Epidemiology and Genetic Variation of Duck Hepatitis A Virus Type 1 Circulating in Some Regions of China
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摘要: 为了解鸭群中鸭1型甲肝病毒(DHAV-1)的流行及其分子变异情况,对2015-2016年福建、广东、浙江及江西鸭群采集的327份临床样品进行检测、病毒分离鉴定、序列测定与分析。结果表明,自327份临床样品中检出DHAV-1阳性样品35份,阳性率10.7%;从阳性样品中分离获得23株DHAV-1,主要来自30日龄以内的麻鸭和半番鸭。对DHAV-1的VP1基因分子特征及遗传变异分析,表明23株病毒VP1基因核苷酸序列同源性介于93.3%~99.9%,分属2个病毒亚群,两亚群间的遗传距离为0.06。23株临床分离株中有18株与引起雏鸭胰腺泛黄的毒株(MPZJ1206株)处于同一亚群,为目前流行的优势毒株,与国内外疫苗株核苷酸同源性在91.3%~96.2%,存在较大差异。由此可见,我国福建省及周边地区鸭群中不同DHAV-1流行株之间及流行毒株与疫苗株间均存在不同程度的差异。Abstract: The epidemic prevalence and molecular variation of duck hepatitis A virus type 1 (DHAV-1) were investigated. Three-hundred-twenty-seven clinical samples collected in 2015-2016 from Fujian and surrounding provinces were used for the virus detection and isolation. Thirty-five of these samples (10.7%)were found to be pusitive for DHAV-1. From the 35 positive specimens, 23 strains were isolated, mainly from shelducks and mule ducks of less than 30-day-old. The sequence analysis on VP1 gene of the 23 isolates showed 93.3%-99.9% homology, and the strains could be divided into 2 subgroups with a genetic distance of 0.06. Among them, 18 isolates clustered in a currently prevalent subgroup which contains the virus (MPZJ1206)causing yellowed-pancreas in ducklings. On the other hand, all 23 isolates shared merely 91.3-96.2% nucleotide sequence homology with the strain used for vaccination abroad and domestically. It appeared that genetic variations existed among the various DHAV-1 strains.
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Key words:
- duck hepatitis A virus type 1 /
- VP1 gene /
- variation analysis
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表 1 样品来源
Table 1. Sources of specimens
序号 省份 主要来源地 样品类型 样品数 1 福建 福州、莆田、漳州、三明、福清、南平、宁德 肝脏及脾脏等 187 2 广东 清远、湛江、广州、惠州 肝脏及脾脏等 65 3 浙江 金华、宁波、湖州 肝脏及脾脏等 42 4 江西 南昌、南城、吉安 肝脏及脾脏等 33 总计 肝脏及脾脏等 327 表 2 分离毒株信息
Table 2. Information on isolated viruses
毒株名称 宿主 日龄/d 采集年份 主要剖检病变 FQ12SD-0111 麻鸭 12 2015 肝肿大出血 FQ10SD-0119 麻鸭 10 2015 肝肿大出血 FQ20SD-0131 麻鸭 20 2015 肝肿大出血 FZ12SD-0413 麻鸭 12 2015 胰腺泛黄 CL26SD-0426 麻鸭 26 2015 肝肿大出血 CL12SD-0425 麻鸭 12 2015 肝、肾肿大出血 CL12SD-0506 麻鸭 12 2015 肝肿大出血 MH07SD-0701 麻鸭 7 2015 肝肿大出血 MH09SD-0409 麻鸭 9 2015 肝出血 FQ06SD-0412 麻鸭 6 2015 肝、肾肿大出血 FZ10SD-0703 麻鸭 10 2015 肝、肾肿大出血 MH10MD-0515 半番鸭 10 2015 胰腺泛黄 GT15MD-0312 半番鸭 15 2015 肝出血 MH08MD-0409 半番鸭 8 2015 肝出血 YT15MD-0411 半番鸭 15 2015 胰腺泛黄 MH08MD-0417 半番鸭 8 2015 肝肿大出血 FZ167MD-0517 半番鸭 167 2016 肝出血,肾肿大 ZZ02MD-0617 半番胚 24 2016 - GT30MD-0228 番鸭 30 2015 肝出血 GD20MD-0301 番鸭 20 2016 肝出血 SD23CD-0825 樱桃谷鸭 23 2015 肝、脾肿大出血 FZ10CD-0514 樱桃谷鸭 10 2016 肝出血 JH51Gu-0307 鹌鹑 未知 2015 肺脏出血、脑膜炎 表 3 不同DHAV毒株VP1基因序列同源性分析
Table 3. Homology analysis on VP1 gene of DHAV isolates
基因型 毒株名称(分离年份) 序列同源性/% 核苷酸 氨基酸 DHAV-1 本研究分离株(2015-2016) 93.3~99.9 94.4~100 FZ05(2005) 91.3~93.7 95.8~97.6 ZJ(2007) 91.8~95.1 93.5~96.3 03D(2005) 93.5~95.6 95.3~98.6 LQ57(2011年前) 93.5~95.9 94.9~97.2 H(1993) 92.7~95.4 95.8~98.1 FJ1220(2012) 94.4~99.6 95.3~100 GD(2012) 94.4~99.6 95.8~99.5 MPZJ1206(2012) 94.3~99.7 94.9~99.5 FJ1407(2014) 93.9~99.3 94.9~99.5 JX1405(2014) 93.9~99.3 94.9~99.5 Du/CH/LGD/111239(2011) 94.1~99.2 94.4~98.1 Du/CH/LGD/111238(2011) 94.3~99.0 94.4~97.6 A66(2006年前) 94.0~96.2 95.3~98.5 CH60(2000) 94.1~96.2 95.8~98.5 C80(2006年前) 94.1~96.4 95.8~99.0 DHAV-2 90D(1990) 64.9~67.1 68.9~71.2 04G(2004) 65.1~67.2 69.2~72.5 DHAV-3 Du/CH/LJS/90905(2009) 67.3~70.2 75.7~78.2 G(1999) 67.1~70.1 75.7~78.2 AP03337(2004) 65.9~69.0 75.2~78.3 -
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