[Genetic Characteristics of the VP1 Region of the Coxsackie A16 Virus from Jiangsu Province, China, in 2015].

The aim of this study was to analyze the genetic characteristics of the VP1 gene of coxsackievirus A16(CA16)strains isolated from Jiangsu Province, China, in 2015.The VP1 regions of 20CA16 virus strains from Jiangsu Province in 2015 were amplified, and the amplification products were sequenced. Mega 6.0and DNA Star software were applied to build the phylogenetic tree and analyze the homogeneity of nucleotides and amino acids. The sequence homologies of the nucleotides and amino acids of the VP1 gene were 88.2%~100.0%and 98.0%~100.0%among 20CA16 isolates, respectively. Comparison with the sequence of the prototype strain A-G10 showed 75.3%~77.4% homologies in nucleotide sequence and90.6%~92.3%in amino-acid sequences, respectively. Comparison with the sequence of the representative strain B1 showed 88.3%~98.4% homologies in nucleotide sequence and 96.3%~100.0%in amino-acid sequence, respectively. Comparison with the sequence of the representative strain B2 showed 88.4%~90.8% homologies in nucleotide sequence and 96.6%~100.0%in amino-acid sequence, respectively. Twenty CA16 isolates were subgenotype B1.One isolate was subgenotype B1a, whereas the remainder of isolates was subgenotype B1b among 20 CA16 isolates. A subgenotype B1b transmission chain was also noted. The CA16 strains isolated from Jiangsu Province in 2015 belonged to subgenotype B1.There were two evolutionary branches, whereby B1 a and B1bwere co-circulating and evolving together. The epidemic strain was subgenotype B1b.