Covid-19 roundup: As­traZeneca, Pfiz­er come un­der fire for pro­duc­tion de­lays; Mod­er­na con­sid­ers third boost­er dose to squash new vari­ants

The vac­cine race is shap­ing up to be much more than just a sprint to­ward au­tho­riza­tion.

A day af­ter Mer­ck dropped out en­tire­ly, con­tro­ver­sies …

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