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• W3012946543 abstract "Objective: To understand the genetic variation and epidemiological characteristics of human respiratory syncytial virus (HRSV) in Guangzhou. Methods: Nasopharyngeal swabs specimens were collected from 0-6 year old children hospitalized with acute respiratory infection, then HRSV was tested and genotyped by RT-PCR. Phylogenetic tree was bulit using MEGA 6.0 software. NetNGlyc 1.0 server was used to predict the potential N-linked glycosylation sites. Results: A total of 1 225 nasopharyngeal specimens were collected, including 783 males and 442 females. The median (P(25), P(75)) age was 8 (3, 24) months. Among the 209 HRSV-positive cases (17.06%), 117 cases (55.98%) were HRSV-A and 92 cases (44.02%) were HRSV-B. The two distinct subgroups (HRSV-A and HRSV-B) alternately played dominant role to cause HRSV infection and exchange almost once every two years. The HRSV prevalence rate decreased with age. The HRSV-positive rate among children under 2 years old was 18.83% (196 cases), accounting for 93.78% of the total positive cases. There were 32 HRSV positive cases co-infected with at least one respiratory virus, with the co-infection rate of 15.31%. Phylogenetic tree analysis of the second hypervariable region (HVR2) of the G protein classified the HRSV-A specimens into ON1 (n=62) and NA1 (n=2) genotypes while all HRSV-B specimens belonged to BA genotype (n=53). The HVR2 of the G protein varied in using stop condon, amino acid substitutions, glycosylation sites. Conclusion: Children under 2 years old were the high risk population of HRSV infection in Guangzhou. ON1 genotype turned into a primary genetype of the HRSV-A subgroup while BA genotype dominated the HRSV-B subgroup. A greater diversification of amino acid substitutions, and some deletion and insertion of glycosylation sites embodied the polymorphism of G protein as main protective antigen.目的： 分析广州人呼吸道合胞病毒（HRSV）的流行特征及遗传变异特征。 方法： 2013—2017年在广州两家哨点医院（广东省妇幼保健院和中山大学孙逸仙纪念医院）采集0~6岁急性呼吸道感染住院儿童的鼻咽拭子作为标本。采用逆转录PCR和巢式PCR方法进行HRSV的检测和分型，通过MEGA 6.0、NetNGlyc 1.0等软件对HRSV序列进行基因亲缘性分析以及N-糖基化位点的预测。 结果： 共收集鼻咽试子标本1 225份，其中男性783份，女性442份；月龄M（P(25)，P(75)）为8（3，24）月。共检出HRSV儿童感染者209例（17.06%），其中HRSV-A为117例（55.98%），HRSV-B为92例（44.02%）。2岁以下儿童HRSV检出率为18.83%（196例），占总阳性标本的93.78%。209例检出HRSV儿童中，32例（15.31%）还感染了至少1种其他呼吸道病毒。进化树分析显示，62株HRSV-A属于ON1基因型，2株属于NA1基因型，53株HRSV-B全部属于BA基因型。G蛋白的第二高变区在氨基酸替换，终止密码子的使用以及糖基化位点方面均具有多态性。 结论： 广州2岁以下儿童是感染HRSV的高发人群，ON1为HRSV-A主导基因型，BA为HRSV-B的主导基因型。多样化的氨基酸替换，某些糖基化位点的缺失与插入，体现了G蛋白作为主要保护性抗原的多样性。." @default.
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• W3012946543 date "2020-03-06" @default.
• W3012946543 modified "2023-09-23" @default.
• W3012946543 title "[Epidemiology and molecular biology of respiratory syncytial virus among hospitalized children in Guangzhou from 2013 to 2017]." @default.
• W3012946543 doi "https://doi.org/10.3760/cma.j.issn.0253-9624.2020.03.010" @default.
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