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Phylogenetic trees of internal genes PB2 (2314 nt), PB1 (818 nt), P3 (2133 nt), P42 (1151 nt), NS (817 nt) and NP (1656 nt). Sequences are listed by host, country, strain name and collection year. Scale bars indicate nucleotide substitutions per site. The viruses analyzed in this study are in bold italic. The reassortant strain D/bovine/Italy/72875/2019 is marked by a green star. The groups Italy-D/OK and Italy-D/660 are highlighted in blue and purple, respectively.
