Increased transmissibility and global spread of SARS-CoV-2 variants of concern as at June 2021

We present a global analysis of the spread of recently emerged SARS-CoV-2 variants and estimate changes in effective reproduction numbers at country-specific level using sequence data from GISAID.

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• 1 Nearly all investigated countries demonstrated rapid replacement of previously circulating lineages by the World Health Organization-designated variants of concern, with estimated transmissibility increases of 29% , 25% , 38% and 97% , respectively, for B.1.1.7, B.1.351, P.1 and B.1.617.2.

Understanding this could lead to better treatments, improved diagnostics, or a deeper grasp of how the human body works — benefiting patient care globally.

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