Abstract:Background. Since the beginning of the COVID-19 pandemic, several SARS-CoV-2 variants have sequentially emerged. In France, most cases were due to spike D641G-harbouring viruses that descended initially from the Wuhan strain, then by variant of B.1.160 lineage we called Marseille-4 since the summer of 2020, which was followed by the alpha (UK) and beta (South African) variants in early 2021, then delta (Indian) now.Methods and Findings. We determined the neutralizing antibody (nAb) titres in sera from convales… Show more
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