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

Finlay Campbell ; Brett Archer ; Henry Laurenson-Schafer ; Yuka Jinnai ; Franck Konings ; Neale Batra ; Boris Pavlin ; Katelijn Vandemaele ; Maria D Van Kerkhove ; Thibaut Jombart ORCID logo ; +2 more... Oliver Morgan ; Olivier le Polain de Waroux ORCID logo ; (2021) Increased transmissibility and global spread of SARS-CoV-2 variants of concern as at June 2021. Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin, 26 (24). pp. 1-6. ISSN 1025-496X DOI: 10.2807/1560-7917.ES.2021.26.24.2100509
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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. 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% (95% CI: 24-33), 25% (95% CI: 20-30), 38% (95% CI: 29-48) and 97% (95% CI: 76-117), respectively, for B.1.1.7, B.1.351, P.1 and B.1.617.2.


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