J&J pro­pos­es slid­ing boost­er time­lines as FDA ques­tions lack of da­ta for Delta, old­er adults be­fore ad­comm

While both Pfiz­er/BioN­Tech and Mod­er­na are look­ing to ad­min­is­ter boost­ers for their Covid-19 vac­cines six months af­ter the ini­tial two-dose se­ries, J&J — which has vac­ci­nat­ed …

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