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Abstract

The Delta variant has become the dominant strain of SARS-CoV-2. We summarised the evidence on COVID-19 vaccine effectiveness (VE) identified in 17 studies that investigated VE against different endpoints. Pooled VE was 63.1% (95% confidence interval (CI): 40.9–76.9) against asymptomatic infection, 75.7% (95% CI: 69.3–80.8) against symptomatic infection and 90.9% (95% CI: 84.5–94.7) against hospitalisation. Compared with the Alpha variant, VE against mild outcomes was reduced by 10–20%, but fully maintained against severe COVID-19.

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/content/10.2807/1560-7917.ES.2021.26.41.2100920
2021-10-14
2021-12-01
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2021.26.41.2100920
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/content/10.2807/1560-7917.ES.2021.26.41.2100920
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