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Novoa MB, Aguirre N, Valentini B, Signorini M, Aznar N, Vanzini V, Torioni-de-Echaide S. Development and Bayesian validation of a competitive inhibition ELISA for detection of antibodies against Brucella abortus in cattle. Acta Trop 2024; 257:107319. [PMID: 38972562 DOI: 10.1016/j.actatropica.2024.107319] [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: 05/17/2024] [Revised: 06/24/2024] [Accepted: 07/04/2024] [Indexed: 07/09/2024]
Abstract
Bovine brucellosis is a zoonotic disease caused by Brucella abortus, responsible for abortions in cows. It is endemic in low- and middle-income countries, where the brucellosis control and eradication programs are based on compulsory vaccination, detection of infected cattle through serologic assays, and culling of infected animals at slaughterhouses. The development of high sensitivity and specificity, and low-cost serologic assays guarantee their implementation in countries where the disease is endemic. The aim of the present study was to develop and validate a competitive inhibition enzyme-linked immune assay (ciELISA) to detect anti-B. abortus antibodies in sera from cattle. The developed ciELISA was validated using 2833 serum samples from dairy and beef cattle. From these, 1515 sera were from uninfected cows that belonged to free of brucellosis herds and 1318 were from infected cows that belonged positive to brucellosis herds. Sera were analyzed with the developed ciELISA, the buffer plate antigen (BPA) test, and the complement fixation test (CFT). The brucellosis status of the herds was officially established according to the country legislation and consistent for at least 5 years and was defined for each cow using the CFT as gold standard. The cutoff for the ciELISA was calculated using a ROC curve and its sensitivity and specificity were analyzed using the Bayesian Latent Class Model (BLCM) approach. The agreement among tests was calculated using the kappa (κ) value. In addition, 15 calves were vaccinated with 3 × 1010 viable cells of B. abortus Strain 19 vaccine, and the dynamics of antibodies were measured by CFT, buffered plate antigen (BPA) test, and the developed ciELISA. The obtained cutoff for ciELISA was ≥ 47 percentage of inhibition (% I), at the BLCM approach the sensitivity was 99.01 % (95 % CI: 97.55-100) and the specificity 98.74 % (95 % CI: 97.68-99.8). The κ between the ciELISA and BPA was κ = 0.88 and between the ciELISA and CFT κ = 0.95. Antibodies against B. abortus were detected in all the vaccinated calves 7 days after vaccination (AV) by the three assays, at day 135 AV all the calves were negative to CFT (15/15), 93.3 % (14/15) to ciELISA and 73.3 % (11/15) to BPA, and at day 190 AV all the calves were negative to the three assays. The developed ciELISA showed a very good performance, could detect the majority of vaccinated animals as negative after 135 days and could be used for the detection of anti-B. abortus antibodies in serum samples for the brucellosis control and eradication program.
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Affiliation(s)
- María Belén Novoa
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina.
| | - Nerina Aguirre
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina
| | - Beatriz Valentini
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina
| | - Marcelo Signorini
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina
| | - Natalia Aznar
- Instituto de Patobiologia, Centro de Investigaciones Veterinarias y Agronomicas (CICVyA), Instituto Nacional de Tecnologia Agropecuaria (INTA), Hurlingam, Buenos Aires, Argentina
| | - Victor Vanzini
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina
| | - Susana Torioni-de-Echaide
- Instituto de Investigación de la Cadena Láctea (INTA-CONICET), Estación Experimental Agropecuaria Rafaela, Ruta 34, km 227, Rafaela, Santa Fe CP 2300, Argentina
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Shams F, Jokar M, Abdous A, Mohammadi P, Abbassioun A, Seuberlich T, Rahmanian V. Seroprevalence of Toxoplasma gondii and Neospora spp. in horse population of Tehran, Iran. Sci Rep 2024; 14:17054. [PMID: 39048639 PMCID: PMC11269710 DOI: 10.1038/s41598-024-61999-z] [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: 03/06/2024] [Accepted: 05/13/2024] [Indexed: 07/27/2024] Open
Abstract
Neospora spp. and Toxoplasma gondii are two closely related protozoan parasites that are widely distributed throughout the world. Horses can act as intermediate hosts for both parasites and can acquire disease. Blood samples were taken from 487 clinically healthy horses from 17 different mechanized stables in Tehran, the capital of Iran, during September and November of 2022. IFAT and ELISA were employed to detect antibodies directed against Neospora spp. and T. gondii. The anti-N. caninum antibodies were detected in 52 of the horses (10.67%) based on IFAT and in 86 of the 487 horses (17.65%) based on the ELISA test. Also, antibodies against T. gondii were detected in 41 horses (8.42%) based on IFAT and in 63 of 487 horses (12.94%) based on the ELISA test. Also, in 6 of the horses (1.23%) based on IFAT and in 13 of the 487 horses (2.67%) based on the ELISA test, double positivity suggested co-infection with both parasites. Gender, age groups, and the presence of dogs for neosporosis, and age groups and the presence of cats for toxoplasmosis, could be considered factors having an influence on the seroprevalences (P < 0.05). The results proved the importance of the urgent implementation of stringent regulatory measures to prevent and control the spread of these parasites.
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Affiliation(s)
- Farzane Shams
- Graduate School for Cellular and Biomedical Sciences, Vetsuisse, University of Bern, Bern, Switzerland
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Mohammad Jokar
- Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Arman Abdous
- Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Pardis Mohammadi
- Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Aryan Abbassioun
- Department of Virology, Faculty of Veterinary Medicine, Tehran University, Tehran, Iran
| | - Torsten Seuberlich
- Graduate School for Cellular and Biomedical Sciences, Vetsuisse, University of Bern, Bern, Switzerland.
- Division of Neurological Sciences, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Vahid Rahmanian
- Department of Public Health, Torbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
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Novoa MB, Soler JP, Cirone KM, Hecker YP, Valentini BS, Primo ME, Moore DP. Use and comparison of serologic assays to detect anti-Neospora caninum antibodies in farmed red deer (Cervus elaphus). Vet Parasitol 2022; 313:109839. [DOI: 10.1016/j.vetpar.2022.109839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 11/11/2022] [Accepted: 11/12/2022] [Indexed: 11/22/2022]
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The global seroprevalence of Neospora caninum infection in deer: a systematic review and meta-analysis study. Small Rumin Res 2022. [DOI: 10.1016/j.smallrumres.2022.106745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Patterns and processes of pathogen exposure in gray wolves across North America. Sci Rep 2021; 11:3722. [PMID: 33580121 PMCID: PMC7881161 DOI: 10.1038/s41598-021-81192-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 12/29/2020] [Indexed: 01/30/2023] Open
Abstract
The presence of many pathogens varies in a predictable manner with latitude, with infections decreasing from the equator towards the poles. We investigated the geographic trends of pathogens infecting a widely distributed carnivore: the gray wolf (Canis lupus). Specifically, we investigated which variables best explain and predict geographic trends in seroprevalence across North American wolf populations and the implications of the underlying mechanisms. We compiled a large serological dataset of nearly 2000 wolves from 17 study areas, spanning 80° longitude and 50° latitude. Generalized linear mixed models were constructed to predict the probability of seropositivity of four important pathogens: canine adenovirus, herpesvirus, parvovirus, and distemper virus-and two parasites: Neospora caninum and Toxoplasma gondii. Canine adenovirus and herpesvirus were the most widely distributed pathogens, whereas N. caninum was relatively uncommon. Canine parvovirus and distemper had high annual variation, with western populations experiencing more frequent outbreaks than eastern populations. Seroprevalence of all infections increased as wolves aged, and denser wolf populations had a greater risk of exposure. Probability of exposure was positively correlated with human density, suggesting that dogs and synanthropic animals may be important pathogen reservoirs. Pathogen exposure did not appear to follow a latitudinal gradient, with the exception of N. caninum. Instead, clustered study areas were more similar: wolves from the Great Lakes region had lower odds of exposure to the viruses, but higher odds of exposure to N. caninum and T. gondii; the opposite was true for wolves from the central Rocky Mountains. Overall, mechanistic predictors were more informative of seroprevalence trends than latitude and longitude. Individual host characteristics as well as inherent features of ecosystems determined pathogen exposure risk on a large scale. This work emphasizes the importance of biogeographic wildlife surveillance, and we expound upon avenues of future research of cross-species transmission, spillover, and spatial variation in pathogen infection.
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Sauvé CC, Hernández-Ortiz A, Jenkins E, Mavrot F, Schneider A, Kutz S, Saliki JT, Daoust PY. Exposure of the Gulf of St. Lawrence grey seal Halichoerus grypus population to potentially zoonotic infectious agents. DISEASES OF AQUATIC ORGANISMS 2020; 142:105-118. [PMID: 33269722 DOI: 10.3354/dao03536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The population of grey seals Halichoerus grypus in Canadian waters is currently used as a commercial source of meat for human consumption. As with domestic livestock, it is important to understand the occurrence in these seals of infectious agents that may be of public health significance and thus ensure appropriate measures are in place to avoid zoonotic transmission. This study examined the prevalence of antibodies against Brucella spp., Erysipelothrix rhusiopathiae, 6 serovars of Leptospira interrogans, and Toxoplasma gondii in 59 grey seals and determined by polymerase chain reaction (PCR) the presence of these potentially zoonotic agents in specific organs and tissues of seropositive animals. The presence of encysted Trichinella spp. larvae was also investigated by digestion of tongue, diaphragm and other muscle samples, but none were detected. Seroprevalence against Brucella spp. and E. rhusiopathiae was low (5 and 3%, respectively). All 59 seals tested had antibodies against L. interrogans, but no carrier of this bacterium was detected by PCR. Seroprevalence against T. gondii was 53%, and DNA of this protozoan was detected by PCR in 11/30 (37%) seropositive animals. Standard sanitary measures mandatory for commercialization of meat products for human consumption should greatly reduce the potential for exposure to these infectious agents. However, special consideration should be given to freezing seal meat for at least 3 d to ensure destruction of tissue cysts of T. gondii.
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Affiliation(s)
- Caroline C Sauvé
- Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada
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Mavrot F, Orsel K, Hutchins W, Adams LG, Beckmen K, Blake JE, Checkley SL, Davison T, Di Francesco J, Elkin B, Leclerc LM, Schneider A, Tomaselli M, Kutz SJ. Novel insights into serodiagnosis and epidemiology of Erysipelothrix rhusiopathiae, a newly recognized pathogen in muskoxen (Ovibos moschatus). PLoS One 2020; 15:e0231724. [PMID: 32315366 PMCID: PMC7173868 DOI: 10.1371/journal.pone.0231724] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 03/30/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Muskoxen are a key species of Arctic ecosystems and are important for food security and socio-economic well-being of many Indigenous communities in the Arctic and Subarctic. Between 2009 and 2014, the bacterium Erysipelothrix rhusiopathiae was isolated for the first time in this species in association with multiple mortality events in Canada and Alaska, raising questions regarding the spatiotemporal occurrence of the pathogen and its potential impact on muskox populations. MATERIALS AND METHODS We adapted a commercial porcine E. rhusiopathiae enzyme-linked immunosorbent assay to test 958 blood samples that were collected from muskoxen from seven regions in Alaska and the Canadian Arctic between 1976 and 2017. The cut-off between negative and positive results was established using mixture-distribution analysis, a data-driven approach. Based on 818 samples for which a serological status could be determined and with complete information, we calculated trends in sample seroprevalences in population time-series and compared them with population trends in the investigated regions. RESULTS Overall, 219/818 (27.8%, 95% Confidence Interval: 24.7-31.0) samples were classified as positive for exposure to E. rhusiopathiae. There were large variations between years and regions. Seropositive animals were found among the earliest serum samples tested; 1976 in Alaska and 1991 in Canada. In Alaskan muskoxen, sample seroprevalence increased after 2000 and, in two regions, peak seroprevalences occurred simultaneously with population declines. In one of these regions, concurrent unusual mortalities were observed and E. rhusiopathiae was isolated from muskox carcasses. In Canada, there was an increase in sample seroprevalence in two muskox populations following known mortality events that had been attributed to E. rhusiopathiae. CONCLUSION Our results indicate widespread exposure of muskoxen to E. rhusiopathiae in western Canada and Alaska. Although not new to the Arctic, we documented an increased exposure to the pathogen in several regions concurrent with population declines. Understanding causes for the apparent increased occurrence of this pathogen and its association with large scale mortality events for muskoxen is critical to evaluate the implications for wildlife and wildlife-dependent human populations in the Arctic.
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Affiliation(s)
- Fabien Mavrot
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Karin Orsel
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Wendy Hutchins
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Layne G. Adams
- US Geological Survey, Alaska Science Center, Sitca, Alaska, United States of America
| | - Kimberlee Beckmen
- Alaska Department of Fish and Game, Juneau, Alaska, United States of America
| | - John E. Blake
- University of Fairbanks, Fairbanks, Alaska, United States of America
| | - Sylvia L. Checkley
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Tracy Davison
- Government of the Northwest Territories, Yellowknife, Northwest Territories, Canada
| | | | - Brett Elkin
- Government of the Northwest Territories, Yellowknife, Northwest Territories, Canada
| | | | - Angela Schneider
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Matilde Tomaselli
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
- Canadian High Arctic Research Station, Polar Knowledge Canada, Ottawa, Nunavut, Canada
| | - Susan J. Kutz
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
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Prevalence of Antibodies against Neospora caninum in Père David's Deer ( Elaphurus davidianus ) in Beijing, China. J Wildl Dis 2017; 52:387-90. [PMID: 27124330 DOI: 10.7589/2015-07-193] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Neospora caninum is an apicomplexan protozoan and causes neuromuscular disorders in canids and abortions in cattle worldwide. We screened sera samples from 49 free-ranging Père David's deer ( Elaphurus davidianus ) in a nature reserve in Beijing, China, for antibodies against N. caninum using indirect fluorescence antibody tests and western blot tests. Antibodies were found in 27% of the deer. Western blot analysis revealed antibody reactivity against immunodominant N. caninum antigens of 16, 25, and 37 kDa in size together with other visible bands.
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Sinnott FA, Monte LG, Collares TF, Silveira RM, Borsuk S. Review on the immunological and molecular diagnosis of neosporosis (years 2011–2016). Vet Parasitol 2017; 239:19-25. [DOI: 10.1016/j.vetpar.2017.04.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 03/31/2017] [Accepted: 04/05/2017] [Indexed: 11/25/2022]
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Moreno‐Torres K, Wolfe B, Saville W, Garabed R. Estimating Neospora caninum prevalence in wildlife populations using Bayesian inference. Ecol Evol 2016; 6:2216-25. [PMID: 27099713 PMCID: PMC4831453 DOI: 10.1002/ece3.2050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 02/01/2016] [Accepted: 02/09/2016] [Indexed: 01/16/2023] Open
Abstract
Prevalence of disease in wildlife populations, which is necessary for developing disease models and conducting epidemiologic analyses, is often understudied. Laboratory tests used to screen for diseases in wildlife populations often are validated only for domestic animals. Consequently, the use of these tests for wildlife populations may lead to inaccurate estimates of disease prevalence. We demonstrate the use of Bayesian latent class analysis (LCA) in determining the specificity and sensitivity of a competitive enzyme-linked immunosorbent assay (cELISA; VMRD (®), Inc.) serologic test used to identify exposure to Neospora caninum (hereafter N. caninum) in three wildlife populations in southeastern Ohio, USA. True prevalence of N. caninum exposure in these populations was estimated to range from 0.1% to 3.1% in American bison (Bison bison), 51.0% to 53.8% in Père David's deer (Elaphurus davidianus), and 40.0% to 45.9% in white-tailed deer (Odocoileus virginianus). The accuracy of the cELISA in American bison and Père David's deer was estimated to be close to the 96% sensitivity and 99% specificity reported by the manufacturer. Sensitivity in white-tailed deer, however, ranged from 78.9% to 99.9%. Apparent prevalence of N. caninum from the test results is not equal to the true prevalence in white-tailed deer and Père David's deer populations. Even when these species inhabit the same community, the true prevalence in the two deer populations differed from the true prevalence in the American bison population. Variances in prevalence for some species suggest differences in the epidemiology of N. caninum for these colocated populations. Bayesian LCA methods could be used as in this example to overcome some of the constraints on validating tests in wildlife species. The ability to accurately evaluate disease status and prevalence in a population improves our understanding of the epidemiology of multihost pathogen systems at the community level.
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Affiliation(s)
- Karla Moreno‐Torres
- Department of Veterinary Preventive MedicineThe Ohio State UniversityColumbusOhio
| | - Barbara Wolfe
- Department of Veterinary Preventive MedicineThe Ohio State UniversityColumbusOhio
- Morris Animal Foundation720 S. Colorado Blvd.Suite 174ADenverColorado
| | - William Saville
- Department of Veterinary Preventive MedicineThe Ohio State UniversityColumbusOhio
| | - Rebecca Garabed
- Department of Veterinary Preventive Medicine and Public Health Preparedness for Infectious Diseases ProgramThe Ohio State UniversityColumbusOhio
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