Nature Portfolio. (2021, October 15). A study in @NatureMedicine indicates that the effectiveness of the Pfizer/BioNTech and Oxford-AstraZeneca vaccines against SARS-CoV-2 infections with symptoms or high viral burden is reduced with the Delta variant compared to the Alpha variant. Https://go.nature.com/3vecpoj https://t.co/XQdnMYguFz [Tweet]. @NaturePortfolio. https://twitter.com/NaturePortfolio/status/1449145321188216836

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