Moderna, Inc. reported on 5 May that both a third shot of its messenger RNA vaccine mRNA-1273 and a single injection of its strain-matched booster candidate mRNA-1273.351 were effective against SARS-CoV-2 and two variants of the novel coronavirus – B.1.351 and P.1, first identified in South Africa and Brazil, respectively.
Booster shots were given in a Phase II study to people previously vaccinated with two doses of mRNA-1273 and increased...







