Relationship of the Tanzanian ANV and CAstV strains (highlighted in bold red font) with other AAstVs based on the complete capsid protein (CP) aa sequences. The mean genetic distances and standard deviation (±) are indicated in brackets for each group. Details of the taxa in the condensed subtrees are shown in Figure S1. The final data set involved 147 sequences and a total of 577 positions. Genogroups are named as explained in the text. Sequence names include GenBank accession numbers, abbreviated host avian species, and country/strain/strain/year of isolation. Abbreviations: AAstV, Avastrovirus; ANV, avian nephritis virus; CAstV, chicken astrovirus; DAstV, duck astrovirus; GfAstV, guinea fowl astrovirus; GoAstV, goose astrovirus; TAstV, turkey astrovirus.