Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this r...Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this research,the prevalence and genetic diversity of PCV3 were investigated in above area.Lung tissue samples(n=491)from 19 pig slaughterhouses across 11 cities throughout Shanxi Province were analyzed for PCV3 infection by PCR in 2019.The results showed that PCV3 positive rates in slaughterhouses and individuals were 100%(19/19)and 86.76%(426/491),respectively.PCV2 and PCV3 double-positive rates in slaughterhouses and individuals were 100%(19/19)and 59.27%(291/491),respectively.PCR positive samples were further sequenced and 8 PCV3 isolates were identified.The nucleotide homology of these isolates with other PCV3 isolates in NCBI database was 97.45-99.90%.A phylogenetic analysis,based on the complete genomic sequence and ORF2,divided these PCV3 strains into 2 major groups.Based on A24A/and R27/K amino acid mutations of capsid protein,the 8 identified PCV3 strains were separated to 2 clades.This was the first detailed investigation into the epidemiology of PCV3 in Shanxi Province.Our findings enabled us to assess the possibility of widespread transmission from this region.Thus,current findings establish a basis for further studies of genetic variations in PCV3 strains circulating in China.展开更多
Human adenovirus type 3(HAdV-3)is widely prevalent all over the world,especially in Asia.The objective of this study is to carry out complete genomie DNA sequencing and the phylogenetic analysis for two strains(Guangz...Human adenovirus type 3(HAdV-3)is widely prevalent all over the world,especially in Asia.The objective of this study is to carry out complete genomie DNA sequencing and the phylogenetic analysis for two strains(Guangzhou01 and Guangzhou02)of HAdV-3 wild virus isolated from South Chi- na.Nasopharyngeal secretion aspirate specimens of sick children were inoculated into HEp-2 and HeLa culture tubes,and the cultures were identified by neutralization assay with type-specific reference rabbit antiserum.Type-specific primers were also utilized to confirm the serotype.The restriction fragments of HAdV genome DNA were cloned into pBlueScript SK(+)vectors and sequenced,and the 5' and 3' ends of the linear HAdV-3 genome were directly sequenced with double purified genomic DNA as tem- plates.General features of the HAdV-3 genome sequences were explored by using several bio-software. Phylogenetic analysis was done with MEGA 3.0 software.The genomic sequences of Guangzhou01 and Guangzhou02 possess the same 4 early regions and 5 late regions and have 39 coding sequences and two RNA coding sequences.Other non-coding regions are conservative.Inverted repeats and palindromes were identified in the genome sequences.The genomes of group B human adenovirus as well as HAdV-3 have close phylogenetic relationship with that of chimpanzee adenovirus type 21.The genomic lengths of these two isolated strains are 35 273 bp and 35 269 bp,respectively.The phylogenetic analysis showed that HAdV-B species has some relationship with certain types of chimpanzee adenovirus.展开更多
猪圆环病毒3型(porcine circovirus type 3,PCV3)是2016年由美国首次报道引起母猪繁殖障碍的一种新型猪圆环病毒,该病毒的致病性尚不完全清楚。为研究PCV3对断奶仔猪的致病性,本研究用PK-15细胞自临床病料分离到1株PCV3毒株,命名为PCV3/...猪圆环病毒3型(porcine circovirus type 3,PCV3)是2016年由美国首次报道引起母猪繁殖障碍的一种新型猪圆环病毒,该病毒的致病性尚不完全清楚。为研究PCV3对断奶仔猪的致病性,本研究用PK-15细胞自临床病料分离到1株PCV3毒株,命名为PCV3/CH/HB/XY/2018,全基因组测序分析表明,该毒株属于PCV3a-IM基因亚型。分别用PCV3阳性病料初始匀浆液和第8代细胞培养物采用滴鼻和肌肉注射2种方式感染28日龄断奶仔猪,每组试验猪5头,并设置空白对照组。通过观察和分析试验猪的临床表现、体温、增重、病毒血症、各组织的病毒载量和病理变化等方面评价仔猪感染试验结果。结果显示:PCV3阳性病料初始匀浆液和细胞培养物在感染断奶仔猪后均会引起仔猪出现体温上升、消瘦、皮炎和生长缓慢等现象;病毒血症时间超过14 d,但21 d消失,病毒的组织分布结果表明,PCV3主要感染扁桃体、淋巴结等免疫器官,在脾、肺和扁桃体等组织中的病毒载量最高;感染猪可出现间质性肺炎、淋巴小结增生和嗜酸性粒细胞增多等病理变化。本研究表明PCV3/CH/HB/XY/2018毒株对断奶仔猪有致病性,为PCV3的致病机制研究奠定了基础。展开更多
猪圆环病毒3型(porcine circovirus type 3,PCV3)从2015年发现至今已在全世界多个国家和地区的养猪业被检出,是重要的新发猪病病原体。目前有关PCV3致病机制的研究有限,大部分集中于PCV3的流行病学调查、基因组演化分析和检测方法建立...猪圆环病毒3型(porcine circovirus type 3,PCV3)从2015年发现至今已在全世界多个国家和地区的养猪业被检出,是重要的新发猪病病原体。目前有关PCV3致病机制的研究有限,大部分集中于PCV3的流行病学调查、基因组演化分析和检测方法建立。猪圆环病毒(porcine circovirus,PCV)与宿主之间关系紧密且复杂,二者的相互作用决定宿主细胞的命运和病毒的传播与存活。部分学者通过瞬转表达系统、临床分离和反向遗传学技术从病毒组分或全病毒水平对PCV3与宿主相互作用展开研究。本文系统阐述宿主细胞对PCV3感染的应答机制、PCV3-宿主蛋白的相互作用,以及PCV3生命周期的研究结果,将有助于进一步了解PCV3及其致病机制。展开更多
本研究旨在通过TB Green Real-time PCR的方法对国内6个省(四川省、山西省、河南省、河北省、江苏省和内蒙古自治区)的9个规模化养牛场140份以流鼻涕、发热、咳嗽、呼吸困难为特征的病牛呼吸道鼻拭子样本开展牛腺病毒3型(bovine adenovi...本研究旨在通过TB Green Real-time PCR的方法对国内6个省(四川省、山西省、河南省、河北省、江苏省和内蒙古自治区)的9个规模化养牛场140份以流鼻涕、发热、咳嗽、呼吸困难为特征的病牛呼吸道鼻拭子样本开展牛腺病毒3型(bovine adenovirus type 3,BAdV-3)感染状况调查,并对其中的阳性样本进行fiber轴区基因检测。结果显示,140份样品中BAdV-3阳性率为36.4%,除河北省以外,其余各省均有BAdV-3检出,其中,四川及河南省检出率最高,分别达到82.9%(29/35)和83.3%(10/12)。其中,传统型占总阳性比的80.4%,fiber轴区缺失毒株占总阳性样本的19.6%。缺失位置与数量一致,轴区连续缺失237个碱基对(79个氨基酸),且缺失型仅在四川和河南两省检出,检出率分别为24.1%(7/29)和30%(3/10),场群阳性率分别为100%(2/2)和100%(1/1)。结果表明,BAdV-3已在我国牛场中广泛分布,目前流行的主要以传统型毒株为主,fiber轴区缺失毒株在我国具有独特的地域分布,主要在四川和河南省流行。展开更多
2022年6月福建省龙岩市某规模化猪场的母猪陆续发病,临床主要表现为病猪的膝关节轻微肿大,不愿久站,甚至站立困难。为查明发病原因,对病猪进行病理剖检,并采集血液和膝关节积液样品,分别用于生猪常见疫病病原体的核酸检测和微生物的分...2022年6月福建省龙岩市某规模化猪场的母猪陆续发病,临床主要表现为病猪的膝关节轻微肿大,不愿久站,甚至站立困难。为查明发病原因,对病猪进行病理剖检,并采集血液和膝关节积液样品,分别用于生猪常见疫病病原体的核酸检测和微生物的分离培养。结果显示:病理剖检未发现主要脏器的明显病变;血液样品的核酸检测显示,猪圆环病毒3型(Por⁃cine Circovirus type 3,PCV3)为阳性,未检出其它主要病原体;膝关节积液样品的微生物培养产物的显微镜镜检结果显示有酵母样真菌,经培养产物的PCR扩增和DNA测序表明:该酵母样真菌为近平滑假丝酵母菌(Candida parapsilosis)。结论:该病例为猪圆环病毒3型(PCV-3)与近平滑假丝酵母菌的混合感染。根据文献查询,这是世界首例有关近平滑假丝酵母菌导致生猪膝关节深部感染并从膝关节积液中成功分离到近平滑假丝酵母菌的报道。展开更多
基金This research was supported by funding from the Key Research and Development Projea Key Program of Shanxi Province,China(grant no.201703D211001).
文摘Porcine circovirus type 3(PCV3),which was first detected in the United States of America in 2015,is a potential threat to the swine industry.However,the prevalence of PCV3 in Shanxi Province,China,is unclear.In this research,the prevalence and genetic diversity of PCV3 were investigated in above area.Lung tissue samples(n=491)from 19 pig slaughterhouses across 11 cities throughout Shanxi Province were analyzed for PCV3 infection by PCR in 2019.The results showed that PCV3 positive rates in slaughterhouses and individuals were 100%(19/19)and 86.76%(426/491),respectively.PCV2 and PCV3 double-positive rates in slaughterhouses and individuals were 100%(19/19)and 59.27%(291/491),respectively.PCR positive samples were further sequenced and 8 PCV3 isolates were identified.The nucleotide homology of these isolates with other PCV3 isolates in NCBI database was 97.45-99.90%.A phylogenetic analysis,based on the complete genomic sequence and ORF2,divided these PCV3 strains into 2 major groups.Based on A24A/and R27/K amino acid mutations of capsid protein,the 8 identified PCV3 strains were separated to 2 clades.This was the first detailed investigation into the epidemiology of PCV3 in Shanxi Province.Our findings enabled us to assess the possibility of widespread transmission from this region.Thus,current findings establish a basis for further studies of genetic variations in PCV3 strains circulating in China.
文摘Human adenovirus type 3(HAdV-3)is widely prevalent all over the world,especially in Asia.The objective of this study is to carry out complete genomie DNA sequencing and the phylogenetic analysis for two strains(Guangzhou01 and Guangzhou02)of HAdV-3 wild virus isolated from South Chi- na.Nasopharyngeal secretion aspirate specimens of sick children were inoculated into HEp-2 and HeLa culture tubes,and the cultures were identified by neutralization assay with type-specific reference rabbit antiserum.Type-specific primers were also utilized to confirm the serotype.The restriction fragments of HAdV genome DNA were cloned into pBlueScript SK(+)vectors and sequenced,and the 5' and 3' ends of the linear HAdV-3 genome were directly sequenced with double purified genomic DNA as tem- plates.General features of the HAdV-3 genome sequences were explored by using several bio-software. Phylogenetic analysis was done with MEGA 3.0 software.The genomic sequences of Guangzhou01 and Guangzhou02 possess the same 4 early regions and 5 late regions and have 39 coding sequences and two RNA coding sequences.Other non-coding regions are conservative.Inverted repeats and palindromes were identified in the genome sequences.The genomes of group B human adenovirus as well as HAdV-3 have close phylogenetic relationship with that of chimpanzee adenovirus type 21.The genomic lengths of these two isolated strains are 35 273 bp and 35 269 bp,respectively.The phylogenetic analysis showed that HAdV-B species has some relationship with certain types of chimpanzee adenovirus.
文摘猪圆环病毒3型(porcine circovirus type 3,PCV3)从2015年发现至今已在全世界多个国家和地区的养猪业被检出,是重要的新发猪病病原体。目前有关PCV3致病机制的研究有限,大部分集中于PCV3的流行病学调查、基因组演化分析和检测方法建立。猪圆环病毒(porcine circovirus,PCV)与宿主之间关系紧密且复杂,二者的相互作用决定宿主细胞的命运和病毒的传播与存活。部分学者通过瞬转表达系统、临床分离和反向遗传学技术从病毒组分或全病毒水平对PCV3与宿主相互作用展开研究。本文系统阐述宿主细胞对PCV3感染的应答机制、PCV3-宿主蛋白的相互作用,以及PCV3生命周期的研究结果,将有助于进一步了解PCV3及其致病机制。
文摘本研究旨在通过TB Green Real-time PCR的方法对国内6个省(四川省、山西省、河南省、河北省、江苏省和内蒙古自治区)的9个规模化养牛场140份以流鼻涕、发热、咳嗽、呼吸困难为特征的病牛呼吸道鼻拭子样本开展牛腺病毒3型(bovine adenovirus type 3,BAdV-3)感染状况调查,并对其中的阳性样本进行fiber轴区基因检测。结果显示,140份样品中BAdV-3阳性率为36.4%,除河北省以外,其余各省均有BAdV-3检出,其中,四川及河南省检出率最高,分别达到82.9%(29/35)和83.3%(10/12)。其中,传统型占总阳性比的80.4%,fiber轴区缺失毒株占总阳性样本的19.6%。缺失位置与数量一致,轴区连续缺失237个碱基对(79个氨基酸),且缺失型仅在四川和河南两省检出,检出率分别为24.1%(7/29)和30%(3/10),场群阳性率分别为100%(2/2)和100%(1/1)。结果表明,BAdV-3已在我国牛场中广泛分布,目前流行的主要以传统型毒株为主,fiber轴区缺失毒株在我国具有独特的地域分布,主要在四川和河南省流行。
文摘2022年6月福建省龙岩市某规模化猪场的母猪陆续发病,临床主要表现为病猪的膝关节轻微肿大,不愿久站,甚至站立困难。为查明发病原因,对病猪进行病理剖检,并采集血液和膝关节积液样品,分别用于生猪常见疫病病原体的核酸检测和微生物的分离培养。结果显示:病理剖检未发现主要脏器的明显病变;血液样品的核酸检测显示,猪圆环病毒3型(Por⁃cine Circovirus type 3,PCV3)为阳性,未检出其它主要病原体;膝关节积液样品的微生物培养产物的显微镜镜检结果显示有酵母样真菌,经培养产物的PCR扩增和DNA测序表明:该酵母样真菌为近平滑假丝酵母菌(Candida parapsilosis)。结论:该病例为猪圆环病毒3型(PCV-3)与近平滑假丝酵母菌的混合感染。根据文献查询,这是世界首例有关近平滑假丝酵母菌导致生猪膝关节深部感染并从膝关节积液中成功分离到近平滑假丝酵母菌的报道。
