Article(id=1307013140584100842, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, articleNumber=null, orderNo=null, doi=10.11843/j.issn.0366-6964.2026.02.032, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1748880000000, receivedDateStr=2025-06-03, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1789545815845, onlineDateStr=2026-09-16, pubDate=1771776000000, pubDateStr=2026-02-23, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789545815845, onlineIssueDateStr=2026-09-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789545815845, creator=13701087609, updateTime=1789545815845, updator=13701087609, issue=Issue{id=1307013104081068276, tenantId=1146029695717560320, journalId=1306274286668972124, year='2026', volume='57', issue='2', pageStart='569', pageEnd='1176', issueExtLink='null', onlineDate='null', pubDate='1771776000000', pubDateStr='2026-02-23', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789545807142, creator='13701087609', updateTime=1789609910854, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1307281975350419753, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1307281975350419754, tenantId=1146029695717560320, journalId=1306274286668972124, issueId=1307013104081068276, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=955, endPage=964, ext={EN=ArticleExt(id=1307013140806398955, articleId=1307013140584100842, tenantId=1146029695717560320, journalId=1306274286668972124, language=EN, title=Replication Characteristics and Pathogenicity of a Cell-Adapted Porcine Epidemic Diarrhea Virus G2b Strain, columnId=1307007432299930010, journalTitle=Acta Veterinaria et Zootechnica Sinica, columnName=PREVENTIVE VETERINARY MEDICINE, runingTitle=null, highlight=null, articleAbstract=

The aim of this study was to investigate the replication characteristics and pathogenicity of a cell-adapted strain derived from a prevalent PEDV isolate. The viral strain isolated from a large-scale pig farm was serially passaged in Vero cells to different generations. The biological characteristics of the virus were evaluated in vitro, and the 25th (F25) and 141st (F141) passages were inoculated into 3-day-old piglets to compare their pathogenic differences. The results showed that typical syncytial cytopathic effects (CPE) caused by PEDV were observed in Vero cells at the 4th blind passage of the clinical inoculum. By the 25th passage, both the CPE morphology and viral titers had stabilized. Upon reaching the 141st passage, the viral titer increased significantly and induced a more rapid cytopathic effect. Indirect immunofluorescence assay (IFA) specifically detected the expression of the PEDV N protein, and genomic sequence analysis identified the strain as genotype G2b. Pig challenge experiments demonstrated that, compared with the low-passage parental strain (YJH/2017/F25), the YJH/2017/F141-inoculated group showed no significant clinical symptoms or histopathological lesions, along with a significant reduction in viral shedding via anal swabs. All assessed parameters showed no significant difference from those of the DMEM control group, indicating reduced pathogenicity and favorable safety profile of the strain. These findings indicate that after serial in vitro passaging, the prevalent PEDV strain acquired enhanced cell adaptability while exhibiting decreased pathogenicity in neonates. This study provides a promising candidate strain for the development of an attenuated PEDV vaccine, and its complete genomic sequence and biological characteristics establish a foundation for further research on recombinant viruses.

, authors=Fan YANG1, Guofang HU1, Ziwen WEI1, Yingshan ZHOU1, Houhui SONG1, Haijian HE2, Wanyu DONG1, Xiaodu WANG1, authorsList=Fan YANG, Guofang HU, Ziwen WEI, Yingshan ZHOU, Houhui SONG, Haijian HE, Wanyu DONG, Xiaodu WANG, authorCompany=null, correspAuthors=Haijian HE, Wanyu DONG, Xiaodu WANG, authorNote=null, correspAuthorsNote=
WANG Xiaodu, E-mail:
DONG Wanyu, E-mail:
HE Haijian, E-mail:
, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1307013143092294652, articleId=1307013140584100842, tenantId=1146029695717560320, journalId=1306274286668972124, language=CN, title=一株猪流行性腹泻病毒G2b亚型细胞适应性毒株的复制特性及致病性, columnId=1307007432459313564, journalTitle=畜牧兽医学报, columnName=预防兽医, runingTitle=null, highlight=null, articleAbstract=

旨在探究猪流行性腹泻病毒(PEDV)流行株细胞适应后的复制特性及致病性,本研究将分离自某规模化猪场的PEDV流行毒株在Vero细胞中连续传代至不同代次,分别评价该毒株在细胞上的生物学特性,并将第25代和第141代病毒接种至3日龄仔猪,以比较其致病性差异。结果表明:临床病料接种液盲传至第4代时,在Vero细胞上形成PEDV典型合胞体病变;传代至25代时,细胞病变形态与病毒滴度趋于稳定;传代至141代时,病毒滴度显著提高,并诱发更快速的细胞病变效应。间接免疫荧光试验(IFA)可特异性检出PEDV N蛋白表达,序列分析表明该毒株为G2b型。仔猪攻毒试验表明,与亲本低代次毒株(YJH/2017/F25)相比,YJH/2017/F141接种组未出现明显临床症状或组织病理损伤,且肛拭子病毒排放量显著减少,各项指标与DMEM对照组无显著差异,该毒株的致病性较低而具有较好安全性。以上结果说明该流行毒株在体外连续传代后获得了更好的细胞适应性且对新生仔猪的致病性降低,本研究为PEDV弱毒疫苗研发提供新的候选毒株,其全基因组序列和生物学特征也为后续重组病毒研究奠定了基础。

, authors=杨帆1, 胡国芳1, 魏子文1, 周莹珊1, 宋厚辉1, 何海健2, 董婉玉1, 王晓杜1, authorsList=杨帆, 胡国芳, 魏子文, 周莹珊, 宋厚辉, 何海健, 董婉玉, 王晓杜, authorCompany=null, correspAuthors=何海健, 董婉玉, 王晓杜, authorNote=

杨帆,主要从事猪流行性腹泻病毒复制机制研究,E-mail:

, correspAuthorsNote=
王晓杜,主要从事猪繁殖与呼吸综合征病毒和猪流行性腹泻病毒等病毒的病毒学和免疫学研究,E-mail:
董婉玉,主要从事猪冠状病毒入侵及复制机理研究,E-mail:
何海健,主要从事动物疫病防控技术研究,E-mail:
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杨帆,主要从事猪流行性腹泻病毒复制机制研究,E-mail:

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杨帆,主要从事猪流行性腹泻病毒复制机制研究,E-mail:

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diarrhea in suckling piglets,China[J].Emerg Infect Dis,2012,18(1):161-163., articleTitle=null, refAbstract=null), Reference(id=1307282450992886184, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[11], rfOrder=12, authorNames=null, journalName=null, refType=null, unstructuredReference=SONG X,LI Y,WANG C,et al.Efficacy evaluation of a bivalent subunit vaccine against epidemic PEDV heterologous strains with low cross-protection[J].J Virol,2024,98(10):e0130924., articleTitle=null, refAbstract=null), Reference(id=1307282451076772265, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[12], rfOrder=13, authorNames=null, journalName=null, 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Reference(id=1307282451538145711, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[17], rfOrder=19, authorNames=null, journalName=null, refType=null, unstructuredReference=丁小燕,张海涛,尹丽萍,等.猪流行性腹泻病毒变异株传代致弱株的免疫效率研究[J].中国预防兽医学报,2024,46(11):1159-1165., articleTitle=null, refAbstract=null), Reference(id=1307282451630420400, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[17], rfOrder=20, authorNames=null, journalName=null, refType=null, unstructuredReference=DING X Y,ZHANG H T,YIN L P,et al.Study on the immune efficiency of porcine epidemic diarrhea virus attenuation strain by serial passage[J].Chinese Journal of Preventive Veterinary Medicine,2024,46(11):1159-1165.(in Chinese), articleTitle=null, refAbstract=null), Reference(id=1307282451731083697, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[18], rfOrder=21, authorNames=null, journalName=null, refType=null, unstructuredReference=HOFMANN M,WYLER R.Propagation of the virus of porcine epidemic diarrhea in cell culture[J].J Clin Microbiol,1988,26(11):2235-2239., articleTitle=null, refAbstract=null), Reference(id=1307282451793998258, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[19], rfOrder=22, authorNames=null, journalName=null, refType=null, unstructuredReference=BAEK P S,CHOI H W,LEE S,et al.Efficacy of an inactivated genotype 2b porcine epidemic diarrhea virus vaccine in neonatal piglets[J].Vet Immunol Immunopathol,2016,174:45-49., articleTitle=null, refAbstract=null), Reference(id=1307282451903050163, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[20], rfOrder=23, authorNames=null, journalName=null, refType=null, unstructuredReference=LIN C M,HOU Y,MARTHALER DG,et al.Attenuation of an original US porcine epidemic diarrhea virus strain PC22A via serial cell culture passage[J].Vet Microbiol,2017,201:62-71., articleTitle=null, refAbstract=null), Reference(id=1307282451982741940, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[21], rfOrder=24, authorNames=null, journalName=null, refType=null, unstructuredReference=PENG O,WU Y,HU F,et al.Transcriptome profiling of Vero E6 cells during original parental or cell-attenuated porcine epidemic diarrhea virus infection[J].Viruses,2023,15(7):1426., articleTitle=null, refAbstract=null), Reference(id=1307282452108571061, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=[22], rfOrder=25, authorNames=null, journalName=null, refType=null, unstructuredReference=WU Y,LI W,ZHOU Q,et al.Characterization and pathogenicity of Vero cell-attenuated porcine epidemic diarrhea virus CT strain[J].Virol J,2019,16(1):121., articleTitle=null, refAbstract=null)], funds=[Fund(id=1307282447889101207, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, awardId=LY23C180003, 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articleId=1307013140584100842, companyId=1307282439353692494, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2.金华职业技术大学农学院,金华 321017)])], figs=[ArticleFig(id=1307282445791949185, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.1, caption=Amplification results of the PEDV N gene fragment, figureFileSmall=ZgPNEu0tB+FIV4wPM2JVmA==, figureFileBig=5NhxoyVD8xi/33XdOqOJtA==, tableContent=null), ArticleFig(id=1307282445909389698, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图1, caption=PEDV N基因片段扩增结果, figureFileSmall=ZgPNEu0tB+FIV4wPM2JVmA==, figureFileBig=5NhxoyVD8xi/33XdOqOJtA==, tableContent=null), ArticleFig(id=1307282446022635907, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.2, caption=Cytopathic effects (CPE) in Vero cells infected with YJH/2017/F25 or YJH/2017/F141, figureFileSmall=SFkIODkpUU5XU0vD+eLaAg==, figureFileBig=hygLPuPwUR22bxjXpM4oRg==, tableContent=null), ArticleFig(id=1307282446098133380, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图2, caption=YJH/2017/F25、YJH/2017/F141感染Vero细胞的CPE结果, figureFileSmall=SFkIODkpUU5XU0vD+eLaAg==, figureFileBig=hygLPuPwUR22bxjXpM4oRg==, tableContent=null), ArticleFig(id=1307282446194602373, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.3, caption=Phylogenetic tree of the PEDV S gene, figureFileSmall=kBdU+y6Cu3GXLV4bvkeuZw==, figureFileBig=QGcamUrm3KDgdn2Joe4QUg==, tableContent=null), ArticleFig(id=1307282446261711238, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图3, caption=PEDV S基因系统发育树, figureFileSmall=kBdU+y6Cu3GXLV4bvkeuZw==, figureFileBig=QGcamUrm3KDgdn2Joe4QUg==, tableContent=null), ArticleFig(id=1307282446345597319, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.4, caption=Multi-Step Growth Curves of YJH/2017/F141 and YJH/2017/F25

***.P<0.001, extremely significant difference

, figureFileSmall=ks4YV+66zP5y3nTl74MIOQ==, figureFileBig=6s14W9TX0mB+xXEgXV1GFg==, tableContent=null), ArticleFig(id=1307282446425289096, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图4, caption=YJH/2017/F141、YJH/2017/F25多步生长曲线

***. P<0.001,数据间有极显著差异

, figureFileSmall=ks4YV+66zP5y3nTl74MIOQ==, figureFileBig=6s14W9TX0mB+xXEgXV1GFg==, tableContent=null), ArticleFig(id=1307282446509175177, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.5, caption=Plaque Morphology of YJH/2017/F141 and YJH/2017/F25, figureFileSmall=6WsUtHJhS9se1L8qp0I/og==, figureFileBig=HZQVnWFrjJXIwNDfXxGbng==, tableContent=null), ArticleFig(id=1307282446593061258, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图5, caption=YJH/2017/F141、YJH/2017/F25噬斑形态, figureFileSmall=6WsUtHJhS9se1L8qp0I/og==, figureFileBig=HZQVnWFrjJXIwNDfXxGbng==, tableContent=null), ArticleFig(id=1307282446672753035, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.6, caption=Viral shedding in anal swabs and Intestinal autopsy lesions

A. Viral load detection in anal swabs by RT-qPCR; B. Results from intestinal postmortem examination in piglets

, figureFileSmall=AEgzvYN3nVYZgJ00FwRCog==, figureFileBig=obd0wH0OYy4fqNgcd2Sv0g==, tableContent=null), ArticleFig(id=1307282446773416332, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图6, caption=肛拭子排毒量检测及肠道剖检变化

A. RT-qPCR检测肛拭子病毒载量;B.仔猪肠道剖检结果

, figureFileSmall=AEgzvYN3nVYZgJ00FwRCog==, figureFileBig=obd0wH0OYy4fqNgcd2Sv0g==, tableContent=null), ArticleFig(id=1307282446882468237, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Fig.7, caption=HE staining and immunohistochemical analysis of intestinal tissue

A. Hematoxylin and eosin (HE) staining of intestinal tissue; B. Immunohistochemical analysis of intestinal tissue

, figureFileSmall=WiaJAiycKh2JN5TS2B0wig==, figureFileBig=AdBMpnxqL9sFPKmEujicrA==, tableContent=null), ArticleFig(id=1307282446983131534, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=图7, caption=肠道组织HE染色及免疫组化结果

A.肠道组织苏木精-伊红(HE)染色;B.肠道组织免疫组化分析

, figureFileSmall=WiaJAiycKh2JN5TS2B0wig==, figureFileBig=AdBMpnxqL9sFPKmEujicrA==, tableContent=null), ArticleFig(id=1307282447075406223, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Table 1, caption=

Primer information

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV-FGGGTTCCCTAAGGGTTGGAGGGTTC124
PEDV-RCCACTTGAAGGTGTTACGGACGTTTCTT
TGEV-FGGGTTCCCTAAGGGTTGGAGGGTTC138
TGEV-RCACGTGGTCGTTCCAATTCCCGTGGTCG
PDCoV-FGGGTTCCCTAAGGGTTGGAGG117
PDCoV-RCTGGCTGCGTTACACCAGACAAA
PoRV-FGGGTTCCCTAAGGGTTGGAGGGTTCC131
PoRV-RTAATAATTACTATCGGCGCTGC
), ArticleFig(id=1307282447197041040, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=表1, caption=

引物信息

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV-FGGGTTCCCTAAGGGTTGGAGGGTTC124
PEDV-RCCACTTGAAGGTGTTACGGACGTTTCTT
TGEV-FGGGTTCCCTAAGGGTTGGAGGGTTC138
TGEV-RCACGTGGTCGTTCCAATTCCCGTGGTCG
PDCoV-FGGGTTCCCTAAGGGTTGGAGG117
PDCoV-RCTGGCTGCGTTACACCAGACAAA
PoRV-FGGGTTCCCTAAGGGTTGGAGGGTTCC131
PoRV-RTAATAATTACTATCGGCGCTGC
), ArticleFig(id=1307282447310287249, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Table 2, caption=

Primer information for whole genome sequencing

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV Complete-01-FGATTTTCTATCTACGGATAGTTAG2 043
PEDV Complete-01-RGCAACACTAGCGGCCACAGGCA
PEDV Complete-1951-FCACCACTGGTCGTACAGTTG2 347
PEDV Complete-1951-RAATGGCCTTTGCTATGCC
PEDV Complete-4061-FTGATGGTGATGCTAATTATG3 286
PEDV Complete-4061-RGTCGTCATCAGATAAAGT
PEDV Complete-6934-FAATCCTTCTACGTACATGC3 541
PEDV Complete-6934-RAAATGCTCTGCCAAATAGT
PEDV Complete-10245-FTCTGACTTTCTTTTGGTC2 966
PEDV Complete-10245-RTCCTGATTATCTAATGTGAC
PEDV Complete-12959-FGTGTTACGCTTTACGTAAC3 368
PEDV Complete-12959-RAATCGACCGCTGCATGAG
PEDV Complete-16116-FTATTCCACTATACATAAGTTG2 279
PEDV Complete-16116-RCCATTACAACCCTCCAAG
PEDV Complete-17938-FATGAGCATTGTAATGTACAT2 697
PEDV Complete-17938-RTTACGTTGACCAAATGAT
PEDV S1-20480-FAGCAAGTTCAATTGTAAGCAT2 151
PEDV S1-20480-RCAACACAGAAAGAACTAAAC
PEDV S2-22039-FCTCAAGTGTTCTCAGGT2 951
PEDV S2-22039-RGCGCCTCAAAGAAGAC
PEDV ORF3-24687-FACGGGTTGTTGTGGATGC1 910
PEDV ORF3-24687-RCAATTGGAAGGTTGTTCA
PEDV Complete-26132-FTAGTGGTACATTGCTTGTAG1 909
PEDV Complete-26132-RTATCCATATCAACACCGTC
), ArticleFig(id=1307282447423533458, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=表2, caption=

全基因组测序引物信息

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV Complete-01-FGATTTTCTATCTACGGATAGTTAG2 043
PEDV Complete-01-RGCAACACTAGCGGCCACAGGCA
PEDV Complete-1951-FCACCACTGGTCGTACAGTTG2 347
PEDV Complete-1951-RAATGGCCTTTGCTATGCC
PEDV Complete-4061-FTGATGGTGATGCTAATTATG3 286
PEDV Complete-4061-RGTCGTCATCAGATAAAGT
PEDV Complete-6934-FAATCCTTCTACGTACATGC3 541
PEDV Complete-6934-RAAATGCTCTGCCAAATAGT
PEDV Complete-10245-FTCTGACTTTCTTTTGGTC2 966
PEDV Complete-10245-RTCCTGATTATCTAATGTGAC
PEDV Complete-12959-FGTGTTACGCTTTACGTAAC3 368
PEDV Complete-12959-RAATCGACCGCTGCATGAG
PEDV Complete-16116-FTATTCCACTATACATAAGTTG2 279
PEDV Complete-16116-RCCATTACAACCCTCCAAG
PEDV Complete-17938-FATGAGCATTGTAATGTACAT2 697
PEDV Complete-17938-RTTACGTTGACCAAATGAT
PEDV S1-20480-FAGCAAGTTCAATTGTAAGCAT2 151
PEDV S1-20480-RCAACACAGAAAGAACTAAAC
PEDV S2-22039-FCTCAAGTGTTCTCAGGT2 951
PEDV S2-22039-RGCGCCTCAAAGAAGAC
PEDV ORF3-24687-FACGGGTTGTTGTGGATGC1 910
PEDV ORF3-24687-RCAATTGGAAGGTTGTTCA
PEDV Complete-26132-FTAGTGGTACATTGCTTGTAG1 909
PEDV Complete-26132-RTATCCATATCAACACCGTC
), ArticleFig(id=1307282447499030931, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Table 3, caption=

Primer information for absolute quantitative qPCR

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV-N-FACTAATAAAGGAAATAAGGACCAG207
PEDV-N-RGTTAGTGGGTTCAGTCTTTGC
), ArticleFig(id=1307282447570334100, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=表3, caption=

绝对定量qPCR引物信息

, figureFileSmall=null, figureFileBig=null, tableContent=

引物名称

Primer name

引物序列(5′→3′)

Primer sequences

长度/bp

Length

PEDV-N-FACTAATAAAGGAAATAAGGACCAG207
PEDV-N-RGTTAGTGGGTTCAGTCTTTGC
), ArticleFig(id=1307282447641637269, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=EN, label=Table 4, caption=

Amino acid difference sites between YJH/2017/F25 and YJH/2017/F141

, figureFileSmall=null, figureFileBig=null, tableContent=
开放阅读框ORFs

编码蛋白(氨基酸数/aa)

Encoding protein (aa)

aa位置(aa)

aa position(aa)

氨基酸突变(YJH25→YJH141)

Amino acid mutation

ORF1aNsp3(1 621)1 563T→K
ORF2S(1 386)S1(792)27S→L
55,56I,G→缺失
57E→K
258N→H
286A→T
383T→I
389A→G
S2(594)801N→T
887S→R
961M→I
1 020A→T
1 250R→K
1 378E→TAA(STOP)
ORF3ORF3(224)146I→V
ORF4E(76)42H→Y
M(226)208A→V
), ArticleFig(id=1307282447725523350, tenantId=1146029695717560320, journalId=1306274286668972124, articleId=1307013140584100842, language=CN, label=表4, caption=

YJH/2017/F25与YJH/2017/F141氨基酸差异位点

, figureFileSmall=null, figureFileBig=null, tableContent=
开放阅读框ORFs

编码蛋白(氨基酸数/aa)

Encoding protein (aa)

aa位置(aa)

aa position(aa)

氨基酸突变(YJH25→YJH141)

Amino acid mutation

ORF1aNsp3(1 621)1 563T→K
ORF2S(1 386)S1(792)27S→L
55,56I,G→缺失
57E→K
258N→H
286A→T
383T→I
389A→G
S2(594)801N→T
887S→R
961M→I
1 020A→T
1 250R→K
1 378E→TAA(STOP)
ORF3ORF3(224)146I→V
ORF4E(76)42H→Y
M(226)208A→V
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一株猪流行性腹泻病毒G2b亚型细胞适应性毒株的复制特性及致病性
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杨帆 1 , 胡国芳 1 , 魏子文 1 , 周莹珊 1 , 宋厚辉 1 , 何海健 2 , 董婉玉 1 , 王晓杜 1
畜牧兽医学报 | 预防兽医 2026,57(2): 955-964
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畜牧兽医学报 |预防兽医 2026 , 57 (2) : 955 -964
一株猪流行性腹泻病毒G2b亚型细胞适应性毒株的复制特性及致病性
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杨帆1 , 胡国芳1, 魏子文1, 周莹珊1, 宋厚辉1, 何海健2 , 董婉玉1 , 王晓杜1
作者信息
  • 1.浙江农林大学动物医学院,浙江省畜禽绿色生态健康养殖应用技术研究重点实验室/动物健康互联网检测技术浙江省工程研究中心/浙江省动物医学与健康管理国际科技合作基地/同一健康和食品安全“一带一路”国际联合实验室/中澳动物健康大数据分析联合实验室,杭州 311300
  • 2.金华职业技术大学农学院,金华 321017
通讯作者:
王晓杜,主要从事猪繁殖与呼吸综合征病毒和猪流行性腹泻病毒等病毒的病毒学和免疫学研究,E-mail:
董婉玉,主要从事猪冠状病毒入侵及复制机理研究,E-mail:
何海健,主要从事动物疫病防控技术研究,E-mail:
作者简介:

杨帆,主要从事猪流行性腹泻病毒复制机制研究,E-mail:

Replication Characteristics and Pathogenicity of a Cell-Adapted Porcine Epidemic Diarrhea Virus G2b Strain
Fan YANG1 , Guofang HU1, Ziwen WEI1, Yingshan ZHOU1, Houhui SONG1, Haijian HE2 , Wanyu DONG1 , Xiaodu WANG1
Affiliations
  • 1.Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province,Zhejiang Engineering Research Center for Veterinary Diagnostics & Advanced Technology,Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management,“Belt and Road” International Joint Laboratory for One Health and Food Safety,China-Australia Joint Laboratory for Animal Health Big Data Analytics,College of Veterinary Medicine of Zhejiang A&F University,Hangzhou 311300,China
  • 2.College of Agriculture,Jinhua University of Vocational Technology,Jinhua 321017,China
  • Corresponding Author:
    WANG Xiaodu, E-mail:
    DONG Wanyu, E-mail:
    HE Haijian, E-mail:
出版时间: 2026-02-23 doi: 10.11843/j.issn.0366-6964.2026.02.032
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旨在探究猪流行性腹泻病毒(PEDV)流行株细胞适应后的复制特性及致病性,本研究将分离自某规模化猪场的PEDV流行毒株在Vero细胞中连续传代至不同代次,分别评价该毒株在细胞上的生物学特性,并将第25代和第141代病毒接种至3日龄仔猪,以比较其致病性差异。结果表明:临床病料接种液盲传至第4代时,在Vero细胞上形成PEDV典型合胞体病变;传代至25代时,细胞病变形态与病毒滴度趋于稳定;传代至141代时,病毒滴度显著提高,并诱发更快速的细胞病变效应。间接免疫荧光试验(IFA)可特异性检出PEDV N蛋白表达,序列分析表明该毒株为G2b型。仔猪攻毒试验表明,与亲本低代次毒株(YJH/2017/F25)相比,YJH/2017/F141接种组未出现明显临床症状或组织病理损伤,且肛拭子病毒排放量显著减少,各项指标与DMEM对照组无显著差异,该毒株的致病性较低而具有较好安全性。以上结果说明该流行毒株在体外连续传代后获得了更好的细胞适应性且对新生仔猪的致病性降低,本研究为PEDV弱毒疫苗研发提供新的候选毒株,其全基因组序列和生物学特征也为后续重组病毒研究奠定了基础。

猪流行性腹泻病毒  /  G2b型  /  细胞适应毒株  /  生物学特性

The aim of this study was to investigate the replication characteristics and pathogenicity of a cell-adapted strain derived from a prevalent PEDV isolate. The viral strain isolated from a large-scale pig farm was serially passaged in Vero cells to different generations. The biological characteristics of the virus were evaluated in vitro, and the 25th (F25) and 141st (F141) passages were inoculated into 3-day-old piglets to compare their pathogenic differences. The results showed that typical syncytial cytopathic effects (CPE) caused by PEDV were observed in Vero cells at the 4th blind passage of the clinical inoculum. By the 25th passage, both the CPE morphology and viral titers had stabilized. Upon reaching the 141st passage, the viral titer increased significantly and induced a more rapid cytopathic effect. Indirect immunofluorescence assay (IFA) specifically detected the expression of the PEDV N protein, and genomic sequence analysis identified the strain as genotype G2b. Pig challenge experiments demonstrated that, compared with the low-passage parental strain (YJH/2017/F25), the YJH/2017/F141-inoculated group showed no significant clinical symptoms or histopathological lesions, along with a significant reduction in viral shedding via anal swabs. All assessed parameters showed no significant difference from those of the DMEM control group, indicating reduced pathogenicity and favorable safety profile of the strain. These findings indicate that after serial in vitro passaging, the prevalent PEDV strain acquired enhanced cell adaptability while exhibiting decreased pathogenicity in neonates. This study provides a promising candidate strain for the development of an attenuated PEDV vaccine, and its complete genomic sequence and biological characteristics establish a foundation for further research on recombinant viruses.

porcine epidemic diarrhea virus  /  G2b genotype  /  cell-adapted strain  /  biological characteristics
杨帆, 胡国芳, 魏子文, 周莹珊, 宋厚辉, 何海健, 董婉玉, 王晓杜. 一株猪流行性腹泻病毒G2b亚型细胞适应性毒株的复制特性及致病性. 畜牧兽医学报, 2026 , 57 (2) : 955 -964 . DOI: 10.11843/j.issn.0366-6964.2026.02.032
Fan YANG, Guofang HU, Ziwen WEI, Yingshan ZHOU, Houhui SONG, Haijian HE, Wanyu DONG, Xiaodu WANG. Replication Characteristics and Pathogenicity of a Cell-Adapted Porcine Epidemic Diarrhea Virus G2b Strain[J]. Acta Veterinaria et Zootechnica Sinica, 2026 , 57 (2) : 955 -964 . DOI: 10.11843/j.issn.0366-6964.2026.02.032
猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)是一种猪肠道致病性冠状病毒,是冠状病毒科的重要成员,具有约28 kb长的单链正义RNA基因组[1]。PEDV可导致3~10日龄仔猪出现严重的水样腹泻和脱水,致死率可高达100%[2]。PEDV于20世纪70年代首次在英国发现,并迅速传播至全球各地,给养猪业带来了巨大的经济损失[3]。当前,PEDV是导致我国猪群病毒性腹泻的主要病原体,检出率大于40%,其流行率显著高于其他相关病毒[4]。
PEDV在疫苗的免疫压力下不断变异,不同地区流行的毒株基因型差异大,甚至同一个场可能同时感染两种以上基因型。PEDV分为G1和G2两种基因型[5],其中G2型毒株又分为G2a、G2b和G2c三个亚型,2010年后出现的G2亚型是目前流行的主要毒株类型[4,6⁃7],G2基因型毒株的毒力显著高于G1基因型毒株。此外,G2b毒株在我国部分区域呈现较高流行趋势[8]。
疫苗接种是防控PEDV的主要策略之一[9]。目前,预防猪流行性腹泻(porcine epidemic diarrhea,PED)的疫苗种类繁多,包括灭活疫苗、减毒活疫苗、核酸疫苗和基因工程疫苗等,其中应用最多的疫苗仍为弱毒疫苗[1]。与早期的G1基因型相比,G2b毒株在S基因等关键抗原位点上存在大量突变,导致其抗原性发生显著变化,这些突变使得G2b毒株能够有效逃逸基于CV777、DR13和KPEDV-9等G1基因型疫苗[10]及G2a基因型疫苗[11]诱导的免疫反应。这也是导致现有疫苗保护效力减弱的关键因素之一[7]。因此,分离PEDV流行毒株并基于流行毒株研发新疫苗已成为当前亟待解决的问题。基于以上,本研究将一株G2b亚群流行毒株连续传代至141代,评价其在细胞和靶动物上的生物学特性,为PEDV流行毒株疫苗的研发提供新的候选毒株。
在某规模化养殖场中采集的腹泻仔猪肠道组织,经RT-PCR检测TGEV(transmissible gastro enteritis virus, TGEV)、PDCoV(porcine deltacoronavirus, PDCoV)、PoRV(porcine rotavirus, PoRV)和SADS-CoV(swine acute diarrhea syndrome coronavirus)均为阴性,PEDV为阳性。用含有青链霉素(100 U·mL-1,100 μg·mL-1)和胰酶(5 mg·L-1)的维持液匀浆该PEDV阳性样本,4 ℃ 12 000 r·min-1离心取上清液,用0.22 μm滤器过滤后,置于-80 ℃备用;非洲绿猴肾细胞(Vero-E6)细胞购自上海细胞库(编号:CBP60972)。
2×Phanta Flash Master Mix (Dye Plus)、ReverTra Ace-α-®长片段反转录试剂盒,购自东洋纺(上海)生物科技有限公司;HiScript III All-in-one RT SuperMix Perfect for qPCR、2×Taq Pro Universal SYBR qPCR Master Mix,购自南京诺唯赞生物科技股份有限公司;PEDV-N蛋白单克隆抗体,为实验室自制;荧光标记二抗,购自英潍捷基(上海)贸易有限公司;引物合成及测序服务均由浙江有康生物科技有限公司提供。
6头1日龄未吃初乳的健康仔猪购自浙江省某猪场,攻毒前采集直肠拭子,并提取直肠拭子RNA,反转录后通过RT-qPCR检测PEDV、TGEV、PDCoV和PoRV [12],检测结果显示均呈阴性,引物信息见表1。此外,仔猪粪便及精神状态在攻毒前均无异常。
取处理好的样品上清与病毒维持液(胰酶终浓度为5 mg·L-1的DMEM培养基)按照1∶1接种至汇合度80%~90%的6孔板Vero细胞中,37 ℃、5% CO2恒温培养箱中吸附2 h,弃上清后加入含有胰酶的维持液,放置在37 ℃细胞培养箱中培养,48 h后于-80 ℃冻融三次后收上清,按照此步骤继续接种至6孔板中,连续传代直至出现典型合胞体病变。将分离出的病毒进行两轮噬斑纯化,纯化后的病毒命名为PEDV YJH/2017(“YJH”代表毒株分离地,“2017”指毒株样本采集的年份),继续进行传代培养。从第70代开始,每10代次进行1轮噬斑纯化,挑取单斑扩增后用于后续传代。将传至25代的病毒和141代的病毒分别命名为YJH/2017/F25、YJH/2017/F141,并于-80 ℃保存。
将Vero细胞铺至96孔细胞培养板,于37 ℃ 5% CO2恒温培养箱培养12~16 h,待细胞汇合度达到80%~90%后弃去培养上清,PBS清洗1次,含胰酶(5 mg·L-1)的维持液清洗1次。随后将经噬斑纯化后的PEDV YJH25与PEDV YJH141按照10-1~10-6稀释比例稀释,将稀释后的病毒液接种至96孔板的Vero细胞中,检测病毒的TCID50,计算病毒滴度。
取PEDV YJH/2017/F25及 YJH/2017/F141的病毒液,用Trizol法提取样品总RNA。按照反转录试剂盒说明书对样品进行反转录,取cDNA进行PCR检测,引物信息见表2,随后将扩增片段克隆至克隆载体,转化后挑取阳性质粒送浙江有康生物科技有限公司测序。
将Vero细胞铺至12孔细胞培养板,于37 ℃培养箱中培养12~16 h,待细胞汇合度达到80%~90%后弃去培养上清,PBS清洗1次,含胰酶(5 mg·L-1)的维持液清洗1次。随后以0.01MOI每孔的感染量将病毒接种12孔板的Vero细胞中,并于感染后12、18、24、36、48和60 h收取孔内的培养上清,每个时间点设置3个重复孔,检测病毒的TCID50,绘制病毒的生长曲线。
将Vero细胞铺于6孔板,置于37 ℃培养箱培养12~16 h,直至细胞汇合度达到80%~90%。将待测病毒液用病毒维持液于灭菌1.5 mL EP管中作10倍浓度梯度稀释,每个梯度三个重复。弃去6孔板中培养上清,PBS清洗2次,将稀释后的病毒液覆盖于单层Vero细胞,吸附2 h后,加入胰酶终浓度为5 µg·mL-1的2×DMEM与2%低熔点琼脂糖混合培养基。4 ℃静置10 min后放入培养箱倒置培养48 h。加入4%的多聚甲醛室温固定2 h,随后使用结晶紫染色,观察噬斑形态。
选取9头未吃初乳的3日龄健康仔猪,随机均分到PEDV YJH25攻毒组、PEDV YJH141攻毒组和DMEM对照组,各组仔猪独立隔离饲养,饲喂商品代乳粉(无菌),每6 h一次。攻毒前,仔猪接受1 d的适应性饲养以缓解应激。随后,攻毒组仔猪(现为3日龄)每头灌服2×105 TCID50的病毒液,对照组灌服等体积的DMEM培养基。攻毒后每12 h观察仔猪的粪便情况及精神状态,并按照以下评分标准进行打分,粪便状态:正常“0”,软便“1”,软便夹杂水样稀粪“2”,水样腹泻“3”。精神状态:良好“0”,嗜睡“1”,沉郁“2”。
攻毒后每12 h采集一次肛拭子,并将肛拭子加入至1 mL的PBS中,充分震荡混匀、4 ℃离心收取上清液,于-80 ℃保存;取300 μL上清液提取总RNA,取1 µg RNA进行反转录获得cDNA。采用绝对荧光定量PCR检测样品中的病毒拷贝数。引物信息见表3。
攻毒第7天对未死亡的仔猪进行安乐死。剖检时拍照肠道大体照片,并采集攻毒仔猪的空肠及回肠组织,用4%多聚甲醛固定36 h,常规制备石蜡切片,随后进行HE染色及免疫组化检测,在光学显微镜下观察。
将PEDV阳性病料接种Vero细胞,盲传至第4代时开始出现合胞体样典型病变,经RT-PCR检测为PEDV阳性(图1),随后将其传代至25代及141代并分别感染Vero细胞,与未感染的细胞相比,感染组细胞出现合胞体、细胞破裂和脱落等典型的病变(图2),且随着病毒代次的增加,病毒对Vero细胞的感染能力显著增强。分别将病毒的第25代与第141代接种Vero细胞,感染18 h后进行IFA检测,可观察到PEDV感染细胞呈现特异性绿色荧光(数据未显示),以上结果说明成功分离PEDV。
为了确定分离毒株的基因型,从病毒保守区域设计引物对YJH/2017/F25、YJH/2017/F141毒株的基因片段进行扩增和测序(引物信息见表2),随后对测序结果进行拼接,YJH/2017/F141序列已上传至GenBank数据库,登录号为OR596889.1。根据测序结果比对YJH/2017/F25、YJH/2017/F141的氨基酸序列差异,结果显示YJH25与YJH141共存在17处氨基酸位点的差异,分别位于非结构蛋白Nsp3,结构蛋白S、E、M以及辅助蛋白ORF3。其中有13处氨基酸位点突变位于结构蛋白中的S蛋白(表4)。随后通过最大似然法分析,对该毒株S基因组氨基酸序列进行系统发育树分析。结果显示该毒株属于毒力较高的G2b亚群(图3)。S基因相似性比对显示该毒株与国内流行株GD-B的相似性最高,为98.6%,与经典毒株CV777的相似性较低,仅为92.78%。
为探究分离毒株在Vero细胞上的生长特性,分别将YJH/2017/F25、YJH/2017/F141的病毒以0.01 MOI感染Vero细胞,绘制病毒的多步生长曲线。结果显示,YJH/2017/F141在24 h时病毒滴度达到峰值,在12~24 h时病毒迅速复制,滴度上升较快,最高滴度可达107.026 TCID50·mL-1。而YJH/2017/F25则于36 h左右病毒滴度达到峰值,最高滴度为104.27 TCID50·mL-1,病毒复制速率显著低于YJH/2017/F141(图4)。以上结果说明该毒株在连续传代过程中显著增强了其在Vero细胞中的适应性。
为评估分离毒株对Vero细胞的感染能力,分别以相同MOI的YJH/2017/F25和YJH/2017/F141毒株感染细胞,经结晶紫染色后观察噬斑形态,试验结果显示,YJH/2017/F141的噬斑明显大于YJH/2017/F25(图5),说明YJH/2017/F141在Vero细胞上的适应性强于YJH/2017/F25。以上结果说明在该毒株连续传代后在Vero细胞上产生病变的能力增强。
为评估YJH/2017/F141对仔猪的致病力,将2×105TCID50剂量的YJH/2017/F141、YJH/2017/F25病毒液口服接种3日龄仔猪,并设置DMEM对照组。结果显示在攻毒后,YJH/2017/F141攻毒组仔猪粪便状态与精神状态均正常,未出现任何症状,与DMEM对照组一致,在肛拭子中未检测到明显排毒;而YJH/2017/F25攻毒组仔猪出现腹泻及精神萎靡,在肛拭子中可以检测到明显排毒(图6A)。对仔猪进行剖检,剖检结果显示YJH/2017/F141攻毒组仔猪小肠外观正常,与对照组基本一致,YJH/2017/F25攻毒组仔猪肠组织充血变薄(图6B)。以上结果表明YJH/2017/F141毒株对新生仔猪没有致病性。采集仔猪肠道组织进行肠组织切片检查。结果显示YJH/2017/F141攻毒组仔猪未见严重的肠绒毛损伤,小肠绒毛结构基本完整,与DMEM对照组一致,YJH/2017/F25攻毒组仔猪可见小肠绒毛萎缩、脱落(图7A)。免疫组化染色结果显示,YJH/2017/F141攻毒组仔猪未在小肠上皮细胞中检测到PEDV-N抗原,与DMEM对照组一致,YJH/2017/F25攻毒组仔猪在小肠绒毛上可检测到大量PEDV抗原(图7B),说明YJH/2017/F141对新生仔猪基本没有致病性。
近年来,PED在全球养殖场的流行率、传播范围、发病率和死亡率显著上升,对养殖行业造成了严重经济损失[13]。PEDV的高变异性是其传播能力和毒力增强的关键因素[14]。研究表明,PEDV基因组中的频繁突变,尤其是S基因等关键抗原位点的变异,导致了不同毒株之间的遗传多样性,这种变异不仅使得PEDV能够在宿主免疫系统的压力下生存,还导致了流行毒株的免疫逃逸现象[14]。特别是自2010年G2b亚型毒株出现以来,该亚型在PEDV的流行株中逐渐占据主导地位,其与早期G1基因型相比,表现出更强的传播能力和毒力差异,使得传统毒株研发的疫苗保护效果受到质疑[15]。
疫苗接种仍是目前防控猪流行性腹泻的主要手段[16],现有疫苗类型主要包括灭活疫苗、弱毒疫苗、基因工程疫苗等。其中减毒活疫苗临床应用多,它将病毒的致病力降低但仍保留其复制能力,免疫效果更持久,且无需任何佐剂,成本效益高,但是对安全性要求高,毒株选择要求严格。目前,国内防控PEDV流行株的弱毒活疫苗主要通过将流行毒株体外连续传代致弱后,筛选免疫效果和细胞适应性最佳的毒株制备[17]。尽管毒株分离是疫苗开发的关键步骤,但PEDV的临床分离却极具挑战性[18]。以常用的Vero细胞为例,当前的分离率不足40%,而且成功分离的毒株通常滴度较低[16,19]。PEDV体外分离效率低下是严重制约疫苗的研发速度的重要原因。本研究从浙江某规模化养殖场收集阳性病料,分离病毒。在Vero细胞上成功分离到YJH/2017毒株,并对其全基因组测序,并从S基因水平分析其与其他经典PEDV毒株和流行PEDV毒株之间的系统发育关系,分析结果显示该毒株属于G2b亚型,是近年来我国部分地区常见的流行毒株之一。
Lin等[20]研究发现,体外连续传代可以显著增加病毒的细胞适应性,并提高滴度,Peng等[21]在文章中也提到了相同的结论。为了研究YJH/2017是否适合作为弱毒疫苗载体,将其在Vero细胞上连续传代至第141代,得到YJH/2017/F141病毒。在对YJH/2017/F141的生物学特性的研究中,发现其在连续传代的过程中,对Vero细胞的适应性增强,病毒滴度升高,这与Lin等[20]、Peng等[21]的研究结果一致。致病性试验结果表明3日龄的仔猪感染YJH/2017/F141毒株后没有症状出现,说明体外连续传代后的高代次毒株对仔猪没有致病性,这与Wu等[22]发现的P120代次的毒株相对于P64、P10代毒株可以显著减少仔猪的临床症状、组织病理病变和肠道PEDV抗原分布的研究结果一致。
本研究成功分离并纯化出一株PEDV毒株(YJH/2017),经S基因序列分析,该毒株属于G2b型。在Vero细胞上的连续传代使其获得了显著的细胞适应性,病毒滴度显著提高且细胞病变效应加速。同时,仔猪攻毒试验结果表明,传至141代的YJH/2017/F141对3日龄仔猪的致病力明显减弱,未引起显著的临床症状和组织病理损伤,且病毒排放量显著降低,表现出优异的生物安全性。该研究结果为PEDV疫苗的研制奠定了基础,并为后续PEDV G2b流行毒株弱毒疫苗及灭活疫苗的研发提供了一株新的候选毒株。
  • 浙江省自然科学基金项目(LY23C180003)
  • 浙江省领雁计划项目(2023C02023)
  • 浙江省领雁计划项目(2023C02022)
  • 浙江省自然科学基金基础公益项目(LTGN24C180001)
  • 金华市科技计划项目(2023-2-022)
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2026年第57卷第2期
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doi: 10.11843/j.issn.0366-6964.2026.02.032
  • 接收时间:2025-06-03
  • 首发时间:2026-09-16
  • 出版时间:2026-02-23
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  • 收稿日期:2025-06-03
基金
浙江省自然科学基金项目(LY23C180003)
浙江省领雁计划项目(2023C02023)
浙江省领雁计划项目(2023C02022)
浙江省自然科学基金基础公益项目(LTGN24C180001)
金华市科技计划项目(2023-2-022)
作者信息
    1.浙江农林大学动物医学院,浙江省畜禽绿色生态健康养殖应用技术研究重点实验室/动物健康互联网检测技术浙江省工程研究中心/浙江省动物医学与健康管理国际科技合作基地/同一健康和食品安全“一带一路”国际联合实验室/中澳动物健康大数据分析联合实验室,杭州 311300
    2.金华职业技术大学农学院,金华 321017

通讯作者:

王晓杜,主要从事猪繁殖与呼吸综合征病毒和猪流行性腹泻病毒等病毒的病毒学和免疫学研究,E-mail:
董婉玉,主要从事猪冠状病毒入侵及复制机理研究,E-mail:
何海健,主要从事动物疫病防控技术研究,E-mail:
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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