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''1 of Arequipa viruses (A/SA sea lion/PeruAQP-SER00R/2023) w/ D701N #mutation clusters on #PB2 tree with #H5N1 isolated from a #human in #Chile a few wks later (3 24, 23) that also has D701N, but this pattern does not hold for trees inferred using other genome segments... these data provide #evidence that D701N is emerging repeatedly in H5N1 viruses that infect mammalian hosts along S America’s Pacific coast... these data cannot yet ascertain if viruses ... are transmitting within mammals.''