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Phylogenetic tree of MLB-AstVs strains obtained using a 645-nt fragment at the 3′ end of ORF1b. Strains detected from influent samples (marked ●) along with corresponding historical AstV strains, including VA-AstVs and other animal AstVs strains, are included. Bootstrap values greater than 700 among 1,000 replicates are shown on each branch.
