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Villafañe L, Rocha RV, Bigi MM, Klepp LI, Taboga OA, Forrellad MA, López MG, Bigi F. Expression and field evaluation of new Mycobacterium bovis antigens. Vet Immunol Immunopathol 2024; 273:110788. [PMID: 38838485 DOI: 10.1016/j.vetimm.2024.110788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/20/2024] [Accepted: 05/19/2024] [Indexed: 06/07/2024]
Abstract
Bovine tuberculosis (bTB) represents a threat to livestock production. Mycobacterium bovis is the main causative agent of bTB and a pathogen capable of infecting wildlife and humans. Eradication programs based on surveillance in slaughterhouses with mandatory testing and culling of reactive cattle have failed to eradicate bTB in many regions worldwide. Therefore, developing effective tools to control this disease is crucial. Using a computational tool, we identified proteins in the M. bovis proteome that carry predictive binding peptides to BoLADRB3.2 and selected Mb0309, Mb1090, Mb1810 and Mb3810 from all the identified proteins. The expression of these proteins in a baculovirus-insect cell expression system was successful only for Mb0309 and Mb3810. In parallel, we expressed the ESAT-6 family proteins EsxG and EsxH in this system. Among the recombinant proteins, Mb0309 and EsxG exhibited moderate performance in distinguishing between cattle that test positive and negative to bTB using the official test, the intradermal tuberculin test (IDT), when used to stimulate interferon-gamma production in blood samples from cattle. However, when combined as a protein cocktail, Mb0309 and EsxG were reactive in 50 % of positive cattle. Further assessments in cattle that evade the IDT (false negative) and cattle infected with Mycobacterium avium paratuberculosis are necessary to determine the potential utility of this cocktail as an additional tool to assist the accurate diagnosis of bTB.
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Affiliation(s)
- Luciana Villafañe
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | - Rosana Valeria Rocha
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | | | - Laura Inés Klepp
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | - Oscar Alberto Taboga
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | - Marina Andrea Forrellad
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | - María Gabriela López
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina
| | - Fabiana Bigi
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina; Instituto de Agrobiotecnología y Biología Molecular, (IABIMO) INTA-CONICET, Argentina.
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Lakew M, Tadesse B, Srinivasan S, Aschalew M, Andarge B, Kebede D, Etifu A, Alemu T, Yalew B, Benti T, Olani A, Abera S, Bedada W, Fromsa A, Mekonnen GA, Almaw G, Ameni G, Ashenafi H, Gumi B, Bakker D, Kapur V. Assessing the feasibility of test-and-cull and test-and-segregation approaches for the control of high-prevalence bovine tuberculosis in Ethiopian intensive dairy farms. Sci Rep 2024; 14:14298. [PMID: 38906922 PMCID: PMC11192749 DOI: 10.1038/s41598-024-64884-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 06/13/2024] [Indexed: 06/23/2024] Open
Abstract
Bovine tuberculosis (bTB) is endemic and has a substantial impact on the livestock sector in Ethiopia and other low and middle-income countries (LMICs). With a national emphasis on dairy farm intensification to boost milk production and spur economic growth, the incidence of bTB is anticipated to rise. However, Ethiopia, like other LMICs, lacks a comprehensive national bTB control strategy due to the economic and social infeasibility of traditional test-and-cull (TC) approaches. To inform the development of such a strategy, we evaluated the effectiveness and feasibility of TC and test-and-segregation (TSg) strategies for bTB control on Ethiopian dairy farms. A TC approach was used at Farm A [N = 62; comparative cervical test (CCT) > 4 mm, starting prevalence 11.3%] while TSg was implemented at Farm B (N = 45; CCT > 4 mm, prevalence 22.2%), with testing intervals of 2-4 months. Both strategies achieved a reduction in bTB prevalence to 0%, requiring seven rounds of TC over 18 months at Farm A, and five rounds of TSg over 12 months at Farm B's negative herd. The results show that adopting more sensitive thresholds [CCT > 0 mm or single cervical test (SCT) > 2 mm] during later rounds was pivotal in identifying and managing previously undetected infections, emphasizing the critical need for optimized diagnostic thresholds. Cost analysis revealed that TC was approximately twice as expensive as TSg, primarily due to testing, labor, and cow losses in TC, versus construction of new facilities and additional labor for TSg. This underscores the economic and logistical challenges of bTB management in resource-limited settings. Taken together, our study highlights an urgent need for the exploration of alternative approaches including TSg and or vaccination to mitigate within herd transmission and enable implementation of bTB control in regions where TC is not feasible.
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Affiliation(s)
- Matios Lakew
- Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia.
| | | | | | | | | | | | | | | | - Bekele Yalew
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Teferi Benti
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Abebe Olani
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Shubisa Abera
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Wegene Bedada
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Abebe Fromsa
- Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
| | | | - Gizat Almaw
- Animal Health Institute, P.O. Box 04, Sebeta, Ethiopia
| | - Gobena Ameni
- Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
- Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, United Arab Emirates University, PO Box 15551, Al Ain, United Arab Emirates
| | - Hagos Ashenafi
- Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
| | - Balako Gumi
- Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
| | - Douwe Bakker
- Independent Researcher and Technical Consultant, Lelystad, The Netherlands.
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
| | - Vivek Kapur
- Department of Animal Science, The Pennsylvania State University, University Park, PA, USA.
- Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, USA.
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3
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Jiménez-Martín D, García-Bocanegra I, Risalde MA, Napp S, Domínguez M, Romero B, Moreno I, Martínez R, Cano-Terriza D. Mycobacterium tuberculosis complex in domestic goats in Southern Spain. Prev Vet Med 2024; 227:106204. [PMID: 38604014 DOI: 10.1016/j.prevetmed.2024.106204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 04/02/2024] [Accepted: 04/05/2024] [Indexed: 04/13/2024]
Abstract
Tuberculosis (TB) is a zoonotic infectious disease caused by bacteria belonging to the Mycobacterium tuberculosis complex (MTC), which can affect a wide variety of domestic and wild animal species. Although the role of goats as a reservoir of MTC bacteria has been evidenced, information about the circulation of MTC strains in this species is still very scarce. The aim of the present study was to determine the seroprevalence, spatial distribution, risk factors and MTC spoligotypes circulating in goats from Andalusia (Southern Spain), the Spanish region with the largest goat census and a hotspot area of TB in both cattle and wild ungulates. A total of 2155 serum samples from 80 goat flocks were analyzed by an in-house ELISA using the P22 protein complex as a coating antigen. Antibodies against MTC were detected in 473 goats (21.9%, 95% CI: 20.2-23.7) and the true seroprevalence was 22.3% (95% CI: 20.6-24.1). Seropositivity was found in 72 (90.0%) of the 80 flocks analyzed. The generalized estimating equation model showed that the management system (higher seroprevalence on intensive and semi-intensive farms), and the presence of hospital pens inside the regular stables, were risk factors potentially associated with MTC exposure in goats in Southern Spain. The spatial analysis identified a significant spatial cluster (p < 0.001) in Eastern Andalusia. A total of 16 different MTC spoligotypes, including five of M. caprae and eleven of M. bovis, were identified in goats between 2015 and 2022 in the study area, with SB0157 as the most frequently isolated. The results obtained indicate widespread and non-homogeneous spatial distribution of MTC in goat herds from Southern Spain. The high individual and herd-level seroprevalence values found suggest that goats could play a significant role in the maintenance and transmission of MTC in the study area. Our results highlight the importance of implementing control measures in this species.
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Affiliation(s)
- Débora Jiménez-Martín
- Departamento de Sanidad Animal, Grupo de Investigación en Sanidad Animal y Zoonosis (GISAZ), UIC Zoonosis y Enfermedades Emergentes ENZOEM, Universidad de Córdoba, Córdoba, Spain
| | - Ignacio García-Bocanegra
- Departamento de Sanidad Animal, Grupo de Investigación en Sanidad Animal y Zoonosis (GISAZ), UIC Zoonosis y Enfermedades Emergentes ENZOEM, Universidad de Córdoba, Córdoba, Spain; CIBERINFEC, ISCIII - CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Spain.
| | - María A Risalde
- CIBERINFEC, ISCIII - CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Spain; Departamento de Anatomía y Anatomía Patológica Comparadas y Toxicología, Grupo de Investigación en Sanidad Animal y Zoonosis (GISAZ), UIC Zoonosis y Enfermedades Emergentes ENZOEM, Universidad de Córdoba, Córdoba, Spain
| | - Sebastián Napp
- IRTA, Animal Health Research Centre (CReSA IRTA-UAB), Bellaterra, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - Beatriz Romero
- Centro de Vigilancia Sanitaria Veterinaria (VISAVET) y Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - Remigio Martínez
- Departamento de Sanidad Animal, Grupo de Investigación en Sanidad Animal y Zoonosis (GISAZ), UIC Zoonosis y Enfermedades Emergentes ENZOEM, Universidad de Córdoba, Córdoba, Spain
| | - David Cano-Terriza
- Departamento de Sanidad Animal, Grupo de Investigación en Sanidad Animal y Zoonosis (GISAZ), UIC Zoonosis y Enfermedades Emergentes ENZOEM, Universidad de Córdoba, Córdoba, Spain; CIBERINFEC, ISCIII - CIBER de Enfermedades Infecciosas, Instituto de Salud Carlos III, Spain
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Encinas M, Ferrara Muñiz X, Sammarruco RA, Ruiz Menna V, Garro CJ, Delgado F, Macías A, Magnano G, Zumárraga MJ, Garbaccio SG, Eirin ME. Limited usefulness of the IS 6110 touchdown-PCR in blood for tuberculin skin test false-negative cattle with serological response to Mycobacterium bovis. Front Vet Sci 2024; 11:1359205. [PMID: 38835898 PMCID: PMC11149419 DOI: 10.3389/fvets.2024.1359205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 04/23/2024] [Indexed: 06/06/2024] Open
Abstract
Ante-mortem diagnosis of bovine tuberculosis (bTB) is based mainly on the tuberculin skin test (TST) and the ɣ-IFN release assay (IGRA). Some infected animals escape screening tests, thus, limit herd sanitation. Previous reports have suggested a predominant pattern of multi-organ lesions attributable to Mycobacterium bovis (the causative agent of bTB) bacteraemia. A case-control study was conducted to investigate blood PCR as an alternative tool for improving ante-mortem detection of TST false-negative bovines. Cases comprised 70 TST false-negative bovines (cases), which were serology positive, and controls included 81 TST positive bovines; all of them confirmed as infected with M. bovis. Detection of the IS6110 target through touchdown blood-PCR (IS6110 TD-PCR) was performed. The positivity of the blood-PCR was 27.2% in the control group. This performance was similar to the 15% obtained among cases (p = 0.134). Most cases identified by the IS6110 TD-PCR exhibited focalized lesions (p = 0.002). Results demonstrated that blood-PCR could detect TST false-negative cattle, even if they are negative for IGRA. Considering that cases exhibited humoral response to M. bovis, further studies conducted in a pre-serological stage could provide evidence about the real contribution of the technique in herds.
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Affiliation(s)
- Micaela Encinas
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo) UEDD CONICET-INTA, Centro de Investigación en Ciencias Veterinarias y Agronómicas (CICVyA)-CNIA, Hurlingham, Argentina
| | - Ximena Ferrara Muñiz
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo) UEDD CONICET-INTA, Centro de Investigación en Ciencias Veterinarias y Agronómicas (CICVyA)-CNIA, Hurlingham, Argentina
| | - Romina Ayelén Sammarruco
- Instituto de Patobiología Veterinaria (IPVET), UEDD CONICET-INTA, Instituto Nacional de Tecnología Agropecuaria (INTA), INTA-CONICET, Hurlingham, Argentina
| | - Victoria Ruiz Menna
- Instituto de Patobiología Veterinaria (IPVET), UEDD CONICET-INTA, Instituto Nacional de Tecnología Agropecuaria (INTA), INTA-CONICET, Hurlingham, Argentina
| | - Carlos Javier Garro
- Instituto de Patobiología Veterinaria (IPVET), UEDD CONICET-INTA, Instituto Nacional de Tecnología Agropecuaria (INTA), INTA-CONICET, Hurlingham, Argentina
| | - Fernando Delgado
- Instituto de Patobiología Veterinaria (IPVET), UEDD CONICET-INTA, Instituto Nacional de Tecnología Agropecuaria (INTA), INTA-CONICET, Hurlingham, Argentina
| | - Analía Macías
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Río Cuarto, Argentina
| | - Gabriel Magnano
- Departamento de Patología Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Río Cuarto, Argentina
| | - Martín José Zumárraga
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo) UEDD CONICET-INTA, Centro de Investigación en Ciencias Veterinarias y Agronómicas (CICVyA)-CNIA, Hurlingham, Argentina
| | - Sergio Gabriel Garbaccio
- Instituto de Patobiología Veterinaria (IPVET), UEDD CONICET-INTA, Instituto Nacional de Tecnología Agropecuaria (INTA), INTA-CONICET, Hurlingham, Argentina
| | - María Emilia Eirin
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo) UEDD CONICET-INTA, Centro de Investigación en Ciencias Veterinarias y Agronómicas (CICVyA)-CNIA, Hurlingham, Argentina
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Wangmo K, Gurung RB, Choden T, Letho S, Pokhrel N, Lungten L, Zangmo T, Peldon S, Chedup K, Kumar SJ, Dorji T, Tshering S, Dorji K, Tenzin T. Seroprevalence and risk factors associated with bovine tuberculosis in cattle in Eastern Bhutan. PLoS Negl Trop Dis 2024; 18:e0012223. [PMID: 38805568 PMCID: PMC11161125 DOI: 10.1371/journal.pntd.0012223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 06/07/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024] Open
Abstract
Bovine tuberculosis (bTB) is a chronic zoonotic disease affecting cattle of all age groups including wild animals. It poses a significant threat to public health and high economic losses to dairy farmers. While the disease has been eradicated from most of the developed countries through extensive surveillance, testing and culling strategy, it is endemic in Africa, Asia, and the Middle East countries. Currently, there is limited research regarding the prevalence of bTB in cattle in Bhutan. This study aimed to determine the seroprevalence of bTB in cattle in six districts of eastern Bhutan. A two-stage probability proportional to size (PPS) sampling strategy was used to determine the number of animals from which serum samples needed to be collected in each district and sub-district. All farms and cattle for sampling were randomly selected from the data in the annual livestock census of 2020. The samples were tested using bTB ELISA test kit. The seroprevalence and their 95% confidence intervals were calculated. Logistic regression models were constructed to assess the influence of various individual animal and environmental risk factors (breed, age, sex, source of animal, body condition scores of animals, respiratory system status) associated with sero-positivity in animals. The study revealed an apparent seroprevalence of 2.57% (25/971 cattle; 95% CI:1.58-3.57), with an estimated true seroprevalence of 0.91% (95% CI: 0.0-2.81). However, none of the variables were found to be significantly associated with bTB seroprevalence in cattle. We recommend, further sampling and employment of confirmatory testing to fully ascertain the extent of bTB in the cattle herds in eastern Bhutan for prevention and control.
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Affiliation(s)
- Karma Wangmo
- Regional Livestock Development Centre, Department of Livestock, Khangma, Trashigang, Bhutan
| | - Ratna B Gurung
- National Centre for Animal Health, Department of Livestock, Thimphu, Bhutan
| | - Tshering Choden
- District Veterinary Hospital, Department of Livestock, Lhuentse, Bhutan
| | - Sangay Letho
- Regional Livestock Development Centre, Department of Livestock, Khangma, Trashigang, Bhutan
| | - Narayan Pokhrel
- District Veterinary Hospital, Department of Livestock, Mongar, Bhutan
| | - Lungten Lungten
- Regional Livestock Development Centre, Department of Livestock, Khangma, Trashigang, Bhutan
| | - Tashi Zangmo
- Regional Livestock Development Centre, Department of Livestock, Khangma, Trashigang, Bhutan
| | - Sonam Peldon
- National Centre for Animal Health, Department of Livestock, Thimphu, Bhutan
| | - Kinzang Chedup
- District Veterinary Hospital, Department of Livestock, Samdrup Jongkhar, Bhutan
| | | | - Thinley Dorji
- Kanglung Hospital, Ministry of Health, Trashigang, Bhutan
| | - Sangay Tshering
- Trashiyangtse hospital, Ministry of Health, Trashiyangtse, Bhutan
| | - Kinzang Dorji
- Eastern Regional Referral Hospital, Ministry of Health, Mongar, Bhutan
| | - Tenzin Tenzin
- National Centre for Animal Health, Department of Livestock, Thimphu, Bhutan
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O’Brien A, Hayton A, Cutler K, Adler A, Shaw DJ, Clarke J, Watt N, Harkiss GD. Diagnostic accuracy of the Enferplex Bovine TB antibody test using individual milk samples from cattle. PLoS One 2024; 19:e0301609. [PMID: 38687765 PMCID: PMC11060599 DOI: 10.1371/journal.pone.0301609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/19/2024] [Indexed: 05/02/2024] Open
Abstract
Bovine tuberculosis is usually diagnosed using tuberculin skin tests or at post-mortem. Recently, we have developed a serological test for bovine tuberculosis in cattle which shows a high degree of accuracy using serum samples. Here, we have assessed the performance of the test using individual bovine milk samples. The diagnostic specificity estimate using the high sensitivity setting of the test was 99.7% (95% CI: 99.2-99.9). This estimate was not altered significantly by tuberculin boosting. The relative sensitivity estimates of the test using the high sensitivity setting in milk samples from comparative skin test positive animals was 90.8% (95% CI: 87.1-93.6) with boosting. In animals with lesions, the relative sensitivity was 96.0% (95% CI: 89.6-98.7). Analysis of paired serum and milk samples from skin test positive animals showed correlation coefficients ranging from 0.756-0.955 for individual antigens used in the test. Kappa analysis indicated almost perfect agreement between serum and milk results, while McNemar marginal homogeneity analysis showed no statistically significant differences between the two media. The positive and negative likelihood ratio were 347.8 (95% CI: 112.3-1077.5) and 0.092 (95% CI: 0.07-0.13) respectively for boosted samples from skin test positive animals. The results show that the test has high sensitivity and specificity in individual milk samples and thus milk samples could be used for the diagnosis of bovine tuberculosis.
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Affiliation(s)
| | | | - Keith Cutler
- Synergy Farm Health, Maiden Newton, Dorset, United Kingdom
| | - Andy Adler
- Synergy Farm Health, Maiden Newton, Dorset, United Kingdom
| | - Darren J. Shaw
- Royal (Dick) School of Veterinary Studies & The Roslin Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - John Clarke
- Enfer Scientific, Naas, County Kildare, Ireland
| | - Neil Watt
- MV Diagnostics Ltd, Roslin Innovation Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Gordon D. Harkiss
- MV Diagnostics Ltd, Roslin Innovation Centre, University of Edinburgh, Edinburgh, United Kingdom
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Vera-Salmoral E, Sánchez-Carvajal JM, Gómez-Gascón L, Larenas-Muñoz F, Tarradas C, Gómez-Laguna J, Huerta B. Assessment of the diagnostic performance of intradermal tuberculin test and post-mortem inspection for the diagnosis of bovine tuberculosis according to WOAH guidelines. Res Vet Sci 2024; 168:105159. [PMID: 38266351 DOI: 10.1016/j.rvsc.2024.105159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/17/2024] [Accepted: 01/19/2024] [Indexed: 01/26/2024]
Abstract
Bovine tuberculosis (bTB) constitutes a global challenge for public and animal health with still some deficiencies regarding its diagnosis. This study aimed to estimate the accuracy of the single intradermal tuberculin test (SIT) and post-mortem inspection for different diagnostic objectives following WOAH guidelines. Tissue samples from 59 microbiological culture/PCR-positive and 58 microbiological culture/PCR-negative cattle were evaluated. The diagnostic sensitivity and specificity, the positive and negative probability indices as well as the positive and negative predictive values (PPV and NPV) of each technique were estimated for different pretest probabilities. The SIT with strict interpretation demonstrated moderate precision in confirming the absence of infection in populations historically free of bTB, with a 12.1% rate of false positives, but also detecting positive animals in the early stage of the eradication programs, with a 13.6% rate of false negatives. The diagnostic performance for ruling out bTB was notably high (NPV > 90%) in animals with a pre-test probability (PTP) below 42%. Post-mortem inspection constituted an interesting alternative tool to confirm suspected and positive cases for SIT, particularly in areas with bTB prevalence exceeding 19%, where implementing SIT and eradication measures may be impractical. In these areas, the likelihood that animals with tuberculosis-like lesions are affected by the disease surpasses 90%. Similarly, in herds with a PTP below 25%, the absence of bTB could be confidently ruled out with over 90% certainty. These findings highlight the effectiveness of SIT and post-mortem inspection as valuable techniques for current eradication programs and controlling bTB in high-prevalence areas where molecular techniques may not be feasible.
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Affiliation(s)
- Eduardo Vera-Salmoral
- Department of Animal Health, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', University of Córdoba, 14014 Córdoba, Spain; Department of Anatomy and Comparative Pathology and Toxicology, Pathology and Immunology Group (UCO-PIG), UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', 14014 Córdoba, Spain
| | - José María Sánchez-Carvajal
- Department of Anatomy and Comparative Pathology and Toxicology, Pathology and Immunology Group (UCO-PIG), UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', 14014 Córdoba, Spain.
| | - Lidia Gómez-Gascón
- Department of Animal Health, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', University of Córdoba, 14014 Córdoba, Spain
| | - Fernanda Larenas-Muñoz
- Department of Anatomy and Comparative Pathology and Toxicology, Pathology and Immunology Group (UCO-PIG), UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', 14014 Córdoba, Spain
| | - Carmen Tarradas
- Department of Animal Health, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', University of Córdoba, 14014 Córdoba, Spain
| | - Jaime Gómez-Laguna
- Department of Anatomy and Comparative Pathology and Toxicology, Pathology and Immunology Group (UCO-PIG), UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', 14014 Córdoba, Spain
| | - Belén Huerta
- Department of Animal Health, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus 'CeiA3', University of Córdoba, 14014 Córdoba, Spain
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Velasco C, Ortega J, Ricón J, Romero B, de Juan L, Domínguez L, Domínguez M, Moreno I, Álvarez J, Bezos J. Effect of a recent intradermal test on the specificity of P22 ELISA for the diagnosis of caprine tuberculosis. Front Vet Sci 2024; 11:1358413. [PMID: 38389583 PMCID: PMC10881819 DOI: 10.3389/fvets.2024.1358413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 01/24/2024] [Indexed: 02/24/2024] Open
Abstract
Caprine tuberculosis (TB) is a zoonotic disease caused by members of the Mycobacterium tuberculosis complex. TB eradication programs in goats are based on the single and comparative intradermal tuberculin tests (SITT and CITT, respectively). Antibody-based diagnostic techniques have emerged as potential diagnostic tools for TB. P22 ELISA has been previously evaluated using samples collected after the intradermal tuberculin tests to maximize the sensitivity, a phenomenon known as booster effect. However, there is no information available on whether the use of this diagnostic strategy could lead to a decrease of its specificity (Sp). The aim of the present study was to elucidate the interference effect of a recent CITT on the Sp of the P22 ELISA in serum and milk samples collected at different times after the CITT from a TB-free herd (n = 113). The number of reactors to P22 ELISA was significantly higher (p < 0.01) on serum samples collected 15 days post-CITT compared to day 0, showing a decrease in Sp from 99.1% (95% CI; 95.2-99.8%) to 88.5% (95% CI; 81.3-93.2%). The number of reactors and the quantitative values of P22 ELISA were significantly higher (p < 0.01) in serum samples compared to milk. No significant (p > 0.05) changes in the Sp of the P22 ELISA were observed throughout the different time samplings using milk No significant (p > 0.05) changes were observed on days 30 and 60 post-CITT. In conclusion, the booster effect strategy may significantly decrease the Sp of P22 ELISA in TB-free herds when serum samples are used but not when milk is tested.
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Affiliation(s)
- Carlos Velasco
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Javier Ortega
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Jaime Ricón
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Beatriz Romero
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Lucía de Juan
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
| | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
| | - Julio Álvarez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
- Facultad de Veterinaria, Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
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9
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Juste RA, Fernández-Veiga L, Fuertes M, Fernández-Ortiz de Murua I, Cardona G, Geijo MV, Garrido JM, Sevilla IA. A humoral diagnostic test outperforms cellular tests in a farm with a latent tuberculosis outbreak caused by a new Mycobacterium tuberculosis complex spoligotype that affected sheep but not goats. Front Vet Sci 2024; 10:1310205. [PMID: 38317788 PMCID: PMC10839146 DOI: 10.3389/fvets.2023.1310205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 12/26/2023] [Indexed: 02/07/2024] Open
Abstract
Tuberculosis (TB) is a disease caused by members of the M. tuberculosis complex (MTC) that affects numerous species. M. caprae, a member of the complex which is close to M. bovis, is emerging and affects several different hosts that include goats, cattle, sheep, pigs, rabbits, wild boar, red deer, foxes and also humans. A new M. caprae spoligotype (SB2737) was isolated from an outbreak of sheep tuberculosis affecting a mixed sheep (323)-goat (29) farm in 2021. The index case was detected by the La Rioja slaughterhouse veterinary inspection. Tracing back to the farm of origin, both species were submitted to Comparative Intradermal Tuberculin Test (CITT) and M. bovis-specific antibody ELISA tests. A subsample was also examined by IFN-γ release assay (IGRA) and all positives were slaughtered and pathologically and microbiologically investigated. Only 1.2% of sheep and no goat were positive in the CITT, and 11.4% in the IGRA sheep subsample, while up to 36.8% were positive in two consecutive M. bovis-specific antibody ELISA tests. Goats had always tested negative in annual intradermal follow-up since 2013. Upon confirmation of the immunologically positive sheep at slaughter, all the remaining negative animals were killed and 29.2% of sheep were still found infected. This raised the final overall prevalence to 37.5%. Antibody ELISA was the most sensitive (81.4%) in vivo detection method still showing a 85.0% specificity relative to pathological and microbiological tuberculosis status. It was nearly 10 times more sensitive than skin test and had an 86.8% positive predictive value. Notwithstanding a possible singular pathogenesis of the new spoligotype, this outbreak adds up to previous reports suggesting that sheep tuberculosis could be huge reservoir of infection worldwide overlooked by skin test low sensitivity or simply lack of investigation. This makes it urgent to extend the use antibody tests to address the Trojan horse of hidden M. tuberculosis complex infections on bovine TB control programs.
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Affiliation(s)
- Ramon A. Juste
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Leire Fernández-Veiga
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Miguel Fuertes
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | | | - Guillermo Cardona
- Servicio de Ganadería, Diputacion Foral de Alava, Vitoria-Gasteiz, Spain
| | - Maria V. Geijo
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Joseba M. Garrido
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
| | - Iker A. Sevilla
- Animal Health Department, NEIKER – Basque Institute for Agricultural Research and Development, Basque Research and Technology Alliance (BRTA), Derio, Spain
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Moens C, Filée P, Boes A, Alie C, Dufrasne F, André E, Marché S, Fretin D. Identification of New Mycobacterium bovis antigens and development of a multiplexed serological bead-immunoassay for the diagnosis of bovine tuberculosis in cattle. PLoS One 2023; 18:e0292590. [PMID: 37812634 PMCID: PMC10561873 DOI: 10.1371/journal.pone.0292590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 09/25/2023] [Indexed: 10/11/2023] Open
Abstract
Serological assays for bovine tuberculosis diagnosis require the use of multiple Mycobacterium bovis specific antigens to ensure the detection of infected animals. In the present study, identification and selection process of antigens, based on data from published proteomic studies and involving the use of bioinformatics tools and an immuno-screening step, was firstly performed for identifying novel antigens that elicit an antibody response in M. bovis infection. Based on this approach, a panel of 10 M. bovis antigens [with known relevance (MPB70, MPB83, MPB70/83, and ESAT6/CFP10) and novel (Mb1961c, Mb1301c, Mb3871, Mb1403, Mb0592, and PE25/PPE41)] were constructed and thenused to develop a new multiplexed serological assay based on Luminex technology. The performance of the Luminex-bTB immunoassay was evaluated using sera from cattle with known tuberculosis status. Among the proteins whose ability to detect bovine tuberculosis was evaluated for the first time, PE25/PPE41 and Mb1403, but not Mb3871, showed good detection capacity. Following multiple antigen combination, the final Luminex-bTB immunoassay included seven antigens (MPB70, MPB83, MPB70/83, ESAT6/CFP10, PE25/PPE41, Mb1403, and Mb0592) and showed better global performance than the immunoassay using the four usual antigens (MPB70, MPB70/83, MPB83 and ESAT6/CFP10). The specificity and sensitivity values were, respectively, of 97.6% and 42.8% when the cut-off of two-positive antigens was used to classify samples as positive. With the use of the more-restrictive criterion of three-positive antigens, the specificity increased to 99.2% but the sensitivity decreased to 23.9%. The analysis of antigen profiles generated with the Luminex-bTB immunoassay showed that mainly serodominant proteins were recognized in samples from infected cattle. The detection of Mb1961c and Mb1301c appeared to be associated with presumed false-positive results. Moreover, sera from cattle originating from bTB-outbreaks but having inconclusive or negative skin test results were identified as positive by the Luminex-bTB immunoassay and showed an antigen pattern associated with M. bovis infection. The Luminex-bTB immunoassay including seven antigens may be useful as adjunct test for the detection of M. bovis-infected herds, and different cut-offs could be applied according to the bovine tuberculosis epidemiological context.
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Affiliation(s)
- Charlotte Moens
- Department of Animal Infectious Diseases, Laboratory of Veterinary Bacteriology, National Institute for Public Health (Sciensano), Brussels, Belgium
- Laboratory of Biochemistry and Genetics of Microorganisms, Louvain Institute of Biomolecular Science and Technology, UCLouvain, Louvain-la-Neuve, Belgium
| | - Patrice Filée
- Laboratory of Immuno-Biology, CER Groupe, Aye, Belgium
| | - Adrien Boes
- Laboratory of Immuno-Biology, CER Groupe, Aye, Belgium
| | | | - François Dufrasne
- Department of Human Infectious Diseases, Laboratory of Viral Diseases, National Institute for Public Health (Sciensano), Brussels, Belgium
| | - Emmanuel André
- Department of Microbiology, Immunology and Transplantation, Laboratory of Clinical Microbiology, KU Leuven, Leuven, Belgium
| | - Sylvie Marché
- Department of Animal Infectious Diseases, Laboratory of Veterinary Bacteriology, National Institute for Public Health (Sciensano), Brussels, Belgium
| | - David Fretin
- Department of Animal Infectious Diseases, Laboratory of Veterinary Bacteriology, National Institute for Public Health (Sciensano), Brussels, Belgium
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11
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Moens C, Saegerman C, Fretin D, Marché S. Performance of two commercial serological assays for bovine tuberculosis using plasma samples. Vet Immunol Immunopathol 2023; 263:110644. [PMID: 37603920 DOI: 10.1016/j.vetimm.2023.110644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 06/16/2023] [Accepted: 08/09/2023] [Indexed: 08/23/2023]
Abstract
In the bovine tuberculosis diagnosis, the use of plasma samples (already available for IFNɣ assays) in serological tests might facilitate the work in the field. Here, the performance of two commercial serological tests (ELISA IDEXX M. bovis Ab test and Enferplex Bovine TB antibody test) were evaluated using plasma samples from cattle in Belgium. Specificity values estimated from 567 plasma samples collected from bTB-free cattle were 98.4% when using the ELISA IDEXX M. bovis Ab test, and were 96.5% and 93.3% when using the high specificity and high sensitivity settings of the Enferplex Bovine TB antibody test, respectively. Sensitivity values were calculated relative to SICCT-positive (N = 117) and IFNɣ-positive (N = 132) animals originating from M. bovis-infected herds. Overall, the multiplexed Enferplex Bovine TB antibody test had better sensitivity (mean: 32.5% and 43.4% for the high specificity and sensitivity settings, respectively) compared to the ELISA IDEXX M. bovis Ab test (mean: 12%). Data obtained from plasma samples in the current study were compared to a previous study using both serological tests with sera. In conclusion, both serological tests showed comparable performance with both matrix; although overall specificity values with the Enferplex Bovine TB antibody test were lower when using plasma samples than sera.
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Affiliation(s)
- Charlotte Moens
- Veterinary Bacteriology Service, Sciensano, B-1040 Brussels, Belgium; Louvain Institute of Biomolecular Science and Technology, Université Catholique de Louvain, B-1048 Louvain-la-Neuve, Belgium.
| | - Claude Saegerman
- Research Unit in Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULiège), Fundamental and Applied Research for Animal and Health (FARAH) Center, University of Liège, B-4000 Liège, Belgium
| | - David Fretin
- Veterinary Bacteriology Service, Sciensano, B-1040 Brussels, Belgium
| | - Sylvie Marché
- Veterinary Bacteriology Service, Sciensano, B-1040 Brussels, Belgium
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12
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Barton P, Robinson N, Middleton S, O’Brien A, Clarke J, Dominguez M, Gillgan S, Selmes J, Rhodes S. Evaluation of Antibody Tests for Mycobacterium bovis Infection in Pigs and Deer. Vet Sci 2023; 10:489. [PMID: 37624276 PMCID: PMC10458400 DOI: 10.3390/vetsci10080489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/19/2023] [Accepted: 07/21/2023] [Indexed: 08/26/2023] Open
Abstract
This study addressed the need in Great Britain for supplementary blood tests for deer and pig herds under movement restrictions due to confirmed Mycobacterium bovis infection-to enhance the overall sensitivity and reliability of tuberculosis (TB) testing and contribute to an exit strategy for these herds. We evaluated four antibody tests (lateral flow DPP VetTB Assay for Cervids, M. bovis IDEXX ELISA, Enferplex Cervid and Porcine antibody tests and an in-house comparative PPD ELISA) using serum samples from defined cohorts of TB-infected and TB-free deer and pigs. TB-infected deer included two separate cohorts; farmed deer that had received a tuberculin skin test less than 30 days prior, and park deer that had received no prior skin test. In this way, we were able to assess the effect of the skin test anamnestic boost upon antibody test sensitivity. We tested a total of 402 TB-free pigs and 416 TB-free deer, 77 infected farmed deer and 105 infected park deer, and 29 infected pigs (including 2 wild boar). For deer, we found an equivalent high performance of all four tests: specificity range 98.8-99.5% and sensitivity range 76.6-85.7% for skin test-boosted infected deer, and 51.4-58.1% for non-boosted infected deer. These data suggest an overall approximate 25% increase in test sensitivity for infected deer following a skin test boost. For pigs, the tests again had equivalent high specificity of 99-99.5% and a sensitivity range of 62.1-86.2%, with substantial agreement for three of the four tests. Retrospective application of the ELISA tests to individual culled park deer and wild boar that showed no obvious evidence of TB at larder inspection identified a significant seropositivity within wild boar suggestive of low-level M. bovis infection that would otherwise not have been detected. Overall this investigation provided a robust evaluation of four antibody tests, which is essential to generate confidence in test performance before a wider deployment within TB control measures can be considered.
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Affiliation(s)
- Penny Barton
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - Nick Robinson
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - Sonya Middleton
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - Amanda O’Brien
- Enfer Scientific, W91 FD74 Naas, County Kildare, Ireland; (A.O.); (J.C.)
| | - John Clarke
- Enfer Scientific, W91 FD74 Naas, County Kildare, Ireland; (A.O.); (J.C.)
| | - Maria Dominguez
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - Steve Gillgan
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - John Selmes
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
| | - Shelley Rhodes
- Animal and Plant Health Agency (APHA), Weybridge KT15 3NB, UK; (P.B.); (N.R.); (S.M.); (M.D.); (S.G.); (J.S.)
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13
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Moens C, Saegerman C, Fretin D, Marché S. Field evaluation of two commercial serological assays for detecting bovine tuberculosis. Res Vet Sci 2023; 159:125-132. [PMID: 37126914 DOI: 10.1016/j.rvsc.2023.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/03/2023] [Accepted: 04/11/2023] [Indexed: 05/03/2023]
Abstract
Diagnosis of bovine tuberculosis in cattle is challenging due to complex immune host response to infection that limit the performance of available diagnostic tests. In this study, performance of two commercial serological assays developed to detect bovine tuberculosis were evaluated: Enferplex Bovine TB antibody kit including 11 antigens (EnferGroup, Ireland) and IDEXX M. bovis Ab kit (IDEXX, USA). The specificity value obtained with the ELISA IDEXX M. bovis Ab test was 97.1%, whereas it was 97.1% and 95.1% for the high specificity and sensitivity settings, respectively, with the Enferplex Bovine TB antibody kit. The sensitivity of the multiplexed Enferplex Bovine TB antibody test for SICCT-positive animals was higher (N = 172; 51.7% and 58.7% with high specificity and sensitivity settings, respectively) compared to the ELISA IDEXX M. bovis Ab test (sensitivity of 36.6%). "Antigen profiles" generated by the multiplexed Enferplex method showed that five out of 11 antigens present in the test were mostly identified as positive sera in cattle originating from bTB-outbreaks. In comparison, unique profiles appeared to be correlated with false positive results. However additional studies are needed to confirm the observed antigen profiles, and their potential use as an additional diagnostic tool. Serial interpretation of the two serological tests produced higher diagnostic specificity (>99%), reducing false positive results, which is essential for a screening test when the prevalence of bovine tuberculosis is low.
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Affiliation(s)
- Charlotte Moens
- Veterinary Bacteriology Service, Sciensano, Brussels B-1050, Belgium; Louvain Institute of Biomolecular Science and Technology, Université Catholique de Louvain, Louvain-la-Neuve B-1348, Belgium
| | - Claude Saegerman
- Research Unit in Epidemiology and Risk Analysis Applied to Veterinary Sciences (UREAR-ULiège), Fundamental and Applied Research for Animal and Health (FARAH) Center, University of Liège, Liège B-4000, Belgium
| | - David Fretin
- Veterinary Bacteriology Service, Sciensano, Brussels B-1050, Belgium
| | - Sylvie Marché
- Veterinary Bacteriology Service, Sciensano, Brussels B-1050, Belgium.
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Caldow GL, Douglas L, Thacker J, Mackay E, Berezowski J. Estimation of the specificity of an antibody ELISA for paratuberculosis generated from a sector of the UK cattle population using results from a paratuberculosis control programme. Prev Vet Med 2023; 215:105910. [PMID: 37054518 DOI: 10.1016/j.prevetmed.2023.105910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 03/17/2023] [Accepted: 04/03/2023] [Indexed: 04/05/2023]
Abstract
In the United Kingdom (UK) a voluntary programme to control paratuberculosis in cattle based on herd management and serological screening has been operating since 1998. The programme assigns a risk level to each participating herd according to the within herd seroprevalence and the confirmation of the presence of infection with Mycobacterium avium subspecies paratuberculosis (MAP) by faecal culture or polymerase chain reaction (PCR). From the outset a general concern over the specificity of the paratuberculosis antibody enzyme-linked immunosorbent assay (ELISA) resulted in the use of a faecal screen for the causal organism to negate or confirm infection in individual seropositive animals. Progress in improving the diagnostic tests has been gradual throughout the life of the programme and the under-pinning approach to using tests to determine the risk of paratuberculosis for a herd required to be re-examined. This study used a large data set of more than 143,000 test results over five years from the lowest paratuberculosis risk level category of herds to estimate the specificity of a commercially available paratuberculosis antibody ELISA for cattle. In each year of the study the estimated specificity reached or exceeded 0.998. We also examined the apparent impact that annual or more frequent application of the single intradermal comparative cervical tuberculin (SICCT) test for tuberculosis (TB), using purified protein derivatives of Mycobacterium bovis and Mycobacterium avium subspecies avium, had on specificity of the antibody ELISA for paratuberculosis. We found a statistically significant difference in three of the five years with herds that were officially tuberculosis free and not subject to frequent SICCT testing. This difference was small and considered to be of little practical importance for the paratuberculosis assurance programme. We concluded that, in the UK the mandatory TB surveillance programme of cattle herds is not a limiting factor in the use of serological testing to support herd-level assurance schemes for paratuberculosis. Furthermore, in paratuberculosis, where shedding of MAP is intermittent and the sensitivity of the commercially available PCR tests for detection MAP is highly variable, faecal screening of seropositive animals is an unreliable method for negating infection in seropositive cattle.
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15
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Chen Y, Cheng S, Wang Y, Wang G, Wu X, Robertson ID, Guo A. Evaluation and application of a milk antibody ELISA for assessing the prevalence and incidence of bovine tuberculosis in dairy herds in Hubei Province, China. ANIMAL DISEASES 2023. [DOI: 10.1186/s44149-023-00069-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
Abstract
AbstractBovine tuberculosis (bTB) is a chronic zoonotic disease that is endemic in China. Current in-vitro tests for bTB are mainly based on blood assays. Collection of samples results in some stress to the sampled cattle and associated economic losses for the herd owner. This study was designed to investigate the relationship between milk and serum antibody tests for bTB in dairy cows using 85 cows with milk and corresponding blood samples. Totally 4,395 milk samples were used to assesse the apparent (test) prevalence and incidence of bTB using the milk antibody ELISA. The association between levels of bTB milk antibody and milk quality was also evaluated. Milk and serum antibody tests showed a good correlation with a 87.5% (95% CI: 61.7%, 98.4) positive agreement and 98.7% (95% CI: 95.4, 99.8) negative agreement. The animal level lactoprevalence ranged from 0.3% (95% CI: 0, 1.2) to 33.3% (95% CI: 26.6, 40.6) in different farms and the incidence rate ranged from 0 head/cow-month (95% CI: 0, 0.02) to 0.04 head/cow-month (95% CI: 0.02, 0.07). Twenty percent of sampled farms met the criteria for bTB control in China. The prevalence on large-scale farms was lower (p < 0.001) than on small farms. The bTB milk antibody levels had a negative correlation with milk yield and a positive correlation with somatic cell count (SCC), milk protein percentage (MPP) and percentage of total solids (TS). According to this research, milk ELISA could be used as a supplement of blood samples to assist in the surveillance for bTB and for alerting control and eradication of bTB.
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16
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Accuracy of Tests for Diagnosis of Animal Tuberculosis: Moving Away from the Golden Calf (and towards Bayesian Models). Transbound Emerg Dis 2023. [DOI: 10.1155/2023/7615716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The last decades have seen major efforts to develop new and improved tools to maximize our ability to detect tuberculosis-infected animals and advance towards the objective of disease control and ultimately eradication. Nevertheless, there is still uncertainty regarding test performance due to the wide range of specificity and especially sensitivity estimates published in the scientific literature. Here, we performed a systematic review of the literature on studies that evaluated the performance of tuberculosis diagnostic tests used in animals through Bayesian Latent Class Models (BLCMs), which do not require the application of a (fallible) reference procedure to classify animals as infected with tuberculosis or not. BLCM-based sensitivity and specificity estimates deviated from those obtained using a reference procedure for certain antemortem tests: an overall lower sensitivity of skin tests and serology and a higher sensitivity of interferon-gamma (IFN-γ) assays was reported. In the case of postmortem diagnostic tests, sensitivity estimates from BLCMs were similar to estimates from studies based on other methodologies. For specificity, the range of BLCM-based estimates was narrower than those based on a reference test, reaching values close to 100% (but lower in the case of IFN-γ assays). In conclusion, Bayesian methods have been increasingly applied for the evaluation of tuberculosis diagnostic tests in animals, yielding results that differ (sometimes substantially) from previously reported test performance in the literature, particularly for in vivo tests and sensitivity estimates. Newly developed models that allow adjustment for relevant factors (e.g., age, breed, region, and herd size) can contribute to the generation of more unbiased estimates of test performance. Nevertheless, although BLCMs for tuberculosis do not require the use of an imperfect reference procedure and are therefore not influenced by its limited performance, they require careful implementation, and transparent systematic reporting should be the norm.
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Diagnostic accuracy of the Enferplex Bovine Tuberculosis antibody test in cattle sera. Sci Rep 2023; 13:1875. [PMID: 36726018 PMCID: PMC9892036 DOI: 10.1038/s41598-023-28410-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 01/18/2023] [Indexed: 02/03/2023] Open
Abstract
Bovine tuberculosis is a contagious bacterial disease of worldwide economic, zoonotic and welfare importance caused mainly by Mycobacterium bovis infection. Current regulatory diagnostic methods lack sensitivity and require improvement. We have developed a multiplex serological test for bovine tuberculosis and here we provide an estimate of the diagnostic accuracy of the test in cattle. Positive and negative reference serum samples were obtained from animals from Europe and the United States of America. The diagnostic specificity estimate was 98.4% and 99.7% using high sensitivity and high specificity settings of the test respectively. Tuberculin boosting did not affect the overall specificity estimate. The diagnostic sensitivity in samples from Mycobacterium bovis culture positive animals following tuberculin boosting was 93.9%.The relative sensitivity following boosting in tuberculin test positive, lesion positive animals and interferon gamma test positive, lesion positive animals was 97.2% and 96.9% respectively. In tuberculin test negative, lesion positive animals and in interferon gamma test negative, lesion positive animals, the relative sensitivity following tuberculin boosting was 88.2% and 83.6% respectively. The results show that the test has high diagnostic sensitivity and specificity and can detect infected animals that are missed by tuberculin and interferon gamma testing.
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Buendia A, Sanchez J, Salinas J, Ortega N, Del Rio L, Navarro J. Evaluation of a commercial double-recognition ELISA for caprine tuberculosis diagnosis: Sensitivity, specificity, and correlation to macroscopic and microscopic lesions. Res Vet Sci 2022; 152:618-623. [DOI: 10.1016/j.rvsc.2022.09.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/16/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2022]
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Ortega J, de Juan L, Sevilla IA, Garrido JM, Roy Á, Velasco C, Romero B, Domínguez M, Pérez de Val B, Nebot C, Sáez-Llorente JL, Álvarez J, Bezos J. Effect of a recent parenteral dexamethasone and ketoprofen administration on the immunological diagnosis of tuberculosis in goats. Front Vet Sci 2022; 9:1042428. [DOI: 10.3389/fvets.2022.1042428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 10/28/2022] [Indexed: 11/11/2022] Open
Abstract
Caprine tuberculosis (TB) is a zoonosis caused by members of the Mycobacterium tuberculosis complex (MTBC). Caprine TB eradication programmes are based mainly on intradermal tuberculin tests and slaughterhouse surveillance. Different factors may affect the performance of the TB diagnostic tests used in caprine herds and, therefore, their ability to detect infected animals. The present study evaluates the effect of the fraudulent administration of two anti-inflammatory substances, dexamethasone and ketoprofen, on the performance of the TB diagnostic techniques used in goats, as well as the suitability of high performance liquid chromatography (HPLC) for their detection in hair samples. The animals (n = 90) were distributed in three groups: (1) a group treated with dexamethasone (n = 30); a second group treated with ketoprofen (n = 30); and a third non-treated control group (n = 30). Both dexamethasone and ketoprofen groups were subjected to intramuscular inoculation with the substances 48 h after the administration of bovine and avian purified protein derivatives (PPDs), that is, 24 h before the tests were interpreted. All the animals were subjected to the single and comparative intradermal tuberculin (SIT and CIT, respectively) tests, interferon-gamma release assay (IGRA) and P22 ELISA. The number of SIT test reactors was significantly lower in the dexamethasone (p = 0.001) and ketoprofen (p < 0.001) groups 72 h after the bovine PPD inoculation compared with the control group. A significantly higher number of positive reactors to IGRA was detected within the dexamethasone group (p = 0.016) 72 h after PPD administration compared to the control group. Dexamethasone and ketoprofen detection in either hair or serum samples was challenging when using HPLC since these substances were not detected in animals whose skin fold thickness (SFT) was reduced, what could be an issue if they are used for fraudulent purposes. In conclusion, the parenteral administration of dexamethasone or ketoprofen 48 h after the PPDs administration can significantly reduce the increase in SFT (mm) and subsequently the number of positive reactors to SIT test.
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Sridhara AA, Johnathan-Lee A, Elahi R, Lambotte P, Esfandiari J, Boschiroli ML, Kerr TJ, Miller MA, Holder T, Jones G, Vordermeier HM, Marpe BN, Thacker TC, Palmer MV, Waters WR, Lyashchenko KP. Differential detection of IgM and IgG antibodies to chimeric antigens in bovine tuberculosis. Vet Immunol Immunopathol 2022; 253:110499. [DOI: 10.1016/j.vetimm.2022.110499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/30/2022] [Accepted: 10/03/2022] [Indexed: 10/31/2022]
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21
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Cooke DM, Goosen WJ, Witte C, Miller MA. Field evaluation of the tuberculin skin test for the detection of Mycobacterium tuberculosis complex infection in communal goats (Capra hircus) in KwaZulu-Natal, South Africa. Vet Immunol Immunopathol 2022; 252:110486. [PMID: 36116328 DOI: 10.1016/j.vetimm.2022.110486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 08/15/2022] [Accepted: 09/10/2022] [Indexed: 11/30/2022]
Abstract
In South Africa, animal tuberculosis (TB) control programs predominantly focus on domestic cattle and African buffaloes (Syncerus caffer) despite increasing global reports of tuberculosis in goats (Capra hircus). Left undetected, Mycobacterium tuberculosis complex (MTBC) infected goats may hinder TB eradication efforts in cattle and increase zoonotic risk to humans. Since the publication of animal TB testing guidelines in 2018, prescribing the use of the tuberculin skin test (TST) for goats in South Africa by the Department of Agriculture, Land Reform, and Rural Development (DALRRD), there have been no published reports of any field application of the prescribed test criteria in goat herds. Therefore, this study aimed to evaluate the performance of these DALRRD guidelines using the single intradermal cervical tuberculin test (SICT) and the single intradermal comparative cervical tuberculin test (SICCT). Between October and December 2020, 495 goats from communal pastures of Kwa-Zulu Natal (KZN), where M. bovis infection has been identified in cattle and where cattle and goats cohabitate, were tested using the SICT and SICCT (M. bovis-exposed group). Additionally, 277 goats from a commercial Saanen dairy herd, with no history of M. bovis, were also tested (M. bovis-unexposed group). Estimated apparent prevalence of TST positive goats was determined based on published test interpretation criteria as described by DALRRD. When proportions of test-positive goats were compared between different DALRRD criteria, the ≥ 4 mm cut-off criterion for the SICCT resulted in the lowest proportion of positive results in the presumably uninfected group (1/277 positive in the unexposed group). The apparent prevalence of TB in the exposed group was estimated at 3.0% (95% CI: 1.7-4.9%), which is similar to previous reports of M. bovis prevalence in cattle from this area (6%). The detection of a significantly greater proportion of SICCT positive goats in the M. bovis-exposed group compared to the unexposed group suggests that MTBC infection is present in this population. Further investigations should be undertaken, in conjunction with confirmatory molecular tests, mycobacterial culture, and advanced pathogen sequencing to establish whether MTBC infection in domestic goats is a true under-recognized threat to the eradication of animal TB in South Africa.
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Affiliation(s)
- Deborah M Cooke
- Division of Molecular Biology and Human Genetics, South Africa; South African Medical Research Council Centre for Tuberculosis Research, South Africa; DSI-NRF Centre of Excellence for Biomedical Tuberculosis Research, South Africa.
| | - Wynand J Goosen
- Division of Molecular Biology and Human Genetics, South Africa; South African Medical Research Council Centre for Tuberculosis Research, South Africa; DSI-NRF Centre of Excellence for Biomedical Tuberculosis Research, South Africa.
| | - Carmel Witte
- Division of Molecular Biology and Human Genetics, South Africa; South African Medical Research Council Centre for Tuberculosis Research, South Africa; DSI-NRF Centre of Excellence for Biomedical Tuberculosis Research, South Africa; Conservation Science Wildlife Health, San Diego Zoo Wildlife Alliance, San Diego, CA, United States.
| | - Michele A Miller
- Division of Molecular Biology and Human Genetics, South Africa; South African Medical Research Council Centre for Tuberculosis Research, South Africa; DSI-NRF Centre of Excellence for Biomedical Tuberculosis Research, South Africa.
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22
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Evaluation of an ELISA for the diagnosis of bovine tuberculosis using milk samples from dairy cows in China. Prev Vet Med 2022; 208:105752. [DOI: 10.1016/j.prevetmed.2022.105752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/11/2022] [Accepted: 08/29/2022] [Indexed: 11/19/2022]
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23
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Borham M, Oreiby A, El-Gedawy A, Hegazy Y, Khalifa HO, Al-Gaabary M, Matsumoto T. Review on Bovine Tuberculosis: An Emerging Disease Associated with Multidrug-Resistant Mycobacterium Species. Pathogens 2022; 11:pathogens11070715. [PMID: 35889961 PMCID: PMC9320398 DOI: 10.3390/pathogens11070715] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/16/2022] [Accepted: 06/18/2022] [Indexed: 12/26/2022] Open
Abstract
Bovine tuberculosis is a serious infectious disease affecting a wide range of domesticated and wild animals, representing a worldwide economic and public health burden. The disease is caused by Mycobacteriumbovis and infrequently by other pathogenic mycobacteria. The problem of bovine tuberculosis is complicated when the infection is associated with multidrug and extensively drug resistant M. bovis. Many techniques are used for early diagnosis of bovine tuberculosis, either being antemortem or postmortem, each with its diagnostic merits as well as limitations. Antemortem techniques depend either on cellular or on humoral immune responses, while postmortem diagnosis depends on adequate visual inspection, palpation, and subsequent diagnostic procedures such as bacterial isolation, characteristic histopathology, and PCR to reach the final diagnosis. Recently, sequencing and bioinformatics tools have gained increasing importance for the diagnosis of bovine tuberculosis, including, but not limited to typing, detection of mutations, phylogenetic analysis, molecular epidemiology, and interactions occurring within the causative mycobacteria. Consequently, the current review includes consideration of bovine tuberculosis as a disease, conventional and recent diagnostic methods, and the emergence of MDR-Mycobacterium species.
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Affiliation(s)
- Mohamed Borham
- Bacteriology Department, Animal Health Research Institute Matrouh Lab, Matrouh 51511, Egypt;
| | - Atef Oreiby
- Department of Animal Medicine (Infectious Diseases), Faculty of Veterinary Medicine, Kafrelsheikh University, Kafr El-Sheik 33516, Egypt; (A.O.); (Y.H.); (M.A.-G.)
| | - Attia El-Gedawy
- Bacteriology Department, Animal Health Research Institute, Giza 12618, Egypt;
| | - Yamen Hegazy
- Department of Animal Medicine (Infectious Diseases), Faculty of Veterinary Medicine, Kafrelsheikh University, Kafr El-Sheik 33516, Egypt; (A.O.); (Y.H.); (M.A.-G.)
| | - Hazim O. Khalifa
- Department of Infectious Diseases, Graduate School of Medicine, International University of Health and Welfare, Narita 286-0048, Japan
- Department of Pharmacology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Higashimurayama, Tokyo 189-0002, Japan
- Correspondence: (H.O.K.); (T.M.)
| | - Magdy Al-Gaabary
- Department of Animal Medicine (Infectious Diseases), Faculty of Veterinary Medicine, Kafrelsheikh University, Kafr El-Sheik 33516, Egypt; (A.O.); (Y.H.); (M.A.-G.)
| | - Tetsuya Matsumoto
- Department of Infectious Diseases, Graduate School of Medicine, International University of Health and Welfare, Narita 286-0048, Japan
- Correspondence: (H.O.K.); (T.M.)
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Sridhara AA, Johnathan-Lee A, Elahi R, Sikar-Gang A, Lambotte P, Esfandiari J, de Juan L, Gortazar C, Marpe BN, Thacker TC, Palmer MV, Waters WR, Lyashchenko KP. Potential for improved detection of bovine tuberculosis by targeting combined blood biomarkers in multi-test algorithms. Vet Immunol Immunopathol 2022; 248:110419. [DOI: 10.1016/j.vetimm.2022.110419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 03/24/2022] [Accepted: 04/06/2022] [Indexed: 10/18/2022]
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25
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Ortega J, Infantes-Lorenzo J, Roy A, de Juan L, Romero B, Moreno I, Domínguez M, Domínguez L, Bezos J. Factors affecting the performance of P22 ELISA for the diagnosis of caprine tuberculosis in milk samples. Res Vet Sci 2022; 145:40-45. [DOI: 10.1016/j.rvsc.2022.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 02/01/2022] [Accepted: 02/02/2022] [Indexed: 10/19/2022]
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26
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Ortega J, Roy A, Díaz-Castillo A, de Juan L, Romero B, Sáez-Llorente JL, Domínguez L, Regal P, Infantes-Lorenzo JA, Álvarez J, Bezos J. Effect of the topical administration of corticosteroids and tuberculin pre-sensitisation on the diagnosis of tuberculosis in goats. BMC Vet Res 2022; 18:58. [PMID: 35086534 PMCID: PMC8793155 DOI: 10.1186/s12917-022-03156-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/17/2022] [Indexed: 12/05/2022] Open
Abstract
Background Caprine tuberculosis (TB) is a zoonosis caused by members of the Mycobacterium tuberculosis complex (MTBC). Caprine TB control and eradication programmes have traditionally been based on intradermal tuberculin tests and slaughterhouse surveillance. However, this strategy has limitations in terms of sensitivity and specificity. Different factors may affect the performance of the TB diagnostic tests used in goats and, subsequently, the detection of TB-infected animals. In the present study, the effect of two of the factors that may affect the performance of the techniques used to diagnose TB in goats, the topical administration of corticosteroids and a recent pre-sensitisation with tuberculin, was analysed. Methods The animals (n = 151) were distributed into three groups: (1) a group topically treated with corticosteroids 48 h after intradermal tuberculin tests (n = 53); (2) a group pre-sensitised with bovine and avian purified protein derivatives (PPDs) 3 days before the intradermal tuberculin test used for TB diagnosis (n = 48); and (3) a control group (n = 50). All the animals were tested using single and comparative intradermal tuberculin (SIT and CIT, respectively) tests, an interferon-gamma release assay (IGRA) and a P22 ELISA. Results The number of SIT test reactors was significantly lower in the group treated with corticosteroids when compared to the pre-sensitised (p < 0.001) and control (p = 0.036) groups. In contrast, pre-sensitisation with bovine and avian PPDs did not cause a significant reduction in the number of SIT and CIT test reactors compared with the control group. In fact, a higher number of reactors was observed after the prior tuberculin injection in the pre-sensitised group (p > 0.05). No significant effect was observed on IGRA and P22 ELISA due to corticosteroids administration. Nevertheless, a previous PPD injection affected the IGRA performance in some groups. Conclusions The application of topical corticosteroid 24 h before reading the SIT and CIT tests can reduce the increase in skin fold thickness and subsequently significantly decrease the number of positive reactors. Corticosteroids used can be detected in hair samples. A previous pre-sensitisation with bovine and avian PPDs does not lead to a significant reduction in the number of intradermal tests reactors. These results are valuable in order to improve diagnosis of caprine TB and detect fraudulent activities in the context of eradication programs.
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Affiliation(s)
- J Ortega
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain.,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - A Roy
- Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - A Díaz-Castillo
- Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - L de Juan
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain.,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - B Romero
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain.,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | | | - L Domínguez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain.,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - P Regal
- Laboratorio de Higiene, Inspección y Control de Alimentos (LHICA), Departamento de Química Analítica, Nutrición y Bromatología, Facultad de Veterinaria, Universidade de Santiago de Compostela, Lugo, Spain
| | - J A Infantes-Lorenzo
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Majadahonda, Madrid, Spain
| | - J Álvarez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain.,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain
| | - J Bezos
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain. .,Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, Madrid, Spain.
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27
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Ortega J, Infantes-Lorenzo JA, Bezos J, Roy Á, de Juan L, Romero B, Moreno I, Gómez-Buendía A, Agulló-Ros I, Domínguez L, Domínguez M. Evaluation of P22 ELISA for the Detection of Mycobacterium bovis-Specific Antibody in the Oral Fluid of Goats. Front Vet Sci 2021; 8:674636. [PMID: 34458351 PMCID: PMC8385241 DOI: 10.3389/fvets.2021.674636] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 07/20/2021] [Indexed: 11/13/2022] Open
Abstract
The ante-mortem diagnosis of tuberculosis (TB) in ruminants is based mainly on the intradermal tuberculin test and the IFN-γ assay. Antibody (Ab)-based tests have emerged as potential tools for the detection of TB infected animals using serum, plasma, or even milk samples. Oral fluids have also been evaluated as alternative samples with which to detect specific Abs against Mycobacterium bovis in pigs or wild boars, but not in ruminants. The objective of this study was, therefore, to evaluate the performance of an in house-ELISA for TB diagnosis (P22 ELISA) in goats as an experimental model for the diagnosis of TB using oral fluid samples. Oral fluid samples from 64 goats from a TB-infected herd (n = 197) and all the animals from a TB-free herd (n = 113) were analyzed using the P22 ELISA. The estimated sensitivity (Se) and specificity (Sp) were 34.4% (95% CI: 22.4–45.6) and 100% (95% CI: 97.4–100), respectively. The optimal cut-off point was set at 100% according to the ROC analysis. Those animals with a higher level of Abs in their oral fluid attained a higher lesion score (p = 0.018). In fact, when taking into account only the setting of the animals with severe lesions (n = 16), the ELISA showed a Se of 75% (95% CI: 53.7–96.2). Results of the present study suggest that the P22 ELISA is highly specific but has a limited value detecting infected animals in oral fluid samples. Nevertheless, its performance is significantly higher in the presence of severe lesions.
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Affiliation(s)
- Javier Ortega
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - José A Infantes-Lorenzo
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Álvaro Roy
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Lucia de Juan
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Beatriz Romero
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| | | | - Irene Agulló-Ros
- Grupo de Investigación en Sanidad Animal y Zoonosis, Departamento de Anatomía y Anatomía Patológica Comparadas, Facultad de Veterinaria, Universidad de Córdoba, Córdoba, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
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28
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Didkowska A, Krajewska-Wędzina M, Klich D, Prolejko K, Orłowska B, Anusz K. The Risk of False-Positive Serological Results for Paratuberculosis in Mycobacterium bovis-Infected Cattle. Pathogens 2021; 10:pathogens10081054. [PMID: 34451518 PMCID: PMC8399313 DOI: 10.3390/pathogens10081054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/11/2021] [Accepted: 08/18/2021] [Indexed: 11/19/2022] Open
Abstract
Both bovine tuberculosis (BTB) and paratuberculosis (paraTB) continue to cause significant economic losses in cattle breeding; in addition, their etiological agents have zoonotic potential. Although the diagnostics of both diseases are still being improved, problems still remain, such as the potential for cross-reactivity to the antigens used in tests. The aim of the present study was to confirm whether animals known to harbor Mycobacterium bovis antibodies are at increased risk of yielding positive results in paraTB serotesting and, additionally, to verify the accuracy of three commonly used methods for confirming M. bovis infection: ELISA, the tuberculin skin test (TST), and the presence of gross lesions. Material was collected from 98 dairy cattle suspected of BTB due to TST-positive results. During postmortem examination, gross lesions were assessed visually. Blood, lymph nodes, and TB-suspected organs were collected. Serum was obtained from the collected blood and tested serologically for TB and paraTB. The tissues underwent standard microbiological testing for M. tuberculosis complex. Among the 98 TST-positive individuals, tuberculous gross lesions were detected in 57 (58.1%), MTBC were isolated in 83 (84.7%), and the ELISA test was positive for 21 (21.4%). None of the lesions characteristic for paraTB were detected. The chance of obtaining a positive TB result by ELISA was seven times higher using the ELISA-paraTB method; hence, there is a significant risk of obtaining false-positive serological results for paraTB in M. bovis-infected cattle. However, the hypothesis that infection of M. bovis or prior TST performance may have boosted the host immune response and therefore increased the sensitivity of the paraTB-ELISA cannot be excluded.
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Affiliation(s)
- Anna Didkowska
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland; (K.P.); (B.O.); (K.A.)
- Correspondence:
| | | | - Daniel Klich
- Department of Animal Genetics and Conservation, Institute of Animal Sciences, Warsaw University of Life Sciences (SGGW), 02-786 Warsaw, Poland;
| | - Kinga Prolejko
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland; (K.P.); (B.O.); (K.A.)
| | - Blanka Orłowska
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland; (K.P.); (B.O.); (K.A.)
| | - Krzysztof Anusz
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), 02-776 Warsaw, Poland; (K.P.); (B.O.); (K.A.)
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29
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El-Sayyad GS, Hasan OF, Saad MAM, El-Batal AI. Improving the diagnosis of bovine tuberculosis using gold nanoparticles conjugated with purified protein derivative: special regard to staphylococcal protein A and streptococcal protein G. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:29200-29220. [PMID: 33550524 DOI: 10.1007/s11356-021-12549-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
Different ancillary immunodiagnostic tests were traditionally-established for diagnosis of bovine tuberculosis (BTB) either cellular or humoral as tuberculin skin test (TST), gamma interferon (INF-γ), and indirect enzyme-linked immunosorbent assay (iELISA). These tests had been consumed more time and expensive, and needed sophisticated equipment. To dissolve these problems, serological diagnosis depending on humoral immunity is the aim of this work. Herein, slide-based agglutination test was chosen as a rapid and simple field test based on purified protein derivative (PPD) antigen in addition to some supplementation materials such as Staphylococcal protein A (SPA) and Streptococcal protein G (SPG) to improve detection of BTB antibody in serum samples. Gold nanoparticles (Au NPs) were synthesized by gamma ray, and after complete characterization, the synthesized Au NPs were spherical, small-sized, and stable without any impurities. Addition of such supplementation reagents for serodiagnosis of tuberculosis is of paramount important for the detection of serum antibodies against tuberculosis (TB) and it was considered an easily simple and possible way for improving TB diagnosis. In this work, 70 animals tested positive for TST as well as 20 animals tested negative for TST were used for the diagnosis of BTB depending on humoral immune response based on PPD slide agglutination test using reporter regents (SPA and/or SPG) either native or recombinant. The agglutination density was recorded and read in 4 degrees of positivity with scores ranging from negative (-) to very strong reaction (++++) occurred in different times of agglutination. Groups showed 100% positive reactivates employed in Exp. 1, 2, and 3 with differentiation of slide agglutination test density and was rated from moderate positivity (2+) to very strong (4+), with predominant positivity in density of (3+). Pink-colored intensity is associated with the strengthened reactions between PPD-conjugated Au NPs and serum antibody of each tested samples, which allows for visual rapid, simple, and effective attractive diagnosis of BTB. The specificity and sensitivity of the serological tests were characterized. TST offers the highest sensitivity (83.6%) among the other immunoassays, while the lowest specificity was recorded in TST (57.4%). SPA/SPG offers the best performance in term of combined sensitivity and specificity (performance index) of 175.4. Therefore, the development and uses of detection reagent (such as SPA and/or SPG) slide co-agglutination test (COAT), either native or recombinant (rSPA/SPG) for the detection of TB antibodies based on PPD antigen, as well as the uses of Au NPs rSPA/SPG as detection conjugate based on the same antigen, were also performed as a simple, rapid, sensitive, specific, eco-friendly, and low cost, which shows a great potential in field and lab diagnosis of BTB. So, high reduction in reagents that yields reactions similarly as traditional techniques was needed.
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Affiliation(s)
- Gharieb S El-Sayyad
- Drug Microbiology Lab., Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
| | - Omnia F Hasan
- Animal Health Research Institute, Bacteriology Department, TB Unit, Dokki, Giza, Egypt
| | | | - Ahmed I El-Batal
- Drug Microbiology Lab., Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
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30
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Bridges N, van Winden S. The Occurrence of Mycobacterium avium Subspecies paratuberculosis Positive Milk Antibody ELISA Results in Dairy Cattle under Varying Time Periods after Skin Testing for Bovine Tuberculosis. Animals (Basel) 2021; 11:ani11051224. [PMID: 33922705 PMCID: PMC8145865 DOI: 10.3390/ani11051224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/12/2021] [Accepted: 04/20/2021] [Indexed: 12/18/2022] Open
Abstract
Enzyme-linked immunosorbent assays (ELISA) are used to screen cows for Mycobacterium avium subspecies paratuberculosis (MAP) infections, informing Johne's disease (JD) management practices in dairy herds. The causative agent of bovine tuberculosis (bTB), Mycobacterium bovis, and MAP share multiple antigens. Moreover, Mycobacterium avium subspecies avium is used in the single intradermal cervical comparative tests (SICCT) that are routinely used in early detection of cows infected with bTB. Although these are different types of immune responses, potentially the SICCT may interfere with the levels of MAP antibodies. This study aimed to clarify the relationship between the SICCT-MAP milk ELISA testing interval and apparent prevalence of JD risk statuses. Data from 51 herds were used, totalling 46,738 cow observations. The Poisson models showed that MAP milk ELISA testing at 14 day intervals post-SICCT statistically significantly increased the odds of detecting JD-positive cows compared to JD testing 85+ days post-SICCT. The odds ratio (OR) started at 2.5 in the first 14 day interval post-SICCT, increasing each two-week period to an OR of 4.0 at 57-70 days, to subsequently drop. Additionally, a herd history of bTB increased the odds of detecting JD-positive cows (OR = 1.2); this was relatively limited compared to the magnitude of the post-SICCT effect.
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McCallan L, Brooks C, Barry C, Couzens C, Young FJ, McNair J, Byrne AW. Serological test performance for bovine tuberculosis in cattle from herds with evidence of on-going infection in Northern Ireland. PLoS One 2021; 16:e0245655. [PMID: 33848298 PMCID: PMC8043403 DOI: 10.1371/journal.pone.0245655] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 01/05/2021] [Indexed: 02/03/2023] Open
Abstract
The ability to accurately identify infected hosts is the cornerstone of effective disease control and eradication programs. In the case of bovine tuberculosis, accurately identifying infected individual animals has been challenging as all available tests exhibit limited discriminatory ability. Here we assess the utility of two serological tests (IDEXX Mycobacterium bovis Ab test and Enfer multiplex antibody assay) and assess their performance relative to skin test (Single Intradermal Comparative Cervical Tuberculin; SICCT), gamma-interferon (IFNγ) and post-mortem results in a Northern Ireland setting. Furthermore, we describe a case-study where one test was used in conjunction with statutory testing. Serological tests using samples taken prior to SICCT disclosed low proportions of animals as test positive (mean 3% positive), despite the cohort having high proportions with positive SICCT test under standard interpretation (121/921; 13%) or IFNγ (365/922; 40%) results. Furthermore, for animals with a post-mortem record (n = 286), there was a high proportion with TB visible lesions (27%) or with laboratory confirmed infection (25%). As a result, apparent sensitivities within this cohort was very low (≤15%), however the tests succeeded in achieving very high specificities (96-100%). During the case-study, 7/670 (1.04%) samples from SICCT negative animals from a large chronically infected herd were serology positive, with a further 17 animals being borderline positive (17/670; 2.54%). Nine of the borderline animals were voluntarily removed, none of which were found to be infected post-mortem (no lesions/bacteriology negative). One serology test negative animal was subsequently found to have lesions at slaughter with M. bovis confirmed in the laboratory.
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Affiliation(s)
- Lyanne McCallan
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Cathy Brooks
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Claire Barry
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Catherine Couzens
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Fiona J. Young
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Jim McNair
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
| | - Andrew W. Byrne
- Veterinary Sciences Division, Agri-Food and Biosciences Institute, Stormont, Belfast, Northern Ireland
- School of Biological Sciences, Queen’s University Belfast, Belfast, Northern Ireland
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32
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Carneiro PAM, de Moura Sousa E, Viana RB, Monteiro BM, do Socorro Lima Kzam A, de Souza DC, Coelho AS, Filho JDR, Jordao RS, Tavares MRM, Kaneene JB. Study on supplemental test to improve the detection of bovine tuberculosis in individual animals and herds. BMC Vet Res 2021; 17:137. [PMID: 33789652 PMCID: PMC8011399 DOI: 10.1186/s12917-021-02839-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 03/16/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Bovine tuberculosis (bTB), is a worldwide disease caused by Mycobacterium bovis (M. bovis). The success of bTB eradication and control programs is based on early detection and the removal of reactors from a herd thus routine testing and cull strategy have been applied globally. Since the late nineteenth century, the Tuberculin Skin Test (TST) has been the primary antemortem test available to support bTB eradication campaigns. Due to the TST limitations in terms of Se and Sp, the credibility of the diagnosis is frequently questioned given the occurrence of false-positive and false-negative reactions, therefore, it is necessary to confirm reactive animals using other methods, ensuring the reliability of the diagnosis. The aim of this study was to evaluate the sensitivity and specificity of a multiplex enzyme-linked immunosorbent assay (ELISA) relative to the tuberculin test used for the diagnosis of tuberculosis in cattle in Brazil. RESULTS Lack of agreement between comparative cervical tuberculin test and ELISA IDEXX TM was observed. The 2 animals positive on the comparative cervical tuberculin test did not react at the ELISA IDEXX TM and 22 negative reactors by comparative cervical tuberculin test were positive by the ELISA IDEXX TM. The ELISA IDEXX TM showed sensitivity that is significantly lower than the official screening test the single cervical tuberculin. ELISA IDEXX TM also detected infected animals and herds undetected by the comparative cervical tuberculin test. The parallel use of comparative cervical tuberculin test and ELISA IDEXX TM increased sensitivity and the feasibility bTB screening. CONCLUSIONS The results obtained here suggest that the ELISA IDEXX TM may be a supplemental test for the detection of Mycobacterium bovis infection in regions without routine testing and slaughter, where the disease generally progresses to more advanced stages and antibody responses are likely to be more prevalent. Evidence to support the validation of the ELISA IDEXX™ as a supplemental test for bTB eradication programs was provided.
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Affiliation(s)
- Paulo Alex Machado Carneiro
- Amazonas State Federal Institute of Science and Technology, Manaus East Zone Campus (IFAM/ CMZL), Manaus, Brazil.,Center for Comparative Epidemiology, College of Veterinary Medicine, Michigan State University, East Lansing, USA
| | | | - Rinaldo Batista Viana
- Graduate Program in Animal Reproduction, Institute of Health and Animal Production, Federal Rural University of the Amazon, Belem, Brazil
| | - Bruno Moura Monteiro
- Graduate Program in Animal Reproduction, Institute of Health and Animal Production, Federal Rural University of the Amazon, Belem, Brazil
| | | | - Damazio Campos de Souza
- Research Group on Andrology, Artificial Insemination, Health and Genetic Improvement of Cattle and Buffaloes, Amazon, Brazil
| | - Anderson Silva Coelho
- Graduate Program in Animal Reproduction, Institute of Health and Animal Production, Federal Rural University of the Amazon, Belem, Brazil
| | | | | | | | - John B Kaneene
- Center for Comparative Epidemiology, College of Veterinary Medicine, Michigan State University, East Lansing, USA.
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Alonso N, Griffa N, Moyano RD, Mon ML, Colombatti Olivieri MA, Barandiaran S, Vivot MM, Fiorini G, Canal AM, Santangelo MP, Singh M, Romano MI. Development of a lateral flow immunochromatography test for the rapid detection of bovine tuberculosis. J Immunol Methods 2020; 491:112941. [PMID: 33321133 DOI: 10.1016/j.jim.2020.112941] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 12/05/2020] [Accepted: 12/08/2020] [Indexed: 12/20/2022]
Abstract
Detection of specific antibodies would be a useful test strategy for bovine tuberculosis (bTB) as a complement to the single skin test. We developed a lateral flow immunochromatography (LFIC) test for rapid bTB detection based on the use of a conjugate of gold nanoparticles with a recombinant G protein. After evaluating 3 Mycobacterium bovis (MB) antigens: ESAT-6, CFP-10 and MPB83 for the control line, we selected MPB83 given it was the most specific. The performance of the test was analyzed with 820 bovine sera, 40 sera corresponding to healthy animals, 5 sera from animals infected with Mycobacterium avium subsp. paratuberculosis (MAP) and 775 sera of animals from herds with bTB. All these sera were also submitted to a validated bTB-ELISA using whole-cell antigen from MB. From the 775 sera of animals from herds with bTB, 87 sera were positive by the bTB-ELISA, 45 were positive by LFIC and only 5 animals were positives by skin test (TST). To confirm bTB infection in the group of TST (-), bTB-ELISA (+) and LFIC (+) animals, we performed postmortem examination in 15 randomly selected animals. Macroscopically, these 15 animals had numerous small and large yellow-white granulomas, characteristic of bTB, and the infection was subsequently confirmed by PCR in these tissues with lesions (gold standard). No false positive test result was detected with the developed LFIC either with the sera from healthy animals or from animals infected with MAP demonstrating that it can be a useful technique for the rapid identification of animals infected with bTB.
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Affiliation(s)
- Natalia Alonso
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina
| | - Natanael Griffa
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina
| | - Roberto D Moyano
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina.
| | - Maria L Mon
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina
| | | | - Soledad Barandiaran
- Facultad de Veterinaria, Universidad de Buenos Aires, Buenos Aires, Argentina
| | | | | | - Ana M Canal
- Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Argentina
| | - María P Santangelo
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina
| | - Mahavir Singh
- LIONEX Diagnostics & Therapeutics GmbH, Braunschweig 38126, Germany
| | - María I Romano
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO), CONICET-INTA, Buenos Aires, Argentina
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Cho YS, Lee SE, Jang Y, Jung S, Kim JM. Identification of B cell antigenome in Mycobacterium bovis by immunoproteomic analysis. Acta Vet Hung 2020; 68:123-129. [PMID: 33055304 DOI: 10.1556/004.2020.00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 02/28/2020] [Indexed: 11/19/2022]
Abstract
Bovine tuberculosis (bTB) is a common zoonosis prevalent in many countries with grave economic consequences. Most developed and developing countries have implemented the test-and-slaughter policy to protect public health and reduce economic losses in the cattle industry. The official diagnosis of bTB is based on assays dependent on cell-mediated immunity (CMI). CMI-based diagnosis demonstrates diagnostic incapability at late stages of infection, which could be overcome by diagnosis based on humoral immunity (HI). Therefore, there is an urgent need to identify and define the B cell antigenome of Mycobacterium bovis. In this study, the B cell antigenome of culture filtrate proteins (CFP) was defined by mass spectrometry-based proteomics technology. Four spots were detected on 2-dimensional gel electrophoresis (2-DE) against M. bovis-positive serum in an immunoblotting experiment. Twenty-one proteins were identified in four spots by proteomic tools, such as Mb2900, Mb2898, Mb0448, Mb3834c, Mb1918c, Mb0134c, Mb0358 and Mb1868c, which are known B cell antigens, including 13 new proteins, i.e. Mb3751, Mb2006c, Mb3276c, Mb2244, Mb1164c, Mb2553c, Mb2946c, Mb1849c, Mb1511c, Mb1034c, Mb2616c, Mb0854c and Mb2267. These new proteins identified by 2-DE and immunoblotting were the B cell antigens used in developing serological diagnostic methods based on HI to bTB.
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Affiliation(s)
- Yun Sang Cho
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Republic of Korea
| | - Sang Eun Lee
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Republic of Korea
| | - Youngboo Jang
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Republic of Korea
| | - Sukchan Jung
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Republic of Korea
| | - Jong Man Kim
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Republic of Korea
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35
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Barden M, Smith RF, Higgins HM. The interpretation of serial Johne's disease milk antibody results is affected by test characteristics, pattern of test results and parallel bovine tuberculosis testing. Prev Vet Med 2020; 183:105134. [PMID: 32912605 DOI: 10.1016/j.prevetmed.2020.105134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 08/11/2020] [Accepted: 08/27/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND In the UK, quarterly Johne's disease milk antibody ELISAs (JD-mELISAs) are commonly used to classify animals which are likely to be infectious, termed "red cows". "Red cows" are classified following two positive results from the previous four tests (e.g. + - - +). All cattle are also regularly screened for bovine tuberculosis using intradermal avian and bovine tuberculin, and it is advised to maintain a 60 day interval between a tuberculosis test and JD-mELISA. AIMS To evaluate the impact of bovine tuberculosis testing on JD-mELISAs, and to quantify the impact of test specificity and "red cow" classification test pattern on the probability of infection. METHODS Four years of individual cow milk records with JD-mELISA results were collated from 735 dairy farms and matched to tuberculosis testing records. A two-level multivariable logistic regression model quantified the effect of tuberculosis testing on JD-mELISA result. The specificity and age-dependent sensitivity of a single JD-mELISA were estimated and used to calculate likelihood ratios following each test. Using Bayes' theorem, the posterior probability of infection with Johne's disease was calculated for different specificities, ages of cow, and patterns of test results. RESULTS There were increased odds of a positive JD-mELISA if it was ≤30 days (OR: 2.1) or 31-60 days (OR: 1.2) after a tuberculosis test, compared to >90 days. A larger avian skin reaction at the tuberculosis test was also associated with increased odds of a positive JD-mELISA. The proportion of cows which tested exclusively negative after their first positive JD-mELISA was higher if that JD-mELISA was ≤30 days after a tuberculosis test compared to >90 days. The posterior probability of infection reduced substantially when the test specificity was slightly reduced. In "red cows" classified following two consecutive positive tests, if the test specificity was reduced to 0.95, then the posterior probability of infection was only >95 % if the prior probability was >13 %. If the "red cow" classification was due to two non-consecutive positive tests (+ - - +), the posterior probability of infection was only >95 % if the prior probability was >43 %. CONCLUSIONS Testing for Johne's disease within 60 days of a tuberculosis test is associated with a higher chance of a positive JD-mELISA and this may reflect a reduction in the ELISA specificity. Relatively small reductions in JD-mELISA specificity can markedly reduce the posterior probability of infection which also depends on the pattern of test results which classifies "red cows".
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Affiliation(s)
- M Barden
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom.
| | - R F Smith
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom
| | - H M Higgins
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom
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36
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Picasso-Risso C, Alvarez J, VanderWaal K, Kinsley A, Gil A, Wells SJ, Perez A. Modelling the effect of test-and-slaughter strategies to control bovine tuberculosis in endemic high prevalence herds. Transbound Emerg Dis 2020; 68:1205-1215. [PMID: 32767833 DOI: 10.1111/tbed.13774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 12/14/2022]
Abstract
Bovine tuberculosis (bTB) prevalence substantially increased over the past two decades with relatively high impact on large dairy herds, raising the concern of regulatory authorities and industry stakeholders, and threatening animal and public health. Lack of resources, together with the economic and social consequences of whole-herd stamping-out, makes depopulation an impractical disease control alternative in these herds. The increase in bTB prevalence was associated with demographic and management changes in the dairy industry in Uruguay, reducing the efficacy of the current control programme (i.e. status quo) based on intradermal serial testing with caudal fold- and comparative-cervical tuberculin test-and-slaughter of reactors (CFT-CCT). Here, we aimed to assess the epidemiological effectiveness of six alternative control scenarios based on test-and-slaughter of positive animals, using mathematical modelling to infer bTB-within-herd dynamics. We simulated six alternative control strategies consisting of testing adult cattle (>1 year) in the herd every 3 months using one test (in vivo or in vitro) or a combination in parallel of two tests (CFT, interferon-gamma release assay-IGRA- or enzyme-linked immunosorbent assay). Results showed no significant differences overall in the time needed to reach bTB eradication (median ranging between 61 and 82 months) or official bovine tuberculosis-free status (two consecutive negative herd tests) between any of the alternative strategies and the status quo (median ranging between 50 and 59 months). However, we demonstrate how alternative strategies can significantly reduce bTB prevalence when applied for restricted periods (6, 12 or 24 months), and in the case of IGRAc (IGRA using peptide-cocktail antigens), without incurring on higher unnecessary slaughter of animals (false positives) than the status quo in the first 6 months of the programme (p-value < .05). Enhanced understanding bTB-within-herd dynamics with the application of different control strategies help to identify optimal strategies to ultimately improve bTB control and bTB eradication from dairies in Uruguay and similar endemic settings.
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Affiliation(s)
- Catalina Picasso-Risso
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA.,Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay
| | - Julio Alvarez
- VISAVET Health Surveillance Centre, Universidad Complutense, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Kimberly VanderWaal
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA
| | - Amy Kinsley
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA
| | - Andres Gil
- Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay
| | - Scott J Wells
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA
| | - Andres Perez
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA
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Villafañe L, Forrellad MA, López MG, Garbaccio S, Garro C, Rocha RV, Eirin ME, Singh M, Taboga OA, Bigi F. Production of Mycobacterium bovis Antigens Included in Recombinant Occlusion Bodies of Baculovirus. J Mol Microbiol Biotechnol 2020; 29:83-90. [PMID: 32259815 DOI: 10.1159/000506687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 02/18/2020] [Indexed: 11/19/2022] Open
Abstract
Bovine tuberculosis (bTB) is a disease produced by Mycobacterium bovis that affects livestock, wild animals, and humans. The classical diagnostic method to detect bTB is measuring the response induced with the intradermal injection of purified protein derivative of M. bovis (PPDb). Another ancillary bTB test detects IFN-γ produced in whole blood upon stimulation with PPDb, protein/peptide cocktails, or individual antigens. Among the most used M. bovis antigens in IFN-γ assays are the secreted proteins ESAT-6 and CFP-10, which together with antigen Rv3615c improve the sensitivity of the test in comparison to PPDb. Protein reagents for immune stimulation are generally obtained from Escherichia coli, because this bacterium produces a high level of recombinant proteins. However, E. coli recombinant antigens are in general contaminated with lipopolysaccharides and other components that produce non-specific IFN-γ secretion in in vitro assays. In this work, we produced the relevant ESAT-6, CFP-10, and Rv3615c M. bovis antigens as fusions to the polyhedrin protein from the baculovirus AcMNPV. We obtained chimeric proteins effectively incorporated to the occlusion bodies and easily purified the recombinant polyhedra with no reactive contaminants. In an IFN-γ assay, these fusion proteins showed equivalent sensibility but better specificity than the same M. bovis proteins produced in E. coli.
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Affiliation(s)
- Luciana Villafañe
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | - Marina Andrea Forrellad
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | - María Gabriela López
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | - Sergio Garbaccio
- Institute of Pathobiology, National Institute of Agricultural Technology (INTA, Instituto de Patobiología, Instituto Nacional de Tecnología Agropecuaria), Buenos Aires, Argentina
| | - Carlos Garro
- Institute of Pathobiology, National Institute of Agricultural Technology (INTA, Instituto de Patobiología, Instituto Nacional de Tecnología Agropecuaria), Buenos Aires, Argentina
| | - Rosana Valeria Rocha
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | - María Emilia Eirin
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | | | - Oscar A Taboga
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina
| | - Fabiana Bigi
- Institute of Biotechnology, National Institute of Agricultural Technology (INTA, Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria) and IABIMO-National Scientific and Technical Research Council (CONICET, Consejo Nacional de Investigaciones Científicas y Tecnológicas), Buenos Aires, Argentina,
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38
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Lyashchenko KP, Vordermeier HM, Waters WR. Memory B cells and tuberculosis. Vet Immunol Immunopathol 2020; 221:110016. [PMID: 32050091 DOI: 10.1016/j.vetimm.2020.110016] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/30/2019] [Accepted: 01/29/2020] [Indexed: 02/09/2023]
Abstract
Immunological memory is a central feature of adaptive immunity. Memory B cells are generated upon stimulation with antigen presented by follicular dendritic cells in the peripheral lymphoid tissues. This process typically involves class-switch recombination and somatic hypermutation and it can be dependent or independent on germinal centers or T cell help. The mature B cell memory pool is generally characterized by remarkable heterogeneity of functionally and phenotypically distinct sub-populations supporting multi-layer immune plasticity. Memory B cells found in human patients infected with Mycobacterium tuberculosis include IgD+ CD27+ and IgM+ CD27+ subsets. In addition, expansion of atypical memory B cells characterized by the lack of CD27 expression and by inability to respond to antigen-induced re-activation is documented in human tuberculosis. These functionally impaired memory B cells are believed to have adverse effects on host immunity. Human and animal studies demonstrate recruitment of antigen-activated B cells to the infection sites and their presence in lung granulomas where proliferating B cells are organized into discrete clusters resembling germinal centers of secondary lymphoid organs. Cattle studies show development of IgM+, IgG+, and IgA+ memory B cells in M. bovis infection with the ability to rapidly differentiate into antibody-producing plasma cells upon antigen re-exposure. This review discusses recent advances in research on generation, re-activation, heterogeneity, and immunobiological functions of memory B cells in tuberculosis. The role of memory B cells in post-skin test recall antibody responses in bovine tuberculosis and implications for development of improved immunodiagnostics are also reviewed.
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Affiliation(s)
| | - H Martin Vordermeier
- Tuberculosis Research Group, Animal and Plant Health Agency, Addlestone, United Kingdom; Institute for Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, United Kingdom
| | - W Ray Waters
- National Animal Disease Center, Agricultural Research Service, US Department of Agriculture, Ames, IA, USA
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39
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Griffa N, Moyano RD, Canal AM, Travería GE, Santangelo MP, Alonso N, Romano MI. Development and diagnostic validation of an ELISA based on an antigenic mixture for the detection of bovine tuberculosis. Vet J 2020; 256:105426. [PMID: 32113584 DOI: 10.1016/j.tvjl.2020.105426] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 01/09/2020] [Accepted: 01/13/2020] [Indexed: 11/16/2022]
Abstract
Programs for the eradication of bovine tuberculosis (bTB) focus on the tuberculin skin test (TST) and slaughter of reactor cattle. However, the disease remains an animal health concern in several countries and improving the efficiency of the TST has become a critical issue. The detection of Mycobacterium bovis antibodies in serum, within weeks after the TST, may be a rapid and inexpensive way to improve bTB control. This study reports the validation of an enzyme-linked immunosorbent assay (ELISA) to detect bovine tuberculosis as an ancillary test to TST in dairy farms in Argentina. The estimated validation parameters were within the established requirements of the World Organization for Animal Health (OIE). The test demonstrated high repeatability, with coefficients of variation <25%. High test reproducibility through interlaboratory testing was also found, with an estimated Pearson coefficient of 0.9648 (95% confidence intervals 0.9315-0.9820). The ELISA detected tuberculous cattle unidentified by the TST. Of 43 animals sent to slaughterhouses that were ELISA positive 15-17 days after a negative TST, 36 were confirmed as infected with M. bovis by histopathology and IS6110 PCR. According to ROC curve analysis of results of 145 cattle from M. bovis-free herds and the 36 M. bovis-infected cattle, at a corrected optical density cut-off point of 0.3853, specificity was 95.95% and the positive predictive value at this cut-off was 83.72%. The ELISA detection test validated in this study could be readily applied in dairy farms, to complement a prior TST and improve livestock health.
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Affiliation(s)
- N Griffa
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina
| | - R D Moyano
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina
| | - A M Canal
- Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Argentina
| | - G E Travería
- Centro de Diagnóstico e Investigaciones Veterinarias (CEDIVE) de la Facultad de Ciencias Veterinarias - Universidad de la Plata, Argentina
| | - M P Santangelo
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina
| | - N Alonso
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina.
| | - M I Romano
- Instituto de Agrobiotecnología y Biología Molecular (IABiMo), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Nacional de Tecnología Agropecuaria (INTA), Argentina
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Soares Filho P, Ramalho A, Silva A, Issa M, Mota P, Silva C, Ribeiro A, Rei J, Leite R. Diagnostic performance of a commercial ELISA used as a complementary test for bovine tuberculosis in two bovine herds with different disease status. ARQ BRAS MED VET ZOO 2020. [DOI: 10.1590/1678-4162-11071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT Bovine tuberculosis is a worldwide spread zoonotic disease. Intradermal tuberculinizations are the most used diagnostic tests in the world. Serological tests can be an ancillary diagnosis for bovine tuberculosis. The objective of this study was to evaluate the diagnostic performance of the ELISA Mycobacterium Bovis Antibody Test Kit IDEXX ™ in infected herds, which were in different disease control stages. One hundred and twenty animals from two dairy herds of Minas Gerais state, Brazil, were subjected to the ELISA serological test and the comparative cervical tuberculin test (CCT). Diagnostic test parameters were estimated using Bayesian latent class models and concordance between tests estimated by the frequentist approach. The ELISA test presented lower sensitivity than CCT in both herds. Its sensitivity was higher in the herd in sanitation process. Specificity estimates were above 95% in both herds. Kappa index indicated low concordance or even disagreement between tests. According to the results, the ELISA IDEXX should not be used as substitution for CCT. The tests must not be associated in series. Parallel association increased diagnostic sensitivity in the herd which was in the process of sanitation.
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Affiliation(s)
| | - A.K. Ramalho
- Ministério da Agricultura, Pecuária e Abastecimento, Brazil
| | - A.M. Silva
- Ministério da Agricultura, Pecuária e Abastecimento, Brazil
| | - M.A. Issa
- Ministério da Agricultura, Pecuária e Abastecimento, Brazil
| | - P.M.P.C. Mota
- Ministério da Agricultura, Pecuária e Abastecimento, Brazil
| | | | | | - J.K.P. Rei
- Universidade Federal de Minas Gerais, Brazil
| | - R.C. Leite
- Universidade Federal de Minas Gerais, Brazil
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Weiblen C, Zanette RA, Ribeiro TC, Pereira Dos Santos CE, Ianiski LB, Pereira DIB, Santurio JM, Botton SDA. Intradermal injection of Pythium insidiosum protein antigens for improved diagnosis and treatment of pythiosis in an experimental model. Med Mycol 2019; 57:807-812. [PMID: 30260397 DOI: 10.1093/mmy/myy078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 08/08/2018] [Accepted: 08/27/2018] [Indexed: 11/14/2022] Open
Abstract
The oomycetous pathogen Pythium insidiosum is the causative agent of pythiosis, a life-threatening disease that affects animals and humans. This infectious disease is difficult to treat, and early and accurate diagnosis is critical for effective treatment. In this sense, this study aimed to evaluate the intradermal (ID) injection of P. insidiosum protein antigens (PiPA) for the diagnosis and treatment of pythiosis using an experimental model. For diagnostic purposes, PiPA were injected by the ID route in the following groups of rabbits: (a) control; (b) previously immunized with PiPA injected by the subcutaneous (SC) route; and (c) infected with P. insidiosum zoospores. For treatment purposes, rabbits with pythiosis were also treated with PiPA by the ID or SC routes. Mean induration sizes were different at 24 h and 72 h readings when compared to the control group. Sensitivity of the protocol was 100% at 24 h and 80% at 72 h, with 100% specificity in both readings. PiPA treatment using ID or SC routes did not result in significant differences in lesion sizes and cure rates; however, serum levels of interferon-gamma were higher in SC route. This study demonstrates the applicability of PiPA ID for diagnosis and treatment of pythiosis in an experimental model.
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Affiliation(s)
- Carla Weiblen
- Universidade Federal de Santa Maria (UFSM). aDepartamento de Medicina Veterinária Preventiva (DMVP)/ Programa de Pós Graduação em Medicina Veterinária (PPGMV)/ Centro de Ciências Rurais (CCR). bDepartamento de Microbiologia e Parasitologia (Demip)/Centro de Ciências da Saúde (CCS)
| | - Régis Adriel Zanette
- Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-Graduação em Ciências Biológicas: Farmacologia e Terapêutica
| | - Tatiana Corrêa Ribeiro
- Universidade Federal de Santa Maria (UFSM). aDepartamento de Medicina Veterinária Preventiva (DMVP)/ Programa de Pós Graduação em Medicina Veterinária (PPGMV)/ Centro de Ciências Rurais (CCR). bDepartamento de Microbiologia e Parasitologia (Demip)/Centro de Ciências da Saúde (CCS)
| | | | - Lara Baccarin Ianiski
- Universidade Federal de Santa Maria (UFSM). aDepartamento de Medicina Veterinária Preventiva (DMVP)/ Programa de Pós Graduação em Medicina Veterinária (PPGMV)/ Centro de Ciências Rurais (CCR). bDepartamento de Microbiologia e Parasitologia (Demip)/Centro de Ciências da Saúde (CCS)
| | | | - Janio Morais Santurio
- Universidade Federal de Santa Maria (UFSM). aDepartamento de Medicina Veterinária Preventiva (DMVP)/ Programa de Pós Graduação em Medicina Veterinária (PPGMV)/ Centro de Ciências Rurais (CCR). bDepartamento de Microbiologia e Parasitologia (Demip)/Centro de Ciências da Saúde (CCS)
| | - Sônia de Avila Botton
- Universidade Federal de Santa Maria (UFSM). aDepartamento de Medicina Veterinária Preventiva (DMVP)/ Programa de Pós Graduação em Medicina Veterinária (PPGMV)/ Centro de Ciências Rurais (CCR). bDepartamento de Microbiologia e Parasitologia (Demip)/Centro de Ciências da Saúde (CCS)
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Picasso-Risso C, Grau A, Bakker D, Nacar J, Mínguez O, Perez A, Alvarez J. Association between results of diagnostic tests for bovine tuberculosis and Johne's disease in cattle. Vet Rec 2019; 185:693. [PMID: 31554708 DOI: 10.1136/vr.105336] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 08/01/2019] [Accepted: 08/28/2019] [Indexed: 11/04/2022]
Abstract
BACKGROUND Bovine tuberculosis (bTB) diagnosis is impaired by numerous factors including cross-reactivity with Mycobacterium avium subspecies paratuberculosis, which causes Johne's disease (JD). In addition, the effect of repeated bTB-intradermal testing on the performance of JD diagnostic tests is not fully understood. This study aimed to evaluate the impact of repeated bTB-intradermal tests under field conditions in Spain on the JD serological status of cattle. METHODS bTB-positive herds (n=264) from Castilla-y-Leon region were selected and matched with officially tuberculosis-free control herds. The association between JD and bTB status at the herd level was assessed using conditional logistic regression and, in herds with both JD-positive and bTB-positive animals, a Bayesian hierarchical mixed-effect model was used for individual-level analysis. RESULTS A significantly higher risk of being JD positive (OR: 1.48; 95 per cent CI: 1.01 to 2.15) was found for bTB-positive herds compared with controls. Individual results indicated that cattle tested more than three times per year, within the last 90 days and more than 12 months were more likely to be JD positive. A skin test-related boost in antibody response could be the cause of an apparent increase of the sensitivity of the JD-absorbed ELISA. CONCLUSION The results demonstrate the interaction between bTB repeated testing and JD individual and herd-level results and this improved knowledge will facilitate the design of more effective control programmes in herds coinfected with two of the most important endemic diseases affecting cattle in Spain.
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Affiliation(s)
- Catalina Picasso-Risso
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, Minnesota, USA .,Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay
| | - Ana Grau
- Servicio de Sanidad Animal, Junta de Castilla y Leon, Valladolid, Castilla y León, Spain
| | | | - Jesus Nacar
- Servicio de Sanidad Animal, Junta de Castilla y Leon, Valladolid, Castilla y León, Spain
| | - Olga Mínguez
- Sanidad Animal, Junta de Castilla y Leon, Valladolid, Castilla y León, Spain
| | - Andres Perez
- Veterinary Population Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Julio Alvarez
- VISAVET Health Surveillance Centre, Universidad Complutense, Madrid, Spain.,Universidad Complutense de Madrid Facultad de Veterinaria, Madrid, Comunidad de Madrid, Spain
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Picasso-Risso C, Perez A, Gil A, Nunez A, Salaberry X, Suanes A, Alvarez J. Modeling the Accuracy of Two in-vitro Bovine Tuberculosis Tests Using a Bayesian Approach. Front Vet Sci 2019; 6:261. [PMID: 31457019 PMCID: PMC6701407 DOI: 10.3389/fvets.2019.00261] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 07/25/2019] [Indexed: 11/25/2022] Open
Abstract
Accuracy of new or alternative diagnostic tests is typically estimated in relation to a well-standardized reference test referred to as a gold standard. However, for bovine tuberculosis (bTB), a chronic disease of cattle, affecting animal and public health, no reliable gold standard is available. In this context, latent-class models implemented using a Bayesian approach can help to assess the accuracy of diagnostic tests incorporating previous knowledge on test performance and disease prevalence. In Uruguay, bTB-prevalence has increased in the past decades partially because of the limited accuracy of the diagnostic strategy in place, based on intradermal testing (caudal fold test, CFT, for screening and comparative cervical test, CCT, for confirmation) and slaughter of reactors. Here, we evaluated the performance of two alternative bTB-diagnostic tools, the interferon-gamma assay, IGRA, and the enzyme-linked immunosorbent assay (ELISA), which had never been used in Uruguay in the absence of a gold standard. In order to do so animals from two heavily infected dairy herds and tested with CFT-CCT were also analyzed with the IGRA using two antigens (study 1) and the ELISA (study 2). The accuracy of the IGRA and ELISA was assessed fitting two latent-class models: a two test-one population model (LCA-a) based on the analysis of CFT/CFT-CCT test results and one in-vitro test (IGRA/ELISA), and a one test-one population model (LCA-b) using the IGRA or ELISA information in which the prevalence was modeled using information from the skin tests. Posterior estimates for model LCA-a suggested that IGRA was as sensitive (75-78%) as the CFT and more sensitive than the serial use of CFT-CCT. Its specificity (90-96%) was superior to the one for the CFT and equivalent to the use of CFT-CCT. Estimates from LCA-b models consistently yielded lower posterior Se estimates for the IGRA but similar results for its Sp. Estimates for the Se (52% 95%PPI:44.41-71.28) and the Sp (92% 95%PPI:78.63-98.76) of the ELISA were however similar regardless of the model used. These results suggest that the incorporation of IGRA for detection of bTB in highly infected herds could be a useful tool to improve the sensitivity of the bTB-control in Uruguay.
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Affiliation(s)
- Catalina Picasso-Risso
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
- Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay
| | - Andres Perez
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Andres Gil
- Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay
| | - Alvaro Nunez
- División Laboratorios Veterinarios “Miguel C. Rubino”, Ministerio de Ganadería, Agricultura y Pesca, Montevideo, Uruguay
| | - Ximena Salaberry
- División Laboratorios Veterinarios “Miguel C. Rubino”, Ministerio de Ganadería, Agricultura y Pesca, Montevideo, Uruguay
| | - Alejandra Suanes
- División Laboratorios Veterinarios “Miguel C. Rubino”, Ministerio de Ganadería, Agricultura y Pesca, Montevideo, Uruguay
| | - Julio Alvarez
- VISAVET Health Surveillance Centre, Universidad Complutense, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
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Garbaccio SG, Garro CJ, Delgado F, Tejada GA, Eirin ME, Huertas PS, Leon EA, Zumárraga MJ. Enzyme-linked immunosorbent assay as complement of intradermal skin test for the detection of mycobacterium bovis infection in cattle. Tuberculosis (Edinb) 2019; 117:56-61. [PMID: 31378269 DOI: 10.1016/j.tube.2019.05.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 05/21/2019] [Accepted: 05/26/2019] [Indexed: 10/26/2022]
Abstract
Diagnostic tests based on cell-mediated immunity are used in programs for the control and eradication of bovine tuberculosis (bTB), which is mainly caused by Mycobacterium bovis. Additional serological assays could be performed as an ancillary method to detect an infected animal that fails to produce an immune response against the intradermal reaction (IDR), the official bTB test. In this study, we evaluated the effectiveness of an enzyme-linked immunosorbent assay (ELISA) that uses bovine PPD as a capture antigen as a complement to the IDR in herds with confirmed cases of bTB. The study was conducted in two stages. First, a panel of 200 serum samples was analyzed by ELISA. The sensitivity and specificity obtained were 60% and 99%, respectively. The subsequent stage consisted of evaluating 7,494 bovines from 14 selected dairy farms. The number of animals yielding a IDR negative/ELISA positive result were 200. A necropsy analysis of 33 of these IDR negative/ELISA positive animals revealed that 30 (91%) presented granulomatous lesions and positive M. bovis isolation. This finding confirmed bTB in most cases. Altogether, the results obtained in the present study suggest that the combined use of IDR and ELISA is an effective strategy to improve the control of bTB in endemic herds.
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Affiliation(s)
- S G Garbaccio
- Pathobiology Veterinary Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina.
| | - C J Garro
- Pathobiology Veterinary Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
| | - F Delgado
- Pathobiology Veterinary Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
| | - G A Tejada
- Colón Diagnosis Laboratory Services, Morón, 1708, Argentina
| | - M E Eirin
- Biotechnology Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
| | - P S Huertas
- Pathobiology Veterinary Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
| | - E A Leon
- Pathobiology Veterinary Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
| | - M J Zumárraga
- Biotechnology Institute, National Institute of Agricultural Technology (INTA), Hurlingham, 1686, Argentina
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Determination of the sensitivity and specificity of bovine tuberculosis screening tests in dairy herds in Thailand using a Bayesian approach. BMC Vet Res 2019; 15:149. [PMID: 31096976 PMCID: PMC6524330 DOI: 10.1186/s12917-019-1905-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 05/09/2019] [Indexed: 11/16/2022] Open
Abstract
Background The objective of this study was to determine the sensitivity (Se) and specificity (Sp) of bovine tuberculosis (bTB) screening tests including a single intradermal tuberculin (SIT) test, interferon gamma (IFN-γ) assay, and a commercial ELISA test (M. bovis Ab) in dairy cattle, under field conditions, using a Bayesian approach. Results The study population consisted of 128 dairy cows from 25 bTB-infected herds in Chiang Mai and Chiang Rai provinces, Thailand. A single-population Bayesian model was implemented assuming conditional dependence between the SIT test and IFN-γ assays. The 95% posterior probability interval (PPI) of the SIT test (severe interpretation) Se ranged from 75.3 to 95.2% (median = 87.6%), while the Sp was slightly lower (median = 83.6%, PPI = 74.2–92.8%). The IFN-γ assay Se was moderate and the 95% PPI ranged from 38.6 to 74.4% (median = 55.7%) with higher Sp (median = 93.5.4%, PPI = 87.0–98.1%). The M. bovis Ab ELISA Se was low, with 95% PPI ranging between 30.0 and 71.2% (median = 47.4%); however, the Sp was high (median = 90.9%, PPI = 84.5–95.5%). Conclusion The SIT test sensitivity was similar to that demonstrated in other regions and can, therefore, be used effectively as part of control programs in this area. The IFN-γ and M. bovis Ab ELISA assays can be applied as supplementary techniques. The test performance of these tests when used as single tests without confirmation, however, are expected to continue to challenge disease eradication efforts. Electronic supplementary material The online version of this article (10.1186/s12917-019-1905-x) contains supplementary material, which is available to authorized users.
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Evaluation of post-mortem diagnostic tests' sensitivity and specificity for bovine tuberculosis using Bayesian latent class analysis. Res Vet Sci 2019; 125:14-23. [PMID: 31108426 DOI: 10.1016/j.rvsc.2019.04.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 04/18/2019] [Accepted: 04/22/2019] [Indexed: 12/27/2022]
Abstract
This study aimed to evaluate the performance of real-time PCR (qPCR), ELISA IDEXX™, and bacterial isolation as post-mortem diagnostic tests in animals with lesions compatible with bovine tuberculosis detected by Brazilian Federal Inspection Service as part of the bovine tuberculosis active surveillance. Bayesian latent class models were used to estimate diagnostic tests' sensitivity, specificity, correlations, predictive values and frequency of infected animals. Samples of tuberculosis-suggestive lesions collected by FIS sanitary inspection routine in slaughterhouses from 11 Brazilian states were analyzed. Isolation was the most sensitive technique, 94.54% (95% Credible Interval (CrI) 90.09%-97.65%), qPCR was 64.69% (95% CrI 54.41%-74.15%) sensitive and ELISA IDEXX™ 26.74% (95% CrI 22.82%-30.97%). Tests' specificities were 98.19% (95% CrI 95.75%-99.45%), 93.49% (95% CrI 79.28%-99.66%), 95.53% (95% CrI 91.71%-98.02%) respectively. Despite its low sensitivity, ELISA IDEXX™ was able to identify positive samples that were not detected by the other techniques. These samples had high probability to be true positives given ELISA's positive predictive value. The correlations between qPCR and isolation were neither biologically nor statistically significant. The low sensitivity of the qPCR is a limiting factor to its use as a post-mortem diagnosis in bovine tuberculosis suggestive lesions. Its use could be recommended in situations of high prevalence, or in parallel association with other tests, such as ELISA IDEXX™. ELISA IDDEX™ should not be used as a unique test, or in substitution of the other tests, for the post-mortem diagnosis of bovine tuberculosis due to its sensitivity.
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Infantes-Lorenzo JA, Moreno I, Roy A, Risalde MA, Balseiro A, de Juan L, Romero B, Bezos J, Puentes E, Åkerstedt J, Tessema GT, Gortázar C, Domínguez L, Domínguez M. Specificity of serological test for detection of tuberculosis in cattle, goats, sheep and pigs under different epidemiological situations. BMC Vet Res 2019; 15:70. [PMID: 30823881 PMCID: PMC6397464 DOI: 10.1186/s12917-019-1814-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 02/20/2019] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Serum antibody detection has potential as a complementary diagnostic tool in animal tuberculosis (TB) control, particularly in multi-host systems. The objective of the present study was to assess the specificity (Sp) of an enzyme-linked immunosorbent assay (ELISA) based on the new multiprotein complex P22 for the detection of specific antibodies against the Mycobacterium tuberculosis complex (MTC) in the four most relevant domestic animals acting as MTC hosts: cattle, goat, sheep and pig. We used sera from an officially TB-free (OTF) country, Norway, and from a non-OTF one, Spain. The samples included sera from goats that had been vaccinated against M. avium subsp. paratuberculosis (MAP) and sheep from a herd in which Corynebacterium pseudotuberculosis had been isolated. RESULTS In cattle, the Sp ranged from 92.5 (IC95% 90.7-94) to 99.4% (IC95% 98.3-99.8) depending on the cut-off used and the origin of the samples (Spain or Norway). Sp in cattle (cut-off point 100) was significantly higher (P < 0.05) for Norwegian samples. By contrast, Sp in goats was consistently low at the 100 cut-off [30.9 (CI95%23.4-39.5)-78% (CI95% 68.9-85)]. A higher cut-off of 150 improved Sp in Norwegian goats [97% (CI95% 91.6-99)], but still yielded a poor Sp of 56.1% (CI95% 47.3-64.6) in Spanish goats. In Norway at the 100 cut-off the Sp was 58.3 (CI95% 42.2-72.9) and 90.6% (CI95% 81-95.6) in MAP vaccinated and non-vaccinated goats, respectively, indicating interference due to MAP vaccination. Sp in sheep was between 94.4 (CI95% 91.7-96.3) and 100% (CI95% 96.3-100) depending on the cut-off and country, and no diagnostic interference due to infection with C. pseudotuberculosis was recorded. Sp in pigs was 100%, regardless the cut-off point applied, and no significant differences were observed between pigs from Norway and from Spain. CONCLUSIONS Due to its excellent Sp in pigs and acceptable Sp in cattle and sheep, this ELISA may constitute a suitable option for TB screening at herd level, particularly in OTF-countries.
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Affiliation(s)
- J. A. Infantes-Lorenzo
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - I. Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - A. Roy
- CZ Veterinaria S.A., Porriño, Pontevedra, Spain
| | - M. A. Risalde
- SaBio (Health and Biotechnology), Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM), Ciudad Real, Spain
- Dpto. de Anatomía y Anatomía Patológica Comparadas, Agrifood Campus of International Excellence (ceia3), Universidad de Córdoba, Córdoba, Spain
| | - A. Balseiro
- SERIDA, Servicio Regional de Investigación y Desarrollo Agroalimentario, Centro de Biotecnología Animal, Deva-Gijón, Asturias Spain
| | - L. de Juan
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - B. Romero
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
| | - J. Bezos
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - E. Puentes
- CZ Veterinaria S.A., Porriño, Pontevedra, Spain
| | - J. Åkerstedt
- Norwegian Veterinary Institute, Sentrum, Oslo Norway
| | - G. T. Tessema
- Norwegian Veterinary Institute, Sentrum, Oslo Norway
| | - C. Gortázar
- SaBio (Health and Biotechnology), Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM), Ciudad Real, Spain
| | - L. Domínguez
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - M. Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
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Souza IIFD, Rodrigues RDA, Gonçalves Jorge KS, Silva MR, Lilenbaum W, Vidal CES, Etges RN, Kostovic M, Araújo FR. ELISA using a recombinant chimera of ESAT-6/MPB70/MPB83 for Mycobacterium bovis diagnosis in naturally infected cattle. J Vet Med Sci 2018; 81:9-14. [PMID: 30305467 PMCID: PMC6361649 DOI: 10.1292/jvms.18-0364] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Bovine tuberculosis (bTB) control programs generally rely on intradermal tuberculin tests for the antemortem diagnosis of Mycobacterium bovis infection in cattle, but these
tests detect only a portion of the infected animals. The aim of the present study was to evaluate the diagnostic coverage of a combination of the bTB antemortem techniques known as the
comparative intradermal tuberculin test (CITT) and an ELISA based on a recombinant chimera of ESAT-6/MPB70/MPB83 as the antigen in cattle. The results were compared to postmortem findings
based on M. bovis culturing and PCR. Paired comparisons of all data (n=92) demonstrated that ELISA and LST results compared to the culturing results did not present
significant differences (P=0.27 on McNemar’s test and P=0.12 on Fisher’s exact test, respectively). Using culturing as the gold standard, the sensitivity
and specificity of ELISA were 79.5% (95% CI: 64.5–89.2%) and 75.5% (95% CI: 62.4–85.1%), respectively, whereas LST demonstrated 100% sensitivity (95% CI: 91.03–100%) and 92.5% specificity
(95% CI: 82.1–97.0%). The ELISA results did not reveal significant differences in relation to the LST results (P>0.99 on Fisher’s exact test). Using the latter as the
gold standard, the sensitivity and specificity of ELISA were 79.1% (95% CI: 64.8–88.6%) and 79.6% (95% CI: 66.4–88.5%), respectively. The use of ELISA with the recombinant chimera of
ESAT-6/MPB70/MPB83 as the antigen complements the diagnostic coverage provided by CITT and increases the removal of infected animals from herds.
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Affiliation(s)
- Ingrid Ieda Fernando de Souza
- Postgraduate Program in Biotechnology and Biodiversity of the Central Western Region, Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | - Rudielle de Arruda Rodrigues
- Postgraduate Program in Veterinary Sciences, School of Veterinary Medicine (FAMEZ), Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | - Kláudia Santos Gonçalves Jorge
- Postgraduate Program in Veterinary Sciences, School of Veterinary Medicine (FAMEZ), Federal University of Mato Grosso do Sul, Campo Grande, MS 79070-900, Brazil
| | | | - Walter Lilenbaum
- Laboratory of Veterinary Bacteriology, Fluminense Federal University, Niterói, RJ 24. 210-130, Brazil
| | - Carlos Eugênio Soto Vidal
- Regional Technical Unit for Agriculture, Livestock and Supply of Santa Maria (UTRA), Ministry of Agriculture, Livestock and Supply, Santa Maria, RS 97050-500, Brazil
| | - Rodrigo Nestor Etges
- Secretary of Agriculture, Livestock and Irrigation (SEAPI), State Government of Rio Grande do Sul, Porto Alegre, RS 90150-900, Brazil
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49
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Fontana S, Pacciarini M, Boifava M, Pellesi R, Casto B, Gastaldelli M, Koehler H, Pozzato N, Casalinuovo F, Boniotti MB. Development and evaluation of two multi-antigen serological assays for the diagnosis of bovine tuberculosis in cattle. J Microbiol Methods 2018; 153:118-126. [DOI: 10.1016/j.mimet.2018.09.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 09/20/2018] [Accepted: 09/20/2018] [Indexed: 01/18/2023]
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50
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Infantes-Lorenzo JA, Whitehead CE, Moreno I, Bezos J, Roy A, Domínguez L, Domínguez M, Salguero FJ. Development and Evaluation of a Serological Assay for the Diagnosis of Tuberculosis in Alpacas and Llamas. Front Vet Sci 2018; 5:189. [PMID: 30151368 PMCID: PMC6099158 DOI: 10.3389/fvets.2018.00189] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/24/2018] [Indexed: 11/16/2022] Open
Abstract
South American camelids are susceptible to tuberculosis, caused mainly by Mycobacterium bovis and M. microti. Despite the tuberculin skin test being the official test for tuberculosis, it has a very low sensitivity in these species (14–20%). Serological tests present the advantages of being rapid, easy to perform and facilitate analysis of large numbers of samples in a short period of time. Novel antigen discovery and evaluation would provide enhanced detection of specific antibodies against members of M. tuberculosis complex. Here, we describe the development and evaluation of an ELISA-type immunoassays to use in the diagnosis of tuberculosis in llamas and alpacas based on P22, a multiprotein complex obtained by affinity chromatography from bovine Purified Protein Derivative (bPPD), that showed high sensitivity and specificity in mice, cattle and goats. This work was performed in two stages. First, a preliminary panel of samples collected from tuberculosis-free (n = 396) and M. bovis-infected herds (n = 56) was assayed, obtaining high specificity (100%) and sensitivity ranging from 63 to 96%. Subsequently, the use of the serological assay was tested using samples from two herds suffering from clinical M. bovis (n = 88) and M. microti (n = 25) infection to evaluate the ability of the ELISA to detect infected animals. 11 out of 88 alpacas were positive to the ELISA in a M. bovis outbreak and 7 out of 25 in a M. microti outbreak. The P22 ELISA potentially provides a sensitive and specific platform for improved tuberculosis surveillance in camelids.
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Affiliation(s)
- Jose A Infantes-Lorenzo
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain.,Department of Pathology and Infectious Diseases, School of Veterinary Medicine, University of Surrey, Guildford, United Kingdom
| | | | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
| | - Alvaro Roy
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Universidad Complutense de Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
| | - Francisco J Salguero
- Department of Pathology and Infectious Diseases, School of Veterinary Medicine, University of Surrey, Guildford, United Kingdom
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