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(a–d) Phylogenetic trees of partial the VP4 gene. Trees were built using MEGA6 software with the maximum-likelihood method; bootstrap values (1000 replicates) of ⩾70% are shown at the branch nodes. The regional genotypes are highlighted in bold next to a solid circle (•): (a) P[8], (b) P[7], (c) P[13], (d) P[23].
