Data Accessibility
All data supporting the findings of this study are openly accessible.
Genetic sequences from IAV surveillance in Iceland are deposited in
GenBank (https://www.ncbi.nlm.nih.gov/genbank) under accession
numbers listed in Supplementary table 1b. Raw data used for the analysis
are deposited in the Dryad Digital Repository
(https://doi.org/10.5061/dryad.m37pvmd2m).