NewsThailandUpdate COVID-19 Covid-19 vaccine efficacy against variants By Pattaya Mail April 8, 2021 0 3951 Share on Facebook Tweet on Twitter tweet infographics. Source: UW Medicine; Reuters; Lancet; Lancet Preprint; Biorxiv; Moderna; Nature; New England Joural of Medicine; Imperial College London; CDC; CoV-lineages.org, Business Insider (NNT)