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. 2021 Mar 27;100(7):101169. doi: 10.1016/j.psj.2021.101169

Figure 2.

Figure 2

Phylogenetic tree of 139 isolates and 22 reference strains for S1 genes of IBV (starting at the AUG translation initiation codon and ending at the cleavage recognition motifs). A) Phylogenetic tree of S1 gene of isolates from April 2019 to March 2020 (Traditional). B) Phylogenetic tree of S1 gene of isolates in from April 2019 to March 2020 (Circle). The phylogenetic tree was constructed using the MEGA version 5.0 by the neighbor joining method with No. of differences model and setting bootstrap 1,000 replicates. The reference strains are marked with ▲. Seven variant strains that were marked with ●. Unmarked strains are field strains isolated in this study.