ceived Pfiz­er’s Covid-19 vac­cine are at a two-fold high­er …

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