Covid-19 roundup: Pfiz­er, BioN­Tech study sug­gest vac­cine works against vari­ants; Re­searchers say Sino­vac's vac­cine is 78% ef­fec­tive

Amid height­ened con­cerns about new, large­ly un­known vari­ants of SARS-CoV-2 that ap­pear to spread more rapid­ly, Pfiz­er and BioN­Tech say they have pre­lim­i­nary ev­i­dence that …

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