Evolutionary analysis of a newly isolated Banna virus strain from Yunnan, China.

Banna virus (BAV) is a typical arbovirus whose infection is associated with fever and viral encephalitis. The whole genome of BAV is composed of 12 RNA segments. BAVs, which have been divided into three genotypes (A, B, and C) based on phylogenetic analysis of segment 12 or segment 9, are currently undergoing rapid evolution. Recent studies have shown that BAV variation can exceed intraspecific limits and generate novel viruses. In the current study, a new BAV strain, named 113c5, was isolated from Culex tritaeniorhynchus and found to be a member of genotype A2 based on phylogenetic analysis of segments 9 and 12. The complete genome sequence of the new BAV strain described in the current study might contribute to the surveillance of evolutionary characteristics of BAVs.