Florida Clade 1 dataset composition.

Distribution of sequences per year per region in the complete genome (CG) and HA-only datasets (only isolates from 2016 onward). For Europe, the number of sequences from the UK collected in 2019 included in the down sampled dataset is reported in a separated column. New sequences from the USA and the UK reported in this study are indicated in bold (included in the total number). (XLSX)