Substitution on the HA protein.

Amino acid changes on the protein between A/equine/Lincolnshire/00620/2019 (UK/2019) and the vaccine strains commonly used: A/equine/South Africa/4/2003 (SA/2003) and A/equine/Richmond/1/2007 (UK/2007), and a more recent FC2 strain A/equine/Kent/2015 (UK/2015). Changes in antigenic sites, receptor binding domains (RBD) and changes in N-linked glycosylation sites are shown. Changes unique to UK/2019 are highlighted in bold. (XLSX)