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COVID vaccines protect against Delta, but their effectiveness wanes
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doi: https://doi.org/10.1038/d41586-021-02261-8
References
Pouwels, K. B. et al. Preprint at Univ. Oxford https://www.ndm.ox.ac.uk/files/coronavirus/covid-19-infection-survey/finalfinalcombinedve20210816.pdf (2021).