Neutralisation of the SARS-CoV-2 Delta variant sub-lineages AY.4.2 and B.1.617.2 with the mutation E484K by Comirnaty (BNT162b2 mRNA) vaccine-elicited sera, Denmark, 1 to 26 November 2021 Lassaunière, Ria and Polacek, Charlotta and Fonager, Jannik and Bennedbæk, Marc and Boding, Lasse and Rasmussen, Morten and Fomsgaard, Anders, Eurosurveillance, 26, 2101059 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.49.2101059