In addition to the virus sequences obtained from foxes and wild birds in the Netherlands in this study, the top five BLAST results for related sequences in Eurasia were included in the phylogenetic analysis. These H5N1 genome sequences were downloaded from the GISAID database (26 (link)). A phylogenetic analysis of the complete genome sequences was performed for each genome segment separately, aligning the virus sequences using MAFFT v7.475 (27 (link)) and reconstructing the phylogeny using a maximum likelihood (ML) analysis with IQ-TREE software v2.0.3 and 1,000 bootstrap replicates (28 (link)). The ML tree was visualized using the R package ggtree (29 (link)). The GISAID sequences used in the phylogenetic analysis are listed in Table S5, in which we acknowledge all of the contributors to the GISAID database.
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