Spread of the Delta variant, vaccine effectiveness against PCR-detected infections and within-host viral load dynamics in the community in France
2021
Blanquart, François | Abad, Clémence | Ambroise, Joevin | Bernard, Mathieu | Cosentino, Gina | Giannoli, Jean-Marc | Débarre, Florence
We use a large number of SARS-CoV-2 PCR tests in the community in France from 15th May 2021 to 7th July 2021 and infer 76% vaccine effectiveness against PCR detected infection, similar effectiveness against Delta and previous variants, a +67% to +217% transmission advantage for Delta depending on the region, and a larger viral load at symptom onset (-2.4 Ct) for Delta variant infections.
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