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The aims of the present study were to investigate the genetic characteristics of enterovirus 71 (EV71) and coxsackievirus A16 (CVA16) strains in China and to evaluate the relationship between the genotypes of CVA16 and EV71 and their geographical distribution. A total of 399 stool specimens were collected from children with symptoms of hand, foot and mouth disease (HFMD) in Zhejiang Province. The presence of enteroviruses was determined using reverse transcription-semi-nested PCR targeted to the VP1 gene of all human enteroviruses and DNA sequencing. EV71 and CVA16, the major etiological agents of HFMD, were detected in 38.4% (38/99) and 35.4% (35/99) of HEV-A species-positive cases, respectively. Based on the phylogenetic analysis of the VP1 gene, EV71 strains identified in this study belong to subgenotype C4, and CVA16 strains herein were classified into clusters B2a and B2b within the genotype B2. Taking into consideration other published data, we conclude that the genetic characteristics of enteroviruses in China reflect the pattern of the endemic circulation of the subgenotype C4 to EV71 and clusters B2a and B2b within genotype B2 to CVA16, which have been continuously circulating in China since 1997. This observation indicates that the genetic characteristics of enteroviruses in China seem to depend on their special geographical and climatical features allowing them to be sustained with little external effect.

Detection of human enterovirus 71 and coxsackievirus A16 in children with hand, foot and mouth disease in China