Covid-19 roundup: South African vari­ant trips up Pfiz­er/BioN­Tech, Mod­er­na vac­cines while EU seeks an­ti-vari­ant con­tract claus­es — re­port

As ques­tions con­tin­ue to swirl about the ef­fec­tive­ness of cur­rent vac­cines against new vari­ants of the coro­n­avirus, a pair of let­ters to the ed­i­tor con­firm …

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