为了解云南省山羊群中的地方性鼻内肿瘤病毒（enzootic nasal tumor virus，ENTV）感染情况，2017年在云南省南部边境地区江城县采集山羊血分离血浆，采用随机PCR（random PCR）进行扩增、克隆，结果从20份血浆中获得与ENTV 2型（ENTV-2）同源性较高的2条序列；根据ENTV-2 CHN1（KU258870）毒株序列设计一套半巢式引物，对采集的20份血浆进行核酸检测，结果4份为阳性。序列分析发现，检测到的4条序列与四川、福建等地流行的ENTV-2位于同一个进化分支，它们之间的核苷酸同源性为96.3%~99.5%，氨基酸同源性为95.3%~99.0%，提示江城县羊群中流行的ENV-2可能与四川省、福建省流行毒株相关；位点分析结果显示，江城县的这4份ENTV-2核酸阳性样品在env蛋白186和204位发生了独特的“G→E”氨基酸位点突变，其中1份在178位还发生了“T→P”的氨基酸位点突变。结果表明，江城县山羊群中存在ENTV-2感染，且流行的ENTV-2呈现一些特有的分子特征。因此，云南省需要加强ENTV监测，了解其在山羊群中的流行情况及其演变规律。本研究为进一步开展ENTV感染调查和山羊呼吸道疾病的诊断和预防提供了依据。
In order to investigate the infection of enzootic nasal tumor virus（ENTV）in goats in Yunnan Province，goat blood was collected in 2017 to isolate plasma in Jiangcheng County，the southern border area of Yunnan Province，followed by amplification by random PCR and clone，then two sequences with high homology with ENTV-2 were obtained from 20 plasma samples；a set of semi-nested primers were designed based on the sequence of ENTV-2 CHN1（KU258870）to detect the nucleic acid of 20 plasma samples，in which four were positive. It was found that，by sequence analysis，the four sequences were located in the same evolutionary clade as ENTV-2 prevalent in Sichuan and Fujian provinces，with nucleotide homology of 96.3% to 99.5% and amino acid homology of 95.3% to 99.0%，which indicated that ENTV-2 prevalent in goats in the county might be related to those in Sichuan and Fujian provinces；by site analysis，a unique“G→E”amino acid mutation was observed in the four strains when they were located at the positions of 186 and 204 of env protein，and“T→P”in one strain at the position of 178. In conclusion，goats in the county were infected with ENTV-2 that showed some unique molecular characteristics. Therefore，ENTV should be strictly monitored to identify its prevalence and rule of evolution in goats in the province，and then to provide a basis for further efforts against the disease.