Objective: To study the prevalence and genetic characteristics of human respiratory syncytial virus (HRSV) in Quanzhou city, from 2018 to 2019. Methods: A total of 141 throat swabs were collected from children patients of lower respiratory tract infection in Quanzhou children Hospital, Fujian Province from November 2018 to May 2019. RT-PCR was used to amplify the 3 'end of G gene HRSV. Sequencer 5.0 and MEGA5.05 softwares were used for sequence editing, phylogenetic tree construction and genotyping analysis. Results: Twenty-five samples were positive for HRSV. Seventeen samples succeeded to obtain the target gene, including 13 of HRSVA and 4 of HRSVB. Two genotypes were identified: ON1 genotype (13 samples, HRSVA) and BA9 genotype (4 samples, HRSVB). Five strains of ON1 genotype sequences were clustered with the ON1 sequences prevalent in Beijing, Changchun and Zhejiang from 2012 to 2015 (cluster1); one strain (FJ19-02) was clustered with the sequences of ON1 genotype circulating in many regions of China from 2012 to 2015 (cluster2); Seven strains were clustered independently (cluster FJ). FJ18-02, FJ19-14 and FJ19-15 of HRSVB were clustered with the BA9 genotype sequences prevalent in Changchun, Jilin Province in 2015, while FJ19-13 was closely related to the BA9 genotype sequences prevalent in Guangzhou and Zhejiang Province in 2013. Both the ON1 and BA9 genotypes showed variations of nucleotide and amino acid in 72 and 60 insertion segments. Amino acid mutation (H266L) only occurred among the sequence of cluster-FJ, and the mutations of H261Q and Q265L only appeared in strain FJ19-13. Conclusion: BA9 and ON1 genotypes were prevalent in Quanzhou city, from 2018 to 2019. Cluster-FJ was a newly discovered independent transmission chain, which may continue to circulate in local Quanzhou area.
目的： 分析泉州2018—2019年人呼吸道合胞病毒（HRSV）流行情况和基因特征。 方法： 样本来自2018年11月至2019年5月福建省泉州市儿童医院送检的下呼吸道感染患儿咽拭子样本，共141份。采用RT-PCR法进行HRSVG基因3′末端靶基因扩增，使用sequencher 5.0以及MEGA5.05软件进行序列编辑、进化树构建和基因特征分析。 结果： HRSV阳性样本25份，17份样本成功获得靶基因序列，其中HRSVA 13份，HRSVB 4份；共鉴定出两个基因型：ON1基因型（13份，HRSVA）和BA9基因型（4份，HRSVB）。5条ON1基因型靶基因序列与2012—2015年北京、长春和浙江流行的ON1基因型序列汇聚为一簇（Cluster1）；1条（FJ19-02）与2012—2015年我国多个地区流行的ON1基因型序列汇聚为一簇（Cluster2）；其余7条为独立的一簇（Cluster-FJ）。HRSVB亚型中FJ18-02、FJ19-14、FJ19-15与2015年在吉林长春流行的BA9基因型序列汇聚在一起；FJ19-13则与2013年在广州和浙江两地流行的BA9基因型序列具有较近的亲缘性。ON1基因型和BA9基因型均在重复插入的72和60个碱基片段区出现了核苷酸和氨基酸变异。Cluster-FJ分支靶基因序列出现了特征性氨基酸突变（H266L）；FJ19-13出现了H261Q和Q265L的独立突变。 结论： 2018—2019年福建泉州流行的HRSV基因型为BA9和ON1，Cluster-FJ为新发现的独立传播链，有可能在泉州建立了本土循环流行。.