ABSTRACT
In spring 2021, an increasing number of infections was observed caused by the hitherto rarely described SARS-CoV-2 variant A.27 in south-west Germany. From December 2020 to June 2021 this lineage has been detected in 31 countries. Phylogeographic analyses of A.27 sequences obtained from national and international databases reveal a global spread of this lineage through multiple introductions from its inferred origin in Western Africa. Variant A.27 is characterized by a mutational pattern in the spike gene that includes the L18F, L452R and N501Y spike amino acid substitutions found in various variants of concern but lacks the globally dominant D614G. Neutralization assays demonstrated an escape of A.27 from convalescent and vaccine-elicited antibody-mediated immunity. Moreover, the therapeutic monoclonal antibody Bamlanivimab and partially the REGN-COV2 cocktail failed to block infection by A.27. Our data emphasize the need for continued global monitoring of novel lineages because of the independent evolution of new escape mutations.
ABSTRACT
SARS-CoV-2 variants of concern (VOC) and variants of interest (VOI) are heavily altering the COVID-19 pandemic’s course due to their increased transmissibility, virulence and immune escape abilities. Data on their spread in western sub-Saharan Africa is however still scarce. We therefore sequenced viral genomes from SARS-CoV-2 cases identified in central and northern Côte d’Ivoire between May 2020 and March 2021. We report the introduction of VOC B.1.1.7 as early as mid-January 2021, followed by detection of a single case of VOC B.1.351, as well as VOI B.1.525. Since early 2021 VOC/VOI are gradually dominating the SARS-CoV-2 virus pool in Côte d’Ivoire, as seen in other regions of the world. Intriguingly, we also find that another lineage, A.27, has also been on the rise over the same period. In sum, this study highlights again the extremely rapid local diffusion of VOC, VOI and possibly A.27, and the importance of further reinforcing capacities for genomic surveillance on the African continent.