Onderstepoort Journal of Veterinary Research最新文献

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Th1 and Th2 epitopes of Cowdria polymorphic gene 1 of Ehrlichia ruminantium. 反刍埃利希体考德里亚多态性基因1的Th1和Th2表位。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2023-03-23 DOI: 10.4102/ojvr.v90i1.2070
Tlou A Ngoepe, Alri Pretorius, Helena C Steyn, Mirinda Van Kleef
{"title":"Th1 and Th2 epitopes of Cowdria polymorphic gene 1 of Ehrlichia ruminantium.","authors":"Tlou A Ngoepe,&nbsp;Alri Pretorius,&nbsp;Helena C Steyn,&nbsp;Mirinda Van Kleef","doi":"10.4102/ojvr.v90i1.2070","DOIUrl":"https://doi.org/10.4102/ojvr.v90i1.2070","url":null,"abstract":"<p><p>Cowdria polymorphic gene 1 (cpg1, Erum2510, ERUM_RS01380) has been shown to induce 30% and 100% protection in sheep immunised by deoxyribonucleic acid (DNA) prime combined with DNA boost and DNA prime combined with protein boost, respectively, against heartwater infection via needle challenge. To localise its antigenic regions for inclusion in a multi-epitope DNA vaccine against heartwater, Erum2510 was cleaved into five overlapping subfragments. These subfragments were expressed individually in an Escherichia coli host expression system and evaluated for their ability to induce proliferative responses, Th1 and Th2 cytokines (interferon gamma [IFN-γ] and interleukin 4 [IL-4]) via enzyme-linked immunospot (ELISpot), quantitative real time polymerase chain reaction (qRT-PCR) and flow cytometry. Recombinant (r)proteins 3 and 4 were shown to induce immunodominant Th1 and Th2 immune responses characterised by the secretion of effector cytokines IFN-γ and IL-4 in addition to differential messenger ribonucleic acid (mRNA) expression of tumour necrosis factor (TNF), IL-2, IL-1, IL-18, IL-10, transforming growth factor (TGF), granulocyte-macrophage colony-stimulating factor (GM-CSF) and inducible nitric oxide synthase (iNOS). Thirty-seven overlapping synthetic peptides (16 mer) spanning the lengths of these immunodominant rproteins were synthesised and assayed. A peptide pool comprising p9 and p10 derived from rprotein 3 induced a Th1-biased immune response. A peptide pool comprising p28 and p29 derived from rprotein 4 induced a mixed Th1 and Th2 immune response characterised by secretion of IFN-γ and differential mRNA expression of IL-1, IL-2, IL-10, IL-12, iNOS, TGF, TNF and GM-CSF. Only one of the peptides (p29) induced secretion of IL-4. Phenotypic analysis showed significant activation of cluster of differentiation 8+ (CD8+), cluster of differentiation 4+ (CD4+) and B+ lymphocyte populations. Findings suggest that Erum2510 rproteins and synthetic peptides can induce both cellular and humoral immune responses, thereby implicating their importance in protection against heartwater.Contribution: This study will facilitate the design of an effective multi-epitope DNA vaccine against heartwater that will contribute to control this economically important disease in sub-Saharan Africa and beyond.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"90 1","pages":"e1-e15"},"PeriodicalIF":2.7,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10091069/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9882999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Description of Culicoides truuskae sp. n. (Diptera: Ceratopogonidae) from southern Africa. 标题非洲南部库蠓记述(双翅目:蠓科)。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2023-03-06 DOI: 10.4102/ojvr.v90i1.2072
Karien Labuschagne, Rudolf Meiswinkel, Danica Liebenberg, Carissa Van Zyl, Antoinette Van Schalkwyk, Clarke Scholtz
{"title":"Description of Culicoides truuskae sp. n. (Diptera: Ceratopogonidae) from southern Africa.","authors":"Karien Labuschagne,&nbsp;Rudolf Meiswinkel,&nbsp;Danica Liebenberg,&nbsp;Carissa Van Zyl,&nbsp;Antoinette Van Schalkwyk,&nbsp;Clarke Scholtz","doi":"10.4102/ojvr.v90i1.2072","DOIUrl":"https://doi.org/10.4102/ojvr.v90i1.2072","url":null,"abstract":"<p><p>Culicoides truuskae Labuschagne and Meiswinkel sp. n. is described and illustrated in both sexes from material collected in South Africa and Namibia. It is restricted to the xeric western margin of the subcontinent, occurring in Fynbos, Nama-Karoo and Succulent Karoo ecoregions in South Africa and Desert and Savanna ecoregions in Namibia experiencing 600 mm of rainfall annually. Culicoides truuskae sp. n. is part of the Afrotropical 'plain-wing' Culicoides in which the wing lacks a distinguishing pattern of light and dark spots; the diagnostic dark smudge that traverses wing cell r3 may result in C. truuskae sp. n. being misidentified as the sympatric but phyletically unrelated Culicoides herero (Enderlein) - (of the Similis group, subgenus Oecacta Poey). Additionally, this study is the first description of the male of C. herero. C. truuskae sp. n. and Culicoides coarctatus Clastrier and Wirth share similar characters in the male genitalia, although the two species are separable on wing pattern and female flagellum sensilla coeloconica (SCo) distribution. The breeding habitat and adult female blood-feeding preferences of C. truuskae sp. n. are not known. A maximum likelihood phylogenetic tree, using mitochondrial cytochrome c oxidase I (COI) sequence data, is provided to further clarify the relationship between C. truuskae sp. n., C. coarctatus and C. herero. Extensive light trap data, collected over 30 years, are used to map the distribution ranges of C. truuskae sp. n., C. coarctatus and C. herero in Southern Africa.Contribution: The description of this new species and the description of the male of C. herero increases our understanding of the diversity and distribution of Culicoides species in southern Africa.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"90 1","pages":"e1-e14"},"PeriodicalIF":2.7,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10091059/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9300472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Prevalence of peste des petits ruminants virus antibodies in sheep and goats sera from Central-Western Sudan. 苏丹中西部绵羊和山羊血清中小反刍兽疫病毒抗体的流行情况
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2023-02-28 DOI: 10.4102/ojvr.v90i1.2074
Safa E M Ali, Yassin A M Ahmed, Alwia A Osman, Omiema A Gamal Eldin, Nussieba A Osman
{"title":"Prevalence of peste des petits ruminants virus antibodies in sheep and goats sera from Central-Western Sudan.","authors":"Safa E M Ali,&nbsp;Yassin A M Ahmed,&nbsp;Alwia A Osman,&nbsp;Omiema A Gamal Eldin,&nbsp;Nussieba A Osman","doi":"10.4102/ojvr.v90i1.2074","DOIUrl":"https://doi.org/10.4102/ojvr.v90i1.2074","url":null,"abstract":"<p><p>Clinical signs suggestive of peste des petits ruminants (PPR) involved herds of small ruminants, which were described elsewhere in Sudan. Peste des petits ruminants was confirmed using an Immunocapture ELISA (IC-ELISA) assay in samples of infected and dead animals in areas of outbreaks. Therefore, to update information regarding the current situation and for assessment of the serological prevalence of PPR in small ruminants mingled at Central and Western Sudan during 2018-2019, 368 sera were collected from sheep (325 sera) and goats (43 sera) with different ages and breeds. These sera included 186 sera (173 sheep and 13 goats) from White Nile State and 182 sera (152 sheep and 30 goats) from Kordofan States. Competitive ELISA demonstrated higher prevalence of PPRV antibodies of 88.9%, 90.7% and 88.6% in both sheep and goats, goats, and sheep sera, respectively. Moreover, 100%, 94.7% and 78.5% seroprevalence values were demonstrated in South Kordofan, North Kordofan and White Nile States. The higher seroprevalence values detected in sera of unvaccinated sheep and goats indicated the wide exposure of these animals to PPRV and presence of protection following PPR viral infection. The findings of the study indicated that PPR is endemic in the surveyed areas of Sudan.Contribution: The study will contribute effectively to the global eradication programme of PPR organised by the World Organization for Animal Health (WOAH, formerly OIE) and Food and Agriculture Organization (FAO). To completely eliminate PPR from Sudan by 2030, local efforts should be directed towards effectively and wholly vaccinating small ruminants using PPRV vaccine especially in routes of seasonal animal's movement and shared grazing areas.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"90 1","pages":"e1-e8"},"PeriodicalIF":2.7,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9982513/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10837325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prevalence of bovine trypanosomiasis in Côte d'Ivoire: Systematic review and meta-analysis. 牛锥虫病在Côte科特迪瓦的流行:系统回顾和荟萃分析。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2023-02-27 DOI: 10.4102/ojvr.v90i1.2069
Jean-Yves Ekra, Edouard K N'Goran, Léonard E G Mboera, Eliakunda M Mafie
{"title":"Prevalence of bovine trypanosomiasis in Côte d'Ivoire: Systematic review and meta-analysis.","authors":"Jean-Yves Ekra,&nbsp;Edouard K N'Goran,&nbsp;Léonard E G Mboera,&nbsp;Eliakunda M Mafie","doi":"10.4102/ojvr.v90i1.2069","DOIUrl":"https://doi.org/10.4102/ojvr.v90i1.2069","url":null,"abstract":"<p><p>Bovine trypanosomiasis is a parasitic disease caused by protozoans of the genus Trypanosoma. The disease cause economic losses in livestock production. In order to determine the status of research on this disease in Côte d'Ivoire, we used the systematic review method and meta-analysis. Three electronics databases, namely Google Scholar, PubMed and CrossRef were used to search for publications on trypanosomiasis prevalence that met our inclusion criteria. Twenty five articles were identified, 11 of which met the inclusion criteria. Bovine trypanosomiasis prevalence of 2.99% (95% confidence interval [CI]: 2.96% - 3.01%) to 25.28% (95% CI: 25.17% - 25.38%) were recorded between 1960 and 2021. The analyses showed that the most infected regions were the Bagoue 11.26% (95% CI: 11.25% - 11.27%), Bounkani 14.94% (95% CI: 14.93% - 14.95%), Gbeke 10.34% (95% CI: 10.33% - 10.35%), Marahoue 13.79% (95% CI: 13.78% - 13.80%), Poro 8.50% (95% CI: 8.49% - 8.51%), and Tchologo 11.83% (95% CI: 11.82% - 11.84%).The most sensitive diagnostic method used was the polymerase chain reaction (PCR). The species of trypanosomes diagnosed were Typanosoma vivax 4.99% (95% CI: 4.97% - 5.01%), T. congolense 1.51% (95% CI: 1.49% - 1.52%), and T. brucei 0.61% (95% CI: 0.59% - 0.62%). Despite some variation, the prevalence of bovine trypanosomiasis in Côte d'Ivoire caused mainly by T. vivax has increased in the years between 1977 and 2017. Efforts to control tsetse and other mechanical vectors should also be put in place to minimize its transmission.Contribution: The authors studied the prevalence of bovine trypanosomiasis using the systematic review method and MA in order to determine the status of research on this disease in Côte d'Ivoire.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"90 1","pages":"e1-e8"},"PeriodicalIF":2.7,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9982491/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10837327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Approaches to increase recovery of bacterial and fungal abortion agents in domestic ruminants. 提高国内反刍动物细菌和真菌流产剂回收率的方法。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2023-01-11 DOI: 10.4102/ojvr.v90i1.2010
Annelize Jonker, Peter N Thompson, Anita L Michel
{"title":"Approaches to increase recovery of bacterial and fungal abortion agents in domestic ruminants.","authors":"Annelize Jonker,&nbsp;Peter N Thompson,&nbsp;Anita L Michel","doi":"10.4102/ojvr.v90i1.2010","DOIUrl":"https://doi.org/10.4102/ojvr.v90i1.2010","url":null,"abstract":"<p><p>Abortions in domestic ruminants cause significant economic losses to farmers. Determining the cause of an abortion is important for control efforts, but it can be challenging. All available diagnostic methods in the bacteriology laboratory should be employed in every case due to the many limiting factors (autolysis, lack of history, range of samples) that complicate the investigation process. The purpose of this study was to determine whether the recovery of diagnostically significant isolates from domestic ruminant abortion cases could be increased through the use of a combination of the existing aerobic culture and Brucella selective method with methods that are commonly recommended in the literature reporting abortion investigations. These methods are examination of wet preparations and impression smears stained by the modified Ziehl-Neelsen method, anaerobic, microaerophilic, Leptospira, Mycoplasma and fungal culture. Samples of placenta and aborted foetuses from 135 routine clinical abortion cases of cattle (n = 88), sheep (n = 25) and goats (n = 22) were analysed by the new combination of methods. In 46 cases, bacteria were identified as aetiological agents and in one case a fungus. Isolation of Brucella species increased to 7.4% over two years compared with the previous 10 years (7.3%), as well as Campylobacter jejuni (n = 2) and Rhizopus species (n = 1). Salmonella species (5.9%) and Trueperella pyogenes (4.4%) were also isolated more often. In conclusion, the approach was effective in removing test selection bias in the bacteriology laboratory. The importance of performing an in-depth study on the products of abortion by means of an extensive, combination of conventional culture methods was emphasised by increased isolation of Brucella abortus and isolation of C. jejuni. The combination of methods that yielded the most clinically relevant isolates was aerobic, microaerophilic, Brucella and fungal cultures.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"90 1","pages":"e1-e10"},"PeriodicalIF":2.7,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9900296/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9184817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Acknowledgement to reviewers. 感谢审稿人。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2022-12-19 DOI: 10.4102/ojvr.v89i1.2086
Editorial Office
{"title":"Acknowledgement to reviewers.","authors":"Editorial Office","doi":"10.4102/ojvr.v89i1.2086","DOIUrl":"https://doi.org/10.4102/ojvr.v89i1.2086","url":null,"abstract":"<p><p>No abstract available.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"89 1","pages":"2086"},"PeriodicalIF":2.7,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10475253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Propagation of avian influenza virus in embryonated ostrich eggs. 禽流感病毒在鸵鸟胚中的繁殖。
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2022-12-08 DOI: 10.4102/ojvr.v89i1.2011
Agnes T Laleye, Modupeore Adeyemi, Celia Abolnik
{"title":"Propagation of avian influenza virus in embryonated ostrich eggs.","authors":"Agnes T Laleye,&nbsp;Modupeore Adeyemi,&nbsp;Celia Abolnik","doi":"10.4102/ojvr.v89i1.2011","DOIUrl":"https://doi.org/10.4102/ojvr.v89i1.2011","url":null,"abstract":"<p><p>Influenza A viruses (IAVs) are typically isolated and cultured by successive passages using 9- to 11-day-old embryonated chicken eggs (ECEs) and in 14-day old ECEs for virus mutational studies. Real-time reverse transcription-polymerase chain reaction tests (RT-PCRs) are commonly used for IAV diagnosis, but virus isolation remains invaluable in terms of its high sensitivity, providing viable isolates for further studies and the ability to distinguish between viable and nonviable virus. Efforts at isolating ostrich-origin IAVs from RT-PCR positive specimens using ECEs have often been unsuccessful, raising the possibility of a species bottleneck, whereby ostrich-adapted IAVs may not readily infect and replicate in ECEs, yet the capacity of an ostrich embryo to support the replication of influenza viruses has not been previously demonstrated. This study describes an optimised method for H5 and H7 subtype IAV isolation and propagation in 28-day old embryonated ostrich eggs (EOEs), the biological equivalent of 14-day old ECEs. The viability of EOEs transported from breeding sites could be maximised by pre-incubating the eggs for 12 to 14 days prior to long-distance transportation. This method applied to studies for ostrich-adapted virus isolation and in ovo studies will enable better understanding of the virus-host interaction in ostriches and the emergence of potentially zoonotic diseases.</p>","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"89 1","pages":"e1-e6"},"PeriodicalIF":2.7,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9772752/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10795275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparing allele-specific expression in Sistani cattle and its crossbreds with Holstein, Simmental, and Montbeliarde Sistani牛及其与荷斯坦、西门塔尔和蒙贝利亚德杂交牛等位基因特异性表达的比较
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2022-11-25 DOI: 10.4102/ojvr.v89i1.2041
Rasoul Farzaneh Dizaj, M. Amin-Afshar, S. Esmaeilkhanian, Nasser Emamjomeh-Kashan, M. H. Banabazi
{"title":"Comparing allele-specific expression in Sistani cattle and its crossbreds with Holstein, Simmental, and Montbeliarde","authors":"Rasoul Farzaneh Dizaj, M. Amin-Afshar, S. Esmaeilkhanian, Nasser Emamjomeh-Kashan, M. H. Banabazi","doi":"10.4102/ojvr.v89i1.2041","DOIUrl":"https://doi.org/10.4102/ojvr.v89i1.2041","url":null,"abstract":"","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41795281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Serial in Vivo Passages on The Adaptation of H1N1 Avian Influenza Virus To Pigs 猪体内连续传代对H1N1禽流感病毒适应性的影响
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2022-03-01 DOI: 10.2478/jvetres-2022-0013
K. Urbaniak, A. Kowalczyk, M. Pomorska-Mól, K. Kwit, I. Markowska-Daniel
{"title":"Effect of Serial in Vivo Passages on The Adaptation of H1N1 Avian Influenza Virus To Pigs","authors":"K. Urbaniak, A. Kowalczyk, M. Pomorska-Mól, K. Kwit, I. Markowska-Daniel","doi":"10.2478/jvetres-2022-0013","DOIUrl":"https://doi.org/10.2478/jvetres-2022-0013","url":null,"abstract":"Abstract Introduction The lack of proofreading activity of the viral polymerase and the segmented nature of the influenza A virus (IAV) genome are responsible for the genetic diversity of IAVs and for their ability to adapt to a new host. We tried to adapt avian IAV (avIAV) to the pig by serial passages in vivo and assessed the occurrence of point mutations and their influence on viral fitness in the pig’s body. Material and Methods A total of 25 in vivo avIAV passages of the A/duck/Bavaria/77 strain were performed by inoculation of 50 piglets, and after predetermined numbers of passages 20 uninoculated piglets were exposed to the virus through contact with inoculated animals. Clinical signs of swine influenza were assessed daily. Nasal swabs and lung tissue were used to detect IAV RNA by real-time RT-PCR and isolates from selected passages were sequenced. Results Apart from a rise in rectal temperature and a sporadic cough, no typical clinical signs were observed in infected pigs. The original strain required 20 passages to improve its replication ability noticeably. A total of 29 amino-acid substitutions were identified. Eighteen of them were detected in the first sequenced isolate, of which 16 were also in all other analysed strains. Additional mutations were detected with more passages. One substitution, threonine (T) 135 to serine (S) in neuraminidase (NA), was only detected in an IAV isolate from a contact-exposed piglet. Conclusion Passaging 25 times allowed us to obtain a partially swine-adapted IAV. The improvement in isolate replication ability was most likely related to S654 to glycine (G) substitution in the basic protein (PB) 1 as well as to aspartic acid (D) 701 to asparagine (N) and arginine (R) 477 to G in PB2, glutamic acid (E) 204 to D and G239E in haemagglutinin and T135S in NA.","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"47 1","pages":"9 - 19"},"PeriodicalIF":2.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81556388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Genetic and Pathogenic Characterisation of a Virulent Akabane Virus Isolated from Goats in Yunnan, China 从云南山羊分离的一种强毒Akabane病毒的遗传和致病特性
IF 2.7 3区 农林科学
Onderstepoort Journal of Veterinary Research Pub Date : 2022-03-01 DOI: 10.2478/jvetres-2022-0007
Huanan Gao, Jinping Wang, Z. Yang, Jiarui Xie, Yuwen He, Q. Hong, A. Xin
{"title":"Genetic and Pathogenic Characterisation of a Virulent Akabane Virus Isolated from Goats in Yunnan, China","authors":"Huanan Gao, Jinping Wang, Z. Yang, Jiarui Xie, Yuwen He, Q. Hong, A. Xin","doi":"10.2478/jvetres-2022-0007","DOIUrl":"https://doi.org/10.2478/jvetres-2022-0007","url":null,"abstract":"Abstract Introduction Akabane virus (AKAV) has been detected in a variety of host species in China, but there are only limited records of its occurrence in goats. However, more attention needs to be paid to understanding the diversity of viruses in this species. The aim of the study was to explore the genotype characteristics and variation trend of AKAV and their relationship with virulence in Yunnan, China. Material and Methods Blood samples were collected from goats during routine surveillance of goat diseases in Yunnan province in 2019. The AKAV CX-01 strain was isolated using BHK-21 cells. To understand pathogenicity, the virus was intraperitoneally (IP) and intracerebrally (IC) inoculated into suckling mice and tissue samples were subsequently analysed histopathologically and immunohistochemically. Results Akabane virus CX-01 strain induced encephalitis and impairment of the central nervous system with fatal consequences. Phylogenetic analysis based on the ORF sequences of the small segments indicated that the AKAV isolate used was most closely related to the GD18134/2018 Chinese midge and bovine NM BS/1strains, while phylogenetic analysis based on the medium segments showed a close relationship between CX-01 and the Chinese GLXCH01 strain. Conclusion The CX-01 isolate was related to AKAV genogroup Ia and probably originated from a recombination of different strains.","PeriodicalId":54685,"journal":{"name":"Onderstepoort Journal of Veterinary Research","volume":"68 1","pages":"35 - 42"},"PeriodicalIF":2.7,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73174461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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