鹅星状病毒的分离鉴定及全基因组序列分析

2017年10月—2019年5月，本实验室从广东、四川、河北、山东、安徽、辽宁等广大养鹅地区采集了67份典型雏鹅痛风样品进行了实验室检测以及病原的分离鉴定，检测结果表明：所有样品中均检测到了鹅星状病毒，并且约有94.03%的样品为两个不同种的鹅星状病毒混合感染。病原分离结果表明：鹅星状病毒FLX株的变异株病毒（命名为SCCD）可以在鹅胚上稳定增殖，并且能稳定致死10日龄鹅胚，致病力较鹅星状病毒FLX增强；新型鹅星状病毒株（命名为SDPD）不能在鹅胚和SPF鸡胚上稳定增殖。病毒的基因组测序结果表明：鹅星状病毒FLX株与鹅星状病毒FLX的变异株病毒SCCD株、新型鹅星状病毒SDPD株全基因组核苷酸相似性分别为89.7%、58.1%，ORF1b基因氨基酸相似性分别为98.4%、61.0%，ORF2基因氨基酸相似性分别为81.0%、42.5%。将新分离的鹅星状病毒株接种1日龄健康雏鹅，结果表明，鹅星状病毒SCCD株和鹅星状病毒SDPD株虽然能使雏鹅发生死亡，引起肝炎、肾肿胀和增重减少等变化，但雏鹅均无典型痛风（脏器尿酸盐沉积）表现，而两种鹅星状病毒株混合攻毒能使44%的雏鹅发生典型痛风，并与临床发病症状一致。因此，临床上引起雏鹅痛风的病原可能是两种鹅星状病毒，即新型鹅星状病毒和鹅星状病毒FLX的变异株病毒。

Isolation,Identification and Complete Genomic Sequence Analysis of Goose Astrovirus

From October 2017 to May 2019, 67 samples of typical goslings gout were collected from Guangdong, Sichuan, Hebei, Shandong, Anhui, Liaoning provinces and other vast goose-raising areas in China. The results showed that goose astrovirus was detected in all samples and about 94.03% of the samples were infected by two different kinds of goose astrovirus. The pathogenicity of goose astrovirus FLX variant strain (named SCCD) which could stably proliferate in goose embryos and kill 10-day-old goose embryos was more virulent than goose astrovirus FLX strain. The new type of goose astrovirus strain (named SDPD) could't stably proliferate in goose embryos and SPF chicken embryos. The whole genome nucleotides homology of goose astrovirus FLX strain with goose astrovirus SCCD strain and the new type goose astrovirus SDPD strain were 89.7% and 58.1%, the amino acids homology of ORF1b gene were 98.4% and 61.0%, the amino acids homology of ORF2 gene were 81.0% and 42.5%, respectively. The newly isolated goose astrovirus strains were inoculated into 1-day-old healthy goslings, the results showed that although the goose astrovirus SCCD strain and the new type goose astrovirus SDPD strain could cause the death of goslings and the changes of hepatitis, kidney swelling and weight loss, none of the goslings showed typical gout characteristics (urate deposition in the organs of the body), however, 44% of goslings were characterized with typical gout which was consistent with the symptoms of natural disease after coinfected by the two goose astrovirus strains. Therefore, the pathogenic agents of goslings gout may be two different kinds of goose astrovirus, namely the new type of goose astrovirus and the variant of goose astrovirus FLX.