1
|
Schaer J, Cvetnic Z, Sukalic T, Dörig S, Grisiger M, Iscaro C, Feliziani F, Pfeifer F, Origgi F, Zanoni RG, Abril CE. Evaluation of Serological Methods and a New Real-Time Nested PCR for Small Ruminant Lentiviruses. Pathogens 2022; 11:pathogens11020129. [PMID: 35215072 PMCID: PMC8875174 DOI: 10.3390/pathogens11020129] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/05/2022] [Accepted: 01/14/2022] [Indexed: 12/04/2022] Open
Abstract
Small ruminant lentiviruses (SRLVs), i.e., CAEV and MVV, cause insidious infections with life-long persistence and a slowly progressive disease, impairing both animal welfare and productivity in affected herds. The complex diagnosis of SRLVs currently combines serological methods including whole-virus and peptide-based ELISAs and Immunoblot. To improve the current diagnostic protocol, we analyzed 290 sera of animals originating from different European countries in parallel with three commercial screening ELISAs, Immunoblot as a confirmatory assay and five SU5 peptide ELISAs for genotype differentiation. A newly developed nested real-time PCR was carried out for the detection and genotype differentiation of the virus. Using a heat-map display of the combined results, the drawbacks of the current techniques were graphically visualized and quantified. The immunoblot and the SU5-ELISAs exhibited either unsatisfactory sensitivity or insufficient reliability in the differentiation of the causative viral genotype, respectively. The new truth standard was the concordance of the results of two out of three screening ELISAs and the PCR results for serologically false negative samples along with genotype differentiation. Whole-virus antigen-based ELISA showed the highest sensitivity (92.2%) and specificity (98.9%) among the screening tests, whereas PCR exhibited a sensitivity of 75%.
Collapse
Affiliation(s)
- Jessica Schaer
- Institute of Virology and Immunology IVI, in Cooperation with the Vetsuisse-Faculty of the University of Bern, 3012 Bern, Switzerland; (J.S.); (R.G.Z.)
| | - Zeljko Cvetnic
- Regional Veterinary Department Križevci, Croatian Veterinary Institute, Zakmandijeva 10, 48260 Križevci, Croatia; (Z.C.); (T.S.)
| | - Tomislav Sukalic
- Regional Veterinary Department Križevci, Croatian Veterinary Institute, Zakmandijeva 10, 48260 Križevci, Croatia; (Z.C.); (T.S.)
| | - Sven Dörig
- Beratungs-und Gesundheitsdienst für Kleinwiederkäuer (BGK/SSPR), 3362 Niederoenz, Switzerland;
| | | | - Carmen Iscaro
- National Reference Laboratory for Ruminant Retroviruses, Istituto Zooprofilattico, Sperimentale dell’Umbria e delle Marche Togo Rosati, 06126 Perugia, Italy; (C.I.); (F.F.)
| | - Francesco Feliziani
- National Reference Laboratory for Ruminant Retroviruses, Istituto Zooprofilattico, Sperimentale dell’Umbria e delle Marche Togo Rosati, 06126 Perugia, Italy; (C.I.); (F.F.)
| | - Folke Pfeifer
- Tierseuchenkasse/Tiergesundheitsdienst Sachsen-Anhalt, 39116 Magdeburg, Germany;
| | - Francesco Origgi
- Institute of Veterinary Pathology, Vetsuisse-Faculty of the University of Bern, 3012 Bern, Switzerland;
| | - Reto Giacomo Zanoni
- Institute of Virology and Immunology IVI, in Cooperation with the Vetsuisse-Faculty of the University of Bern, 3012 Bern, Switzerland; (J.S.); (R.G.Z.)
| | - Carlos Eduardo Abril
- Institute of Virology and Immunology IVI, in Cooperation with the Vetsuisse-Faculty of the University of Bern, 3012 Bern, Switzerland; (J.S.); (R.G.Z.)
- Correspondence: ; Tel.: +41-31-631-2423
| |
Collapse
|
2
|
Singh R, Kumar P, Singh R, Dhama K, Kumari S, Yadav JP, Kashyap G, Singh KP, Singh V, Sahoo M. Pathology and polymerase chain reaction detection of ovine progressive pneumonia (maedi) cases in slaughtered sheep in India. Vet World 2017; 10:1401-1406. [PMID: 29263606 PMCID: PMC5732350 DOI: 10.14202/vetworld.2017.1401-1406] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 10/25/2017] [Indexed: 11/16/2022] Open
Abstract
Aim The small ruminant lentiviruses are known to cause maedi-visna (MV) and caprine arthritis - encephalitis in sheep and goats, typically affecting joints, udder, lungs, and the central nervous system. The diagnosis usually involves serology, clinical signs, immunohistochemistry, and polymerase chain reaction (PCR). In the present study, the histopathologically positive pneumonia cases of MV were confirmed by PCR in lung tissue probably for the first time in India. Materials and Methods A total of 888 lungs of adult sheep, aged between 2 and 5 years, were screened during slaughter, of which 121 were found to have pneumonic lesions. The tissues from each pneumonic lung including associated lymph nodes were collected in 10% neutral buffered formalin for histopathology. The frozen tissues of the same were also collected and stored at -20°C for PCR confirmation. Results Three of 121 cases of pneumonic lungs of sheep revealed gross and histopathological lesions suggestive of maedi or ovine progressive pneumonia infection. These 3 cases were further confirmed by PCR technique that amplified 291-base pair DNA in the long terminal repeat sequence of MV provirus. Conclusion This study suggests the low occurrence of MV virus (MVV) infection in India in naturally affected sheep based on pathomorphological lesions and using the molecular tool of PCR detection of the virus in tissues. Further, a combination of pathomorphology or/and PCR testing might be optimal for detecting the animals infected with MVV.
Collapse
Affiliation(s)
- Rahul Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Pawan Kumar
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Rajendra Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Swati Kumari
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Jay Prakash Yadav
- Division of Veterinary Public Health, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Gayatri Kashyap
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Karam Pal Singh
- Division of Pathology, Centre for Animal Disease Research and Diagnosis, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Vidya Singh
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| | - Monalisa Sahoo
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Bareilly, Izatnagar - 243 122, Uttar Pradesh, India
| |
Collapse
|
3
|
Fieni F, Lamara A, Ali Al Ahmad MZ, Cortez-Romero C, Pellerin JL. Caprine arthritis encephalitis: an example of risk assessment for embryo trading. Reprod Fertil Dev 2016; 29:37-51. [PMID: 28278792 DOI: 10.1071/rd16358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The risk of transmission of caprine arthritis encephalitis virus (CAEV) during embryo transfer has been demonstrated in vivo through the detection of CAEV proviral DNA in: (1) flushing media for embryo collection; (2) cells of the cumulus oophorus surrounding the oocytes, ovarian follicle, oviduct and uterine tissues; and (3) testis, epididymis, vas deferens and vesicular glands. Experimentally infected embryos without a zona pellucida (ZP), washed 10 times with Minimum Essential Media (MEM) and 5% Fetal Calf Serum (FCS) solution, were capable of transmitting CAEV. In vitro we demonstrated that granulosa, oviductal, epididymal and embryo cells are fully susceptible to CAEV infection and allow active replication. However, AI with in vitro-infected semen can result in the production, after ten washing, of CAEV-free embryos, and ten washing in vitro- or in vivo-infected embryos with an intact ZP, or ten washing oocytes with an intact ZP, resulted in the production of virus-free female gametes or embryos that can be used for IVF or embryo transfer. Therefore, we have demonstrated that: (1) that CAEV-free embryos can be produced by IVF using spermatozoa infected in vitro by CAEV; and (2) embryo transfer can be used under field conditions to produce CAEV-free kids from CAEV-infected biological mothers.
Collapse
Affiliation(s)
- Francis Fieni
- L'Université Nantes Angers Le Mans (L'UNAM), Oniris, Nantes-Atlantic National College of Veterinary Medicine, Food Science and Engineering, Sanitary Security of Reproduction Biotechnology Unit, Nantes, BP 40706, 44307 Nantes CEDEX 03, France
| | - Ali Lamara
- L'Université Nantes Angers Le Mans (L'UNAM), Oniris, Nantes-Atlantic National College of Veterinary Medicine, Food Science and Engineering, Sanitary Security of Reproduction Biotechnology Unit, Nantes, BP 40706, 44307 Nantes CEDEX 03, France
| | - Mohamad Zuher Ali Al Ahmad
- L'Université Nantes Angers Le Mans (L'UNAM), Oniris, Nantes-Atlantic National College of Veterinary Medicine, Food Science and Engineering, Sanitary Security of Reproduction Biotechnology Unit, Nantes, BP 40706, 44307 Nantes CEDEX 03, France
| | - Cesar Cortez-Romero
- L'Université Nantes Angers Le Mans (L'UNAM), Oniris, Nantes-Atlantic National College of Veterinary Medicine, Food Science and Engineering, Sanitary Security of Reproduction Biotechnology Unit, Nantes, BP 40706, 44307 Nantes CEDEX 03, France
| | - Jean-Louis Pellerin
- L'Université Nantes Angers Le Mans (L'UNAM), Oniris, Nantes-Atlantic National College of Veterinary Medicine, Food Science and Engineering, Sanitary Security of Reproduction Biotechnology Unit, Nantes, BP 40706, 44307 Nantes CEDEX 03, France
| |
Collapse
|
4
|
Underwood WJ, Blauwiekel R, Delano ML, Gillesby R, Mischler SA, Schoell A. Biology and Diseases of Ruminants (Sheep, Goats, and Cattle). LABORATORY ANIMAL MEDICINE 2015. [PMCID: PMC7149867 DOI: 10.1016/b978-0-12-409527-4.00015-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Ruminants continue to be important in their traditional role in agricultural research and teaching. They are now also extensively used for studies in molecular biology; genetic engineering; and biotechnology for basic science, agricultural and clinical applications. Concern and interest for the welfare for these species and improved understanding of their biology and behavior have continued and are reflected in changing husbandry and management systems. This chapter addresses at high levels basic biology, husbandry, and the more common or important diseases of the three ruminant species used most commonly in the laboratory, namely sheep, goats and cattle.
Collapse
Affiliation(s)
| | - Ruth Blauwiekel
- University of Vermont, Hills Building, Carrigan Drive, Burlington, VT, USA
| | | | - Rose Gillesby
- Veterinary Services and Biocontainment Research, Animal Research Support, Zoetis, Richland, MI, USA
| | - Scott A. Mischler
- Worldwide Comparative Medicine, Pfizer Inc., Middletown Rd., Pearl River, NY, USA
| | | |
Collapse
|
5
|
Small ruminant lentiviruses: genetic variability, tropism and diagnosis. Viruses 2013; 5:1175-207. [PMID: 23611847 PMCID: PMC3705272 DOI: 10.3390/v5041175] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 04/09/2013] [Accepted: 04/12/2013] [Indexed: 02/05/2023] Open
Abstract
Small ruminant lentiviruses (SRLV) cause a multisystemic chronic disease affecting animal production and welfare. SRLV infections are spread across the world with the exception of Iceland. Success in controlling SRLV spread depends largely on the use of appropriate diagnostic tools, but the existence of a high genetic/antigenic variability among these viruses, the fluctuant levels of antibody against them and the low viral loads found in infected individuals hamper the diagnostic efficacy. SRLV have a marked in vivo tropism towards the monocyte/macrophage lineage and attempts have been made to identify the genome regions involved in tropism, with two main candidates, the LTR and env gene, since LTR contains primer binding sites for viral replication and the env-encoded protein (SU ENV), which mediates the binding of the virus to the host’s cell and has hypervariable regions to escape the humoral immune response. Once inside the host cell, innate immunity may interfere with SRLV replication, but the virus develops counteraction mechanisms to escape, multiply and survive, creating a quasi-species and undergoing compartmentalization events. So far, the mechanisms of organ tropism involved in the development of different disease forms (neurological, arthritic, pulmonary and mammary) are unknown, but different alternatives are proposed. This is an overview of the current state of knowledge on SRLV genetic variability and its implications in tropism as well as in the development of alternative diagnostic assays.
Collapse
|
6
|
Pinheiro R, Andrioli A, Gouveia A, Aragão M, Martinez P. AVALIAÇÃO DE ANTÍGENOS PARA O DIAGNÓSTICO DE LENTIVÍRUS EM REBANHO CAPRINO SOB PROGRAMA DE CONTROLE. ARQUIVOS DO INSTITUTO BIOLÓGICO 2010. [DOI: 10.1590/1808-1657v77p1332010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
RESUMO Este trabalho teve como objetivo comparar os resultados do diagnóstico do Lentivírus Caprino, por Imunodifusão em Gel de ágar - IDGA, utilizando o kit comercial americano e o kit nacional produzido com cepa CAEV Cork. Foram utilizados dois rebanhos, sendo um da Embrapa Caprinos submetido a doze anos de programa de controle e um outro rebanho infectado pelo CAEV, que não teve nenhuma ação prévia de controle. Analisando os resultados dos antígenos (nacional e americano) no rebanho não controlado, verificou-se que o antígeno comercial americano, quando foi utilizado pela primeira vez para o diagnóstico apresentou resultados mais significativos do que o nacional. Já no rebanho controlado, o antígeno nacional detectou um número maior de positivos. Analisando os dados do trabalho verificou-se a importância da alternância de proteínas imunogênicas presentes no antígeno dos kits de diagnóstico usados em programas de controle da Artrite Encefalite Caprina, haja vista a variação das respostas ao diagnóstico segundo a proteína expressa pelo vírus.
Collapse
Affiliation(s)
| | | | | | | | - P.M. Martinez
- Companhia de Desenvolvimento de Vale do São Francisco, Brasil
| |
Collapse
|
7
|
Ghanem Y, El-Khodery S, Saad AA, Elragaby S, Abdelkader A, Heybe A. Prevalence and risk factors of caprine arthritis encephalitis virus infection (CAEV) in Northern Somalia. Small Rumin Res 2009. [DOI: 10.1016/j.smallrumres.2009.09.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
8
|
Ali Al Ahmad MZ, Chebloune Y, Bouzar BA, Baril G, Bouvier F, Chatagnon G, Leboeuf B, Pepin M, Guibert JM, Russo P, Manfredi E, Martin J, Fieni F. Lack of risk of transmission of caprine arthritis-encephalitis virus (CAEV) after an appropriate embryo transfer procedure. Theriogenology 2007; 69:408-15. [PMID: 18036653 DOI: 10.1016/j.theriogenology.2007.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2007] [Revised: 10/06/2007] [Accepted: 10/10/2007] [Indexed: 10/22/2022]
Abstract
The aim of this study was to demonstrate that embryo transfer can be used to produce CAEV-free kids from CAEV-infected biological mothers when appropriate procedure is implemented. Twenty-eight goats that had tested positive for CAEV using PCR on vaginal secretions were used as embryo donors. Embryos with intact-ZP were selected and washed 10 times; they were then frozen and used for transfer into CAEV-free recipient goats. Nineteen of the 49 recipient goats gave birth, producing a total of 23 kids. Three blood samples were taken from each recipient goat, 10 days before, during, and 10 days after parturition; these were tested for CAEV antibodies using ELISA and for CAEV proviral DNA using PCR. The mothers were then euthanized. Tissue samples were taken from the lungs, udder, and retromammary and prescapular lymph nodes. The kids were separated from their mothers at birth. Seven of them died. At 4 months of age, 16 kids were subjected to drug-induced immunosuppression. Blood samples were taken every month from birth to 4 months of age; samples were then taken on days 15, 21, and 28 after the start of the immunosuppressive treatment. The kids were then euthanized and tissue samples taken from the carpal synovial membrane, lung tissue, prescapular lymph nodes, inguinal and retromammary lymph nodes, and uterus. All samples from the 19 recipient goats and 23 kids were found to be negative for CAEV antibodies and/or CAEV proviral DNA. Under acute conditions for infection this study clearly demonstrates that embryo transfer can be safely used to produce CAEV-free neonates from infected CAEV donors.
Collapse
Affiliation(s)
- M Z Ali Al Ahmad
- Department of Research into the Health Risks and Biotechnology of Reproduction ENVN/DGER, National Veterinary School, Nantes Cedex 03, France
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Angelopoulou K, Brellou GD, Greenland T, Vlemmas I. A novel deletion in the LTR region of a Greek small ruminant lentivirus may be associated with low pathogenicity. Virus Res 2006; 118:178-84. [PMID: 16446005 DOI: 10.1016/j.virusres.2005.12.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Revised: 12/17/2005] [Accepted: 12/23/2005] [Indexed: 11/22/2022]
Abstract
Greek small ruminant lentivirus (SRLV) strains remain relatively uncharacterized at the molecular level, despite the fact that lentiviral diseases of small ruminants are known to be widespread in the country. In the present study, we investigated the sequence diversity of the LTR region in Greek SRLV strains from sheep with and without disease symptoms, since sequence differences within this genomic area have been shown to lead to SRLVs with distinct replication rates. The AP-4 and AML (vis) motifs and the TATA-box were highly conserved among Greek strains, whereas the two AP-1 sites exhibited some substitutions. Pairwise comparisons with reference strains revealed that Greek LTR sequences were closer to the ovine strains (25.7% average divergence) rather than the caprine strain CAEV (59.1% average divergence). The most striking difference observed between the two groups of animals was a 13-14 nucleotide deletion in the strains obtained from the asymptomatic sheep. The deletion was located within the R region of LTR, which was also found to be much less homologous (39.6% average divergence) than the U3 and U5. Taken together, our data suggest that the R region of LTR may be involved in virus transcriptional activation. Furthermore, a specific deletion within this region may, at least in part, be associated with low pathogenicity of some SRLV strains.
Collapse
Affiliation(s)
- K Angelopoulou
- Laboratory of Biochemistry and Toxicology, School of Veterinary Medicine, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | | | | | | |
Collapse
|
10
|
Alvarez V, Daltabuit-Test M, Arranz J, Leginagoikoa I, Juste RA, Amorena B, de Andrés D, Luján L, Badiola JJ, Berriatua E. PCR detection of colostrum-associated Maedi-Visna virus (MVV) infection and relationship with ELISA-antibody status in lambs. Res Vet Sci 2006; 80:226-34. [PMID: 16045950 DOI: 10.1016/j.rvsc.2005.05.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2004] [Revised: 03/31/2005] [Accepted: 05/03/2005] [Indexed: 11/17/2022]
Abstract
A recent large-scale experimental study showed that bottle-feeding ovine colostrum from seropositive ewes results in high MVV-seroconversion in lambs. In contrast, relatively few lambs that naturally suckled colostrum from seropositive dams seroconverted as a result of it. Furthermore, lambs fed uninfected bovine colostrum readily seroconverted when mixed with ovine-colostrum lambs indicating that horizontal MVV transmission between lambs was efficient. MVV-infection was further investigated in the same samples using two PCR tests targeting sequences in the long-terminal repeats (LTR) and POL MVV genes. PCR-tests confirmed previous serological findings. However, the LTR-PCR was more sensitive and allowed detecting infection earlier than the other tests, including 5-8% of new-born lambs from seropositive dams, providing more evidence that prenatal MVV-infection may be more important than considered. The degree of agreement between PCR and antibody tests in individual samples was low up to 6 months of age and moderate at 10 months-old. Nine percent of lambs were always PCR-negative but seroconverted and 19% of lambs were PCR-positive at least once and did not seroconvert. However, seroconversion was associated with increasing number of times lambs were PCR-positive and ovine colostrum-fed lambs were more frequently PCR-positive than other lambs. The significance of these findings in terms of MVV-infection, epidemiology and control is discussed.
Collapse
MESH Headings
- Aging
- Animals
- Antibodies, Viral/blood
- Colostrum/virology
- Enzyme-Linked Immunosorbent Assay/veterinary
- Female
- Infectious Disease Transmission, Vertical/veterinary
- Male
- Odds Ratio
- Pneumonia, Progressive Interstitial, of Sheep/blood
- Pneumonia, Progressive Interstitial, of Sheep/immunology
- Pneumonia, Progressive Interstitial, of Sheep/transmission
- Pneumonia, Progressive Interstitial, of Sheep/virology
- Polymerase Chain Reaction/veterinary
- Sheep
- Visna-maedi virus/genetics
- Visna-maedi virus/isolation & purification
Collapse
Affiliation(s)
- V Alvarez
- Instituto Vasco de Investigación y Desarrollo Agrario (NEIKER), Sanidad Animal, 48160-Derio, Vizcaya, Spain
| | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Karanikolaou K, Angelopoulou K, Papanastasopoulou M, Koumpati-Artopiou M, Papadopoulos O, Koptopoulos G. Detection of small ruminant lentiviruses by PCR and serology tests in field samples of animals from Greece. Small Rumin Res 2005. [DOI: 10.1016/j.smallrumres.2004.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
12
|
Abstract
Selection of proper assays and appropriate interpretation of results can be a challenge to the veterinary clinician. Assays vary in methodology, sensitivity, and specificity. These assays can be invaluable in attaining the correct diagnosis, but a clear understanding of the assay and the results is essential. To this end, communication with the laboratory personnel is crucial. Optimal sample selection, shipping recommendations, assay selection, and interpretation should be discussed with the laboratory staff.
Collapse
Affiliation(s)
- Melissa Kennedy
- Department of Comparative Medicine, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA
| |
Collapse
|
13
|
Callan RJ, Van Metre DC. Viral diseases of the ruminant nervous system. Vet Clin North Am Food Anim Pract 2004; 20:327-62, vii. [PMID: 15203229 DOI: 10.1016/j.cvfa.2004.02.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
This article presents the etiology, epidemiology, clinical features,and diagnosis of the primary viral neurologic diseases observed in ruminants. In general, these viral neurologic diseases are uncommon but often fatal. Rabies virus is perhaps the most important cause of encephalitis in cattle because of the public health implications. Other viral encephalitis diseases in ruminants include bovine herpesvirus encephalomyelitis, pseudorabies, malignant catarrhal fever, ovine and caprine lentiviral encephalitis, West Nile virus encephalitis, Borna disease, paramyxoviral sporadic bovine encephalomyelitis,and ovine encephalomyelitis (louping-ill).
Collapse
Affiliation(s)
- Robert J Callan
- Department of Clinical Sciences, Colorado State University, 300 West Drake Road, Fort Collins, CO 80523, USA.
| | | |
Collapse
|
14
|
Ferrell EA, Gavin PR, Tucker RL, Sellon DC, Hines MT. Magnetic resonance for evaluation of neurologic disease in 12 horses. Vet Radiol Ultrasound 2002; 43:510-6. [PMID: 12502103 DOI: 10.1111/j.1740-8261.2002.tb01041.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Magnetic resonance (MR) imaging was used as a neurodiagnostic modality in the assessment of 12 horses with neurologic disease localized cranial to the foramen magnum. This retrospective study included a mixed population of horse breeds and consisted of three foals and nine adult horses. MR sequences of the head and central nervous system of each horse were acquired. Routine MR sequences included transverse T1 weighted (T1wt), T2 weighted (T2wt), and proton density images. Additional imaging sequences were obtained on a patient-dependent basis. Eight neurologic related diseases were diagnosed. MRI imaging of the horse head is a feasible and valuable neurodiagnostic modality in the assessment of equine neurologic diseases.
Collapse
Affiliation(s)
- Eric A Ferrell
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington, USA
| | | | | | | | | |
Collapse
|
15
|
|
16
|
Varea R, Monleón E, Pacheco C, Luján L, Bolea R, Vargas MA, Van Eynde G, Saman E, Dickson L, Harkiss G, Amorena B, Badiola JJ. Early detection of maedi-visna (ovine progressive pneumonia) virus seroconversion in field sheep samples. J Vet Diagn Invest 2001; 13:301-7. [PMID: 11478601 DOI: 10.1177/104063870101300404] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of this work was to investigate whether an enzyme-linked immunosorbent assay (ELISA) was useful for early detection of maedi-visna virus (MVV) infection in sheep under field conditions. An ELISA based on p25 recombinant protein and a gp46 synthetic peptide was used. Sequentially obtained serum samples (n = 1,941) were studied for 4 years. ELISA results were compared with those of the agar gel immunodiffusion (AGID) test, and results of both tests were compared with a reference result established using consensus scores for at least 2 of 3 serologic techniques (AGID, ELISA, and western blotting, which was used to resolve result discrepancies between the other 2 techniques). A total of 247 discrepancies were observed between ELISA and AGID. Of these, 131 were due to an earlier detection of 120 sera by the ELISA and 11 sera by AGID. The remaining discrepancies (116) were due to the presence of false reactions in both tests. Fewer false-negative results were found by ELISA than with AGID (6 vs. 69 sera, respectively), whereas the number of false-positive results was virtually the same for ELISA and AGID (21 vs. 20, respectively). In relation to the reference result, ELISA sensitivity and specificity were 97.8% and 98.2%, respectively, whereas values for AGID were 76.3% and 98.3%, respectively. The agreement between ELISA and the reference result was higher than that between AGID and the reference result (K value: 0.96 and 0.77, respectively). A variation in the ELISA signal (based on optical density) was observed during the study period, suggesting different antibody levels throughout the animal's life. The ELISA was useful for detecting MVV-infected sheep in field conditions and has potential for use in control and eradication programs.
Collapse
Affiliation(s)
- R Varea
- Department of Animal Pathology, University of Zaragoza, Veterinary Faculty, Spain
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Guedes M, Souza J, Gouveia A. Infecção experimental em cabritos pelo vírus da artrite encefalite. ARQ BRAS MED VET ZOO 2001. [DOI: 10.1590/s0102-09352001000100003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Vinte e quatro caprinos de uma semana de idade, soronegativos pela imunodifusão em gel de agar para artrite encefalite caprina (AEC), foram utilizados para estudo de infecção experimental pelo vírus da AEC. Dezesseis animais foram inoculados com lentivirus caprino, amostra Cork, oito pela via intravenosa e oito por instilação nasal. Oito animais serviram como controle, inoculados pelas vias intranasal ou intravenosa com 1ml de meio de cultura de células não infectadas. Os animais foram sacrificados aos 2, 6, 12 e 20 dias pós-inoculação (PI), e colhidas amostras do sistema nervoso central, articulações, tonsilas, linfonodos, pulmões, rins, timo, baço e intestinos delgado e grosso para histopatologia e imunoistoquímica. Um animal inoculado com o vírus da AEC pela via intranasal e sacrificado aos 20 dias PI apresentou imunomarcação positiva em um macrófago alveolar. Concluiu-se que a via aerógena é uma provável rota de infecção pelo vírus da AEC.
Collapse
|
18
|
Saman E, Van Eynde G, Lujan L, Extramiana B, Harkiss G, Tolari F, Gonzàlez L, Amorena B, Watt N, Badiola J. A new sensitive serological assay for detection of lentivirus infections in small ruminants. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 1999; 6:734-40. [PMID: 10473527 PMCID: PMC95764 DOI: 10.1128/cdli.6.5.734-740.1999] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Lentivirus infections in small ruminants represent an economic problem affecting several European countries with important sheep-breeding industries. Programs for control and eradication of these infections are being initiated and require reliable screening assays. This communication describes the construction and evaluation of a new serological screening enzyme-linked immunosorbent assay (ELISA) for the detection of antibodies to maedi-visna virus (MVV) in sheep and to caprine arthritis encephalitis virus (CAEV) in goats. The solid phase is sensitized with a combination of the major core protein p25 of MVV produced in Escherichia coli and a peptide derived from the immunodominant region of the viral transmembrane protein gp46. The peptide carries an N-terminal biotin residue and is complexed with streptavidin prior to being coated. The new assay was evaluated with 2,336 sheep serum samples from different European countries with large differences in the levels of prevalence of MVV infections, and the results have been compared to those of the standard agar gel immunodiffusion test. Discrepant samples were analyzed by Western blotting with viral lysate, and most sera could be classified unambiguously. The estimated overall sensitivity of the new ELISA was 99.4% (95% confidence interval [CI], 98.4 to 99. 8%) and the specificity was 99.3% (95% CI, 98.7 to 99.6%). A limited set of goat sera (n = 212) was also analyzed, with similar results. These data indicate that the new assay is a reliable tool that can be used in control and eradication programs for small ruminant lentivirus infections.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Antibodies, Viral/analysis
- Antibodies, Viral/blood
- Antibody Specificity
- Antisense Elements (Genetics)
- Arthritis-Encephalitis Virus, Caprine/genetics
- Arthritis-Encephalitis Virus, Caprine/immunology
- Arthritis-Encephalitis Virus, Caprine/isolation & purification
- Blotting, Western
- Enzyme-Linked Immunosorbent Assay/methods
- Europe
- Female
- Gene Products, env/analysis
- Gene Products, env/genetics
- Gene Products, env/immunology
- Gene Products, gag/analysis
- Gene Products, gag/genetics
- Gene Products, gag/immunology
- Glutathione Transferase/genetics
- Goats
- Immunodominant Epitopes/analysis
- Immunodominant Epitopes/immunology
- Lentivirus Infections/diagnosis
- Lentivirus Infections/immunology
- Mass Screening/methods
- Milk/virology
- Molecular Sequence Data
- Pneumonia, Progressive Interstitial, of Sheep/diagnosis
- Recombinant Proteins/immunology
- Sensitivity and Specificity
- Sheep
- Sheep Diseases/diagnosis
- Sheep Diseases/virology
- Viral Proteins/analysis
- Viral Proteins/genetics
- Visna-maedi virus/genetics
- Visna-maedi virus/immunology
- Visna-maedi virus/isolation & purification
Collapse
Affiliation(s)
- E Saman
- Innogenetics NV, B-9052 Zwijnaarde, Belgium.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Evermann JF, Eriks IS. Diagnostic medicine: the challenge of differentiating infection from disease and making sense for the veterinary clinician. ADVANCES IN VETERINARY MEDICINE 1999; 41:25-38. [PMID: 9890007 PMCID: PMC7149316 DOI: 10.1016/s0065-3519(99)80006-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- J F Evermann
- Department of Veterinary Clinical Sciences, Washington State University, Pullman 99164, USA
| | | |
Collapse
|