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Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant – nejm.org

Original Article from The New England Journal of Medicine — Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta)…

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Study Design
We used two approaches to estimate the effect of vaccination on the delta variant. First, we used a test-negative casecontrol design to estimate vaccine effectiveness against symptomatic disease caused by the delta variant, as compared with…

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