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Neighbor joining phylogenetic trees of HA and NA of the detected H9N2 viruses in Egypt. The phylogenetic analysis was performed using MEGA version 7, and the evolutionary distances were computed using the Kimura 2-parameter method. H9N2 viruses sequenced specifically for this study are labeled with colored circles (2017 black, 2018 red, 2019 green, 2020 blue, and 2021 gray).
