Surveillance and analysis of Haemaphysalis longicornis with SFTS virus in Tumen river basin located in the frontiers of Russia, Korea and Northeast China
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摘要:
目的 掌握图们江流域中朝俄边境地区长角血蜱分布特征,了解该地区长角血蜱携带发热伴血小板减少综合征(severe fever with thrombocytopenia syndrome,SFTS)病毒情况,分离病毒,分析其基因特征。 方法 2017年4月~9月,在吉林省图们江流域中朝俄边境地区珲春市、图们市、和龙市、龙井市采集蜱虫进行形态学分类,选择新鲜长角血蜱对其进行分组,采用实时荧光定量多聚核苷酸链式反应方法检测SFTS病毒。对阳性样品,利用绿猴肾细胞进行病毒分离,并扩增S、M、L基因片段,比对同源性,建立系统进化树,分析其基因特征。 结果 长角血蜱主要分布在图们江下游珲春市和图们市,为该两县优势种,分别达到71.85%和87.62%。在珲春市长角血蜱中分离到一株病毒,命名为YBHC-TICK2-2017/CHINA。该病毒S片段(1 746 bp)、M片段(3 336 bp)、L片段(6 376 bp)基因序列与美国国家生物技术信息中心(National Center for Biotechnology Information,NCBI)DNA序列数据库中记录的中国和韩国SFTS病毒分离株基因序列同源性为98.00%~99.00%。系统进化树分析,该病毒株S片段基因序列与中国吉林株(KT890282)分为一簇,M片段和L片段基因序列与中国江苏株(KR230781)分为一簇。 结论 长角血蜱在图们江下游中朝俄边境地区具有广泛的分布。该研究首次在该地区长角血蜱中分离到SFTS病毒,提示该地区为SFTS防控重点区域。 Abstract:Objective To mastered the distribution characteristics of Haemaphysalis longicornis in the Tumen River basin along the border between Russia, Korea and Northeast China, and understand the status of Haemaphysalis longicornis carrying the virus of fever with thrombocytopenia syndrome (SFTS), then, isolate the virus and analyze its genetic characteristics. Method Ticks were collected from Hunchun, Tumen, Helong and Longjing cities in the Tumen River basin of Jilin Province from April to September, 2017. Haemaphysalis longicornis was selected and grouped. SFTS virus was detected by real-time quantitative polymerase chain reaction (RT-qPCR). Virus isolation was carried out in Vero cells, besides, S, M, L gene segments were amplified. The homology of S, M and L gene segments was compared, phylogenetic tree was established, and their gene characteristics were analyzed. Result Haemaphysalis longicornis mainly distributed in Hunchun and Tumen City in the lower reaches of Tumen River. It was the dominant species in the two counties, reaching 71.85% and 87.62% respectively. A virus named YBHC-TICK2-2017/CHINA was isolated from Haemaphysalis longicornis collected in Hunchun. The sequences of S segment (1 746 bp), M segment (3 336 bp) and L segment (6 376 bp) of the virus were 98.00%-99.00%, homologous to those of SFTS virus isolates from China and Korea recorded in National Center for Biotechnology Information (NCBI) Gen Bank. Phylogenetic tree analysis showed that the S segment gene sequence of the virus strain was divided into a cluster with Jilin strain (KT890282) in China, and M segment and L segment gene sequence with Jiangsu strain (KR230781) in China. Conclusions Haemaphysalis longicornis are widely distributed in the lower reaches of the Tumen river. It was the first time that SFTS virus was isolated from Haemaphysalis longicornis in this area, suggesting that this area is important for SFTS prevention. -
Key words:
- SFTS /
- Virus isolation /
- Vectors /
- Haemaphysalis longicornis
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表 1 不同县蜱构成[n(%)]
Table 1. The tick composition in different counties[n(%)]
地点 森林革蜱 嗜群血蜱 日本血蜱 长角血蜱 全沟硬蜱 其他 龙井市 251(16.98) 899(60.83) 317 (21.45) 0 (0.00) 10 (0.68) 1 (0.07) 和龙市 3(0.45) 5(0.75) 249 (37.39) 0 (0.00) 409 (61.41) 0 (0.00) 珲春市 30(2.76) 15(1.38) 26 (2.39) 781 (71.85) 12 (1.10) 223 (20.52) 图们市 2(0.40) 12(2.40) 41 (8.18) 439 (87.62) 1 (0.20) 6 (1.20) 合计 286(7.66) 931(24.95) 633 (16.96) 1 220 (32.69) 432 (11.58) 230 (6.16) -
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