Group A human rotaviruses(RVAs)annually cause the deaths of 215,000 infants and young children.To understand the epidemiological characteristics and genetic evolution of RVAs,we performed sentinel surveillance on RVA ...Group A human rotaviruses(RVAs)annually cause the deaths of 215,000 infants and young children.To understand the epidemiological characteristics and genetic evolution of RVAs,we performed sentinel surveillance on RVA prevalence in a rotavirus-surveillance network in Hubei,China.From 2013 to 2016,a total of 2007 fecal samples from hospital outpatients with acute gastroenteritis were collected from four cities of Hubei Province.Of the 2007 samples,153(7.62%)were identified positive for RVA by real-time RT-PCR.RVA infection in Hubei mainly occurred in autumn and winter.The highest detection rate of RVA infection was in 1–2 years old of outpatients(16.97%).No significant difference of RVA positive rate was observed between females and males.We performed a phylogenetic analysis of the G/P genotypes based on the partial VP7/VP4 gene sequences of RVAs.G9P[8]was the most predominant strain in all four years but the prevalence of G2P[4]genotype increased rapidly since 2014.We reconstructed the evolutionary time scale of RVAs in Hubei,and found that the evolutionary rates of the G9,G2,P[8],and P[4]genotypes of RVA were 1.069×10^(-3),1.029×10^(-3),1.283×10^(-3)and 1.172×10^(-3)nucleotide substitutions/site/year,respectively.Importantly,using a molecular clock model,we showed that most G9,G2,P[8],and P[4]genotype strains dated from the recent ancestor in 2005,2005,1993,and 2013,respectively.The finding of the distribution of RVAs in infants and young children in Hubei Province will contribute to the understanding of the epidemiological characteristics and genetic evolution of RVAs in China.展开更多
基金the National Natural Science Foundation of China(Grant Numbers 31770833 and 32071212)the Natural Science Foundation of Hubei Province(Grant Number 2018CFB716)+1 种基金the Health and Family Planning Scientific Research Project of Hubei Province(Grant Number WJ2017M137)the China Postdoctoral Science Foundation(Grant Numbers 2021TQ0252 and 2021M700103)。
文摘Group A human rotaviruses(RVAs)annually cause the deaths of 215,000 infants and young children.To understand the epidemiological characteristics and genetic evolution of RVAs,we performed sentinel surveillance on RVA prevalence in a rotavirus-surveillance network in Hubei,China.From 2013 to 2016,a total of 2007 fecal samples from hospital outpatients with acute gastroenteritis were collected from four cities of Hubei Province.Of the 2007 samples,153(7.62%)were identified positive for RVA by real-time RT-PCR.RVA infection in Hubei mainly occurred in autumn and winter.The highest detection rate of RVA infection was in 1–2 years old of outpatients(16.97%).No significant difference of RVA positive rate was observed between females and males.We performed a phylogenetic analysis of the G/P genotypes based on the partial VP7/VP4 gene sequences of RVAs.G9P[8]was the most predominant strain in all four years but the prevalence of G2P[4]genotype increased rapidly since 2014.We reconstructed the evolutionary time scale of RVAs in Hubei,and found that the evolutionary rates of the G9,G2,P[8],and P[4]genotypes of RVA were 1.069×10^(-3),1.029×10^(-3),1.283×10^(-3)and 1.172×10^(-3)nucleotide substitutions/site/year,respectively.Importantly,using a molecular clock model,we showed that most G9,G2,P[8],and P[4]genotype strains dated from the recent ancestor in 2005,2005,1993,and 2013,respectively.The finding of the distribution of RVAs in infants and young children in Hubei Province will contribute to the understanding of the epidemiological characteristics and genetic evolution of RVAs in China.
