Vaccine effectiveness against infection with the Delta (B.1.617.2) variant, Norway, April to August 2021 Seppälä, Elina and Veneti, Lamprini and Starrfelt , Jostein and Danielsen, Anders Skyrud and Bragstad, Karoline and Hungnes, Olav and Taxt, Arne Michael and Watle, Sara Viksmoen and Meijerink, Hinta, Eurosurveillance, 26, 2100793 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.35.2100793