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Bonilla-Aldana DK, Jiménez-Diaz SD, Lozada-Riascos C, Silva-Cajaleon K, Rodríguez-Morales AJ. Mapping Bovine Tuberculosis in Colombia, 2001-2019. Vet Sci 2024; 11:220. [PMID: 38787192 PMCID: PMC11125619 DOI: 10.3390/vetsci11050220] [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: 03/05/2024] [Revised: 05/05/2024] [Accepted: 05/08/2024] [Indexed: 05/25/2024] Open
Abstract
INTRODUCTION Bovine tuberculosis is a zoonotic disease of significant impact, particularly in countries where a pastoral economy is predominant. Despite its importance, few studies have analysed the disease's behaviour in Colombia, and none have developed maps using geographic information systems (GIS) to characterise it; as such, we developed this study to describe the temporal-spatial distribution of bovine tuberculosis in Colombia over a period of 19 years. METHODS A retrospective cross-sectional descriptive study, based on reports by the Colombian Agricultural Institute (ICA), surveillance of tuberculosis on cattle farms in Colombia from 2001 to 2019 was carried out. The data were converted into databases using Microsoft Access 365®, and multiple epidemiological maps were generated with the QGIS® version 3.36 software coupled to shape files of all the country's departments. RESULTS During the study period, 5273 bovine tuberculosis cases were identified in multiple different departments of Colombia (with a mean of 278 cases/year). Regarding its temporal distribution, the number of cases varied from a maximum of 903 cases (17.12% of the total) in 2015 to a minimum of 0 between 2001 and 2004 and between 2017 and 2019 (between 2005 and 2016, the minimum was 46 cases, 0.87%). CONCLUSIONS GIS are essential for understanding the temporospatial behaviour of zoonotic diseases in Colombia, as is the case for bovine tuberculosis, with its potential implications for the Human and One Health approaches.
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Affiliation(s)
| | - S. Daniela Jiménez-Diaz
- Grupo Colaborativo de Investigación en Enfermedades Transmitidas por Vectores, Zoonóticas y Tropicales de Risaralda (GETZ), Pereira, Risaralda 660001, Colombia;
| | | | - Kenneth Silva-Cajaleon
- Faculty of Environmental Sciences and Health Sciences, Universidad Científica del Sur, Lima 15307, Peru; (K.S.-C.); (A.J.R.-M.)
| | - Alfonso J. Rodríguez-Morales
- Faculty of Environmental Sciences and Health Sciences, Universidad Científica del Sur, Lima 15307, Peru; (K.S.-C.); (A.J.R.-M.)
- Grupo de Investigación Biomedicina, Faculty of Medicine, Fundación Universitaria Autónoma de las Américas-Institución Universitaria Visión de las Américas, Pereira, Risaralda 660003, Colombia
- Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University, Beirut P.O. Box 36-5053, Lebanon
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Is serology a realistic approach for monitoring red deer tuberculosis in the field? Prev Vet Med 2022; 202:105612. [DOI: 10.1016/j.prevetmed.2022.105612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 01/14/2022] [Accepted: 03/14/2022] [Indexed: 01/31/2023]
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Development and evaluation of a multi-antigen serological assay for the intra-vitam diagnosis of Tuberculosis caused by Mycobacterium bovis in pigs. J Immunol Methods 2022; 503:113234. [PMID: 35149055 DOI: 10.1016/j.jim.2022.113234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 01/14/2022] [Accepted: 02/06/2022] [Indexed: 11/21/2022]
Abstract
Bovine Tuberculosis (bTB) is a chronic disease caused by Mycobacterium bovis, affecting cattle and other mammalian species, such as pigs. In the present work, we developed a novel multi-antigen assay (The TB-Luminex multiplex test) to diagnose bTB in pig sera. Moreover, we investigated the seroreactivity to the different antigens employed (MPB83, MPB70, CFP10 and ESAT6) and the possible correlation with bTB lesions distribution in the positive pigs. The serum samples were collected from 59 bTB positive pigs and 186 pigs reared in an officially Tuberculosis free area. Sera were processed according to an optimized protocol for the detection of antibodies by a multiantigen assay using Luminex technology. The positive group showed visible lesions with localized (54.2%) or generalized (45.8%) distribution. Culture confirmed the infection in 62.7% of the cases, and histopathology and intra-vitam assays were used as additional confirmatory tests. Within the set of antigens tested, the immunodominant was MPB83 (positive in 94.9% of the affected pigs), followed by CFP10, MPB70 and ESAT6 (positivity shown in 81.3%, 67.8% and 25.4% of the positive pigs tested, respectively). The best antigens combination was MPB83/CFP10, with a 96.6% sensitivity and 96.8% specificity. Overall, the test showed high sensitivity (98.3% and 86.4%) and specificity (96.2% and 97.8%), if sera were considered positive according to the positivity to a single antigen or at least two antigens, respectively. The TB-Luminex multiplex test results did not give significantly different outcomes according to lesions distribution. Given the present study results, the TB-Luminex multiplex test is a reliable test capable of detecting bTB in most infected pigs with good Se and Sp, regardless of the stage of the disease. In conclusion, multi-antigen tests can be used as individual tests and screening tools for domestic and wild suids within bTB eradication programs.
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Sharma M, Karikalan M, Asok Kumar M, Sree Lakshmi P, Sharma K, Ilayaraja S, Mathur A, Pawde AM. A study on clinical diagnosis of tuberculosis in free ranging and captive wild animals of India. IRANIAN JOURNAL OF VETERINARY RESEARCH 2022; 23:369-374. [PMID: 36874187 PMCID: PMC9984141 DOI: 10.22099/ijvr.2022.44272.6512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/26/2022] [Accepted: 10/02/2022] [Indexed: 03/07/2023]
Abstract
Background Tuberculosis (TB) is a disease of paramount importance at the wildlife-livestock-human interface. Aims To study the occurrence and Mycobacterium (M) species involved in the TB of free-ranging and captive wild animals in various Indian states. Methods A total of 396 clinical samples from 207 different wild animal species from various Indian national parks, zoological gardens, etc., were analyzed by lateral flow assay (LFA), Ziehl-Neelsen (ZN) staining, and PCR. Clinical samples include blood (n=156), faecal swabs (n=103), serum (n=73), and nasal swabs or trunk wash fluids (n=64). Results Clinical signs of TB were absent in 202 animals, although 21 wild animals were seropositive for pathogenic Mycobacterium antigens by LFA. Clinical signs like progressive weight loss, and respiratory distress were exhibited by 4 sloth bears (Melursus ursinus) and an elephant (Elephas maximus), which were also found positive for LFA, PCR, and ZN staining. ZN staining showed positivity for acid-fast bacilli (AFB) in 9 (8.74%) faecal and 9 (14.06%) nasal swabs or trunk wash fluids of sloth bears (7 samples) and elephants (2 samples). M. tuberculosis was detected in 7 sloth bears and 2 elephants, whereas M. bovis was found in a spotted deer (Axis axis) by species-specific PCR. Conclusion The circulation of TB organisms in wild animals warrants a strict surveillance programme to identify the carrier status of these animals so that effective TB control strategies can be formulated.
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Affiliation(s)
- M Sharma
- Ph.D. Student in Pathology, Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
| | - M Karikalan
- Centre for Wildlife Conservation, Management and Disease Surveillance, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
| | - M Asok Kumar
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
| | - P Sree Lakshmi
- Ph.D. Student in Pathology, Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
| | - K Sharma
- Centre for Wildlife Conservation, Management and Disease Surveillance, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
| | - S Ilayaraja
- MSc in Microbiology, Agra Bear Rescue Centre, Wildlife SOS, Keetham-281122, Agra, Uttar Pradesh, India
| | - A Mathur
- MVSc in Surgery and Radiology, Nahargarh Biological Park, Kukas-302028, Rajasthan, India
| | - A M Pawde
- Centre for Wildlife Conservation, Management and Disease Surveillance, ICAR-Indian Veterinary Research Institute, Izatnagar-243122, Bareilly, Uttar Pradesh, India
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Reis AC, Ramos B, Pereira AC, Cunha MV. The hard numbers of tuberculosis epidemiology in wildlife: A meta-regression and systematic review. Transbound Emerg Dis 2021; 68:3257-3276. [PMID: 33296141 DOI: 10.1111/tbed.13948] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 11/08/2020] [Accepted: 12/04/2020] [Indexed: 12/11/2022]
Abstract
Tuberculosis (TB) is a widespread disease that crosses the human and animal health boundaries, with infection being reported in wildlife, from temperate and subtropical to arctic regions. Often, TB in wild species is closely associated with disease occurrence in livestock but the TB burden in wildlife remains poorly quantified on a global level. Through meta-regression and systematic review, this study aimed to summarize global information on TB prevalence in commonly infected wildlife species and to draw a global picture of the scientific knowledge accumulated in wildlife TB. For these purposes, a literature search was conducted through the Web of Science and Google Scholar. The 223 articles retrieved, concerning a 39-year period, were submitted to bibliometric analysis and 54 publications regarding three wildlife hosts fulfilled the criteria for meta-regression. Using a random-effects model, the worldwide pooled TB prevalence in wild boar is higher than for any other species and estimated as 21.98%, peaking in Spain (31.68%), Italy (23.84%) and Hungary (18.12%). The pooled prevalence of TB in red deer is estimated at 13.71%, with Austria (31.58%), Portugal (27.75%), New Zealand (19.26%) and Spain (12.08%) positioning on the top, while for European badger it was computed 11.75%, peaking in the UK (16.43%) and Ireland (22.87%). Despite these hard numbers, a declining trend in wildlife TB prevalence is apparent over the last decades. The overall heterogeneity calculated by multivariable regression ranged from 28.61% (wild boar) to 60.92% (red deer), indicating that other unexplored moderators could explain disease burden. The systematic review shows that the most prolific countries contributing to knowledge related with wildlife TB are settled in Europe and Mycobacterium bovis is the most reported pathogen (89.5%). This study provides insight into the global epidemiology of wildlife TB, ascertaining research gaps that need to be explored and informing how should surveillance be refined.
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Affiliation(s)
- Ana C Reis
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Biosystems & Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Beatriz Ramos
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Biosystems & Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - André C Pereira
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Biosystems & Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Mónica V Cunha
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Biosystems & Integrative Sciences Institute (BioISI), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
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Non-Bovine Species and the Risk to Effective Control of Bovine Viral Diarrhoea (BVD) in Cattle. Pathogens 2021; 10:pathogens10101263. [PMID: 34684212 PMCID: PMC8540666 DOI: 10.3390/pathogens10101263] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/23/2021] [Accepted: 09/27/2021] [Indexed: 12/02/2022] Open
Abstract
Bovine viral diarrhoea virus (BVDV) is an economically important and highly prevalent virus of domestic cattle. Infections with BVDV may lead to both, reproductive and immunological effects that can result in widespread calf losses and increased susceptibility to diseases, such as mastitis and respiratory disease. While BVDV is generally considered to be host specific, it and other Pestivirus species, such as Border disease virus (BDV) in sheep, have been shown to be infecting species other than those from which they were originally isolated from. Recently BVDV was placed on the OIE’s list of notifiable disease and control and eradication programmes for BVDV have been developed throughout much of Europe, the United States, and the United Kingdom. While some countries, including Sweden and Ireland have successfully implemented eradication programmes, other countries such as New Zealand and Australia are still in the early stages of BVDV control. Despite effective control methods, incursions of BVDV into previously cleared herds still occur. While the cause of these incursions is often due to lapses in control methods, the ability of ruminant pestiviruses to infect species other than cattle poses the question as to whether non-bovine species could be impeding the success of BVDV eradication and control. As such, the aim of this review is to make mention of what is known about the cross-species transmission of BVDV, BDV and other pestiviruses between cattle and non-bovine ungulate species and draw conclusions as to the risk non-bovine species pose to the successful control and eradication of BVDV from cattle.
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The Association between Palmer Drought Severity Index Data and Tuberculosis-like Lesions Occurrence in Mediterranean Hunted Wild Boars. Animals (Basel) 2021; 11:ani11072060. [PMID: 34359188 PMCID: PMC8300272 DOI: 10.3390/ani11072060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/03/2021] [Accepted: 07/07/2021] [Indexed: 11/30/2022] Open
Abstract
Simple Summary Climate is one of the most influential factors in the dynamics of tuberculosis in the Mediterranean Iberic wildlife population. In this study, we aim to address how drought as a risk factor influences the occurrence of Tuberculosis-like lesions (TBL) in wild boar inspected in the field. With this focus, our study contributes to pointing out the importance of periods of drought in the increased TBL occurrence in wild boars inspected in the field in the subsequent season. The results of our study allow hunting managers to be advised, in advance, on whether they should adopt extra protective measures when they are aware of the presence of periods of drought. This climate trait can become an alert sign for increased TBL occurrence in the following season, allowing for the implementation of a feasible, timely, and effective measures to control TB in the wild boar population. Abstract In the Iberian Peninsula, the prevalence of tuberculosis differs for each region and for different wild disease hosts and the region affected by a Mediterranean climate will be the most affected. The Mediterranean Iberic regions have a favourable ecosystem for the development of Mycobacterium tuberculosis complex agents, where habitat, population dynamics, and climate (especially drought) are important factors affecting the high prevalence of tuberculosis in the wild boar population. Our objective was to study the association between the Palmer Drought Severity Index (PDSI) and the occurrence of tuberculosis-like lesions (TBL) in wild boar during nine hunting seasons (2008/09 to 2016/17) in Idanha-a-Nova County. To this end, statistical analysis revealed a significant association (p < 0.05) between the occurrence of TBL in wild boar in Idanha-a-Nova County and the analysed risk factor—previous season with periods of drought—which indicated that, when one season experiences some periods of drought, the probability of TBL occurrence in wild boars was 1.2 (OR = 1.2) times higher in the next hunting season than when there were no periods of drought. Therefore, our study contributes to the discovery of a positive effect of periods of drought on the transmission of tuberculosis in Iberian wildlife.
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Animal models for human group 1 CD1 protein function. Mol Immunol 2020; 130:159-163. [PMID: 33384157 DOI: 10.1016/j.molimm.2020.12.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 12/09/2020] [Indexed: 11/21/2022]
Abstract
The CD1 antigen presenting system is evolutionary conserved and found in mammals, birds and reptiles. Humans express five isoforms, of which CD1a, CD1b and CD1c represent the group 1 CD1-molecules. They are recognized by T cells that express diverse αβ-T cell receptors. Investigation of the role of group 1 CD1 function has been hampered by the fact that CD1a, CD1b and CD1c are not expressed by mice. However, other animals, such as guinea pigs or cattle, serve as alternative models and have established basic aspects of CD1-dependent, antimicrobial immune functions. Group 1 CD1 transgenic mouse models became available about ten years ago. In a series of seminal studies these mouse models coined the mechanistical understanding of the role of the corresponding CD1 restricted T cell responses. This review gives a short overview of available animal studies and the lessons that have been and still can be learned.
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Ippolito D, Fiasconaro M, Pruiti Ciarello F, Aliberti A, Vitale M, Amato B, Pasquali P, Di Marco Lo Presti V. Intra-vitam Diagnosis of Tuberculosis in Pigs: Concordance Between Interferon-Gamma Release Assay and Comparative Tuberculin Skin Test. Front Vet Sci 2020; 7:591444. [PMID: 33392284 PMCID: PMC7775594 DOI: 10.3389/fvets.2020.591444] [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: 08/04/2020] [Accepted: 11/13/2020] [Indexed: 01/21/2023] Open
Abstract
The role of pigs in the maintenance of bovine tuberculosis caused by Mycobacterium bovis has been demonstrated in many settings; however, the current control programs usually do not state any intra-vitam diagnostic procedure in this species, as for the cattle. Carcass inspection has shown to be insufficient to detect infection in swine; thus, the assessment of intradermal tuberculin test and interferon-gamma release assay (IGRA) in this species is mandatory. The current study compares the performances of the single intradermal comparative cervical tuberculin (SICCT) test and IGRA. A total of 628 Nebrodi Black pigs raised in free-roaming farms were subjected to the two tests simultaneously. Besides, 124 animals underwent postmortem examination for the detection of tuberculous lesions and isolation of mycobacteria from target organs. The two tests showed a concordance of 94.42% with a Cohen's k coefficient of 0.786 and McNemar chi-square of 4.83 (P = 0.03). Slightly lower levels of concordance (90.32%) between SICCT and IGRA were obtained in the group of 124 animals, with a Cohen's k = 0.797 and McNemar chi-squared value of 0.69 with a non-significant P = 0.41. Moreover, the results showed how IGRA tends to result positive in higher rates, mostly when non-tuberculous mycobacteria (NTM) were isolated, suggesting a possible impairment of specificity in the event of coinfections in the swine. In conclusion, the results obtained support the possibility of the strategic use of IGRA or SICCT in combination or alternatively one to the other, particularly IGRA which showed lower specificity but has evident advantages over SICCT.
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Affiliation(s)
- Dorotea Ippolito
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
| | - Michele Fiasconaro
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
| | - Flavia Pruiti Ciarello
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
| | | | - Maria Vitale
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
| | - Benedetta Amato
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
| | - Paolo Pasquali
- Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy
| | - Vincenzo Di Marco Lo Presti
- Istituo Zooprofilattico Sperimentale della Sicilia "A. Mirri", Area Territoriale Barcellona Pozzo di Gotto, Messina, Italy
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Strong antibody responses to Mycobacterium bovis infection in domestic pigs and potential for reliable serodiagnostics. Vet Immunol Immunopathol 2020; 231:110161. [PMID: 33276278 DOI: 10.1016/j.vetimm.2020.110161] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 11/11/2020] [Accepted: 11/14/2020] [Indexed: 11/21/2022]
Abstract
Mycobacterium bovis (M. bovis), the main cause of animal tuberculosis (TB), can infect a wide variety of domestic and wild animal species, including suids. Suids may serve as reservoir hosts or disease sentinels in different scenarios. Accurate detection of M. bovis infection in pigs is important for TB control programs. Although previous studies have shown the value of serological assays for screening animal populations, the diagnostic accuracy was considered suboptimal. In this study, we used Dual Path Platform (DPP) technology and multi-antigen print immunoassay (MAPIA) to characterize antigen recognition profiles and temporal antibody responses. Four M. bovis experimentally infected pigs developed an early antibody response to antigen MPB83, with a peak in IgG levels starting around 4-6 weeks post-inoculation, although none of the pigs developed antibodies to fusion protein CFP10/ESAT6 within 16 weeks of the experiment. Three of four experimentally infected pigs developed antibody responses before detectable antigen-specific interferon gamma responses. Naturally infected pigs with gross lesions containing viable M. bovis showed IgM (19/40 infected animals) and IgG (39/40) antibody responses to both MPB70/MPB83 (39/40) and CFP10/ESAT6 (34/40). Using MPB70/MPB83 antigen alone to measure IgG antibody levels by DPP assay, an estimated test sensitivity was 97.5 % (95 % CI: 85.3-99.9 %). None of the 57 negative control samples had detectable IgM or IgG antibodies to either of the two test antigens in DPP assay, suggesting an estimated specificity of 100 % (95 % CI: 92.1-100.0 %) in pigs. MAPIA showed robust IgG reactivity to multiple protein antigens of M. bovis in the naturally infected pigs. The results demonstrate that serological assays which detect IgG antibodies to MPB83 have high sensitivity and specificity for accurate detection of M. bovis infection in pigs. Further investigations should be done to validate anti-MPB70/MPB83 antibodies as a reliable serodiagnostic biomarker for TB diagnosis in pigs.
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Crispell J, Cassidy S, Kenny K, McGrath G, Warde S, Cameron H, Rossi G, MacWhite T, White PCL, Lycett S, Kao RR, Moriarty J, Gordon SV. Mycobacterium bovis genomics reveals transmission of infection between cattle and deer in Ireland. Microb Genom 2020; 6:mgen000388. [PMID: 32553050 PMCID: PMC7641417 DOI: 10.1099/mgen.0.000388] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 05/19/2020] [Indexed: 12/13/2022] Open
Abstract
Control of bovine tuberculosis (bTB), caused by Mycobacterium bovis, in the Republic of Ireland costs €84 million each year. Badgers are recognized as being a wildlife source for M. bovis infection of cattle. Deer are thought to act as spillover hosts for infection; however, population density is recognized as an important driver in shifting their epidemiological role, and deer populations across the country have been increasing in density and range. County Wicklow represents one specific area in the Republic of Ireland with a high density of deer that has had consistently high bTB prevalence for over a decade, despite control operations in both cattle and badgers. Our research used whole-genome sequencing of M. bovis sourced from infected cattle, deer and badgers in County Wicklow to evaluate whether the epidemiological role of deer could have shifted from spillover host to source. Our analyses reveal that cattle and deer share highly similar M. bovis strains, suggesting that transmission between these species is occurring in the area. In addition, the high level of diversity observed in the sampled deer population suggests deer may be acting as a source of infection for local cattle populations. These findings have important implications for the control and ultimate eradication of bTB in Ireland.
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Affiliation(s)
- Joseph Crispell
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
- Data Science Campus, Office for National Statistics, Newport, UK
| | - Sophie Cassidy
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Kevin Kenny
- Central Veterinary Research Laboratory, Backweston, County Kildare, Ireland
| | - Guy McGrath
- UCD Centre for Veterinary Epidemiology and Risk Analysis (CVERA), School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Susan Warde
- Central Veterinary Research Laboratory, Backweston, County Kildare, Ireland
| | - Henrietta Cameron
- Central Veterinary Research Laboratory, Backweston, County Kildare, Ireland
| | - Gianluigi Rossi
- Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, UK
- Roslin Institute, University of Edinburgh, Edinburgh, UK
| | - Teresa MacWhite
- Department of Agriculture, Food and the Marine, Backweston, County Kildare, Ireland
| | - Piran C. L. White
- Department of Environment and Geography, University of York, Wentworth Way, York YO10 5NG, UK
| | | | - Rowland R. Kao
- Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, UK
- Roslin Institute, University of Edinburgh, Edinburgh, UK
| | - John Moriarty
- Central Veterinary Research Laboratory, Backweston, County Kildare, Ireland
| | - Stephen V. Gordon
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
- UCD Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, Ireland
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Ghielmetti G, Hilbe M, Friedel U, Menegatti C, Bacciarini L, Stephan R, Bloemberg G. Mycobacterial infections in wild boars (Sus scrofa) from Southern Switzerland: Diagnostic improvements, epidemiological situation and zoonotic potential. Transbound Emerg Dis 2020; 68:573-586. [PMID: 32640107 PMCID: PMC8247353 DOI: 10.1111/tbed.13717] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/29/2020] [Accepted: 07/02/2020] [Indexed: 12/12/2022]
Abstract
The occurrence of mycobacterial infections in different hosts and their implication as obligate or opportunistic pathogens remain mainly unclear. In addition to the well-known pathogenic members of the Mycobacterium tuberculosis - complex (MTBC), over 180 non-tuberculous mycobacteria (NTM) species have been described. Although the large majority of the NTM is assumed to be non-pathogenic to most individuals, an increasing trend in NTM infections has been observed over the last decades. The reasons of such augmentation are probably more than one: improved laboratory diagnostics, an increasing number of immunocompromised patients and individuals with lung damage are some of the possible aspects. Mandibular lymph nodes of 176 hunted wild boars from the pre-Alpine region of Canton Ticino, Switzerland, were collected. Following gross inspection, each lymph node was subjected to culture and to an IS6110 based real-time PCR specific for MTBC members. Histology was performed of a selection of lymph nodes (n = 14) presenting gross visible lesions. Moreover, accuracy of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) species identification was compared with sequence analysis of a combination of housekeeping genes. Mycobacteria of the MTBC were detected in 2.8% of the wild boars (n = 5; CI95% 1.2-6.5) and were all confirmed to be Mycobacterium microti by molecular methods. In addition, based on the examined lymph nodes, NTM were detected in 57.4% (n = 101; CI95% 50.0-64.5) of the wild boars originating from the study area. The 111 isolates belonged to 24 known species and three potentially undescribed Mycobacterium species. M. avium subsp. hominissuis thereby predominated (22.5%) and was found in lymph nodes with and without macroscopic changes. Overall, the present findings show that, with the exception of undescribed Mycobacterium species where identification was not possible (3.6%; 4/111), MALDI-TOF MS had a high concordance rate (90.1%; 100/111 isolates) to the sequence-based reference method.
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Affiliation(s)
- Giovanni Ghielmetti
- Institute for Food Safety and Hygiene, Section of Veterinary Bacteriology, University of Zurich, Zurich, Switzerland
| | - Monika Hilbe
- Institute of Veterinary Pathology, University of Zurich, Zurich, Switzerland
| | - Ute Friedel
- Institute for Food Safety and Hygiene, Section of Veterinary Bacteriology, University of Zurich, Zurich, Switzerland
| | | | | | - Roger Stephan
- Institute for Food Safety and Hygiene, Section of Veterinary Bacteriology, University of Zurich, Zurich, Switzerland
| | - Guido Bloemberg
- Institute for Food Safety and Hygiene, National Reference Center for Enteropathogenic Bacteria and Listeria, University of Zurich, Zurich, Switzerland
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13
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Zimpel CK, Patané JSL, Guedes ACP, de Souza RF, Silva-Pereira TT, Camargo NCS, de Souza Filho AF, Ikuta CY, Neto JSF, Setubal JC, Heinemann MB, Guimaraes AMS. Global Distribution and Evolution of Mycobacterium bovis Lineages. Front Microbiol 2020; 11:843. [PMID: 32477295 PMCID: PMC7232559 DOI: 10.3389/fmicb.2020.00843] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 04/08/2020] [Indexed: 12/31/2022] Open
Abstract
Mycobacterium bovis is the main causative agent of zoonotic tuberculosis in humans and frequently devastates livestock and wildlife worldwide. Previous studies suggested the existence of genetic groups of M. bovis strains based on limited DNA markers (a.k.a. clonal complexes), and the evolution and ecology of this pathogen has been only marginally explored at the global level. We have screened over 2,600 publicly available M. bovis genomes and newly sequenced four wildlife M. bovis strains, gathering 1,969 genomes from 23 countries and at least 24 host species, including humans, to complete a phylogenomic analyses. We propose the existence of four distinct global lineages of M. bovis (Lb1, Lb2, Lb3, and Lb4) underlying the current disease distribution. These lineages are not fully represented by clonal complexes and are dispersed based on geographic location rather than host species. Our data divergence analysis agreed with previous studies reporting independent archeological data of ancient M. bovis (South Siberian infected skeletons at ∼2,000 years before present) and indicates that extant M. bovis originated between 715 and 3,556 years BP, with later emergence in the New World and Oceania, likely influenced by trades among countries.
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Affiliation(s)
- Cristina Kraemer Zimpel
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - José Salvatore L Patané
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.,Laboratory of Cellular Cycle, Butantan Institute, São Paulo, Brazil
| | - Aureliano Coelho Proença Guedes
- Laboratory of Protein Structure and Evolution, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Robson F de Souza
- Laboratory of Protein Structure and Evolution, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Taiana T Silva-Pereira
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - Naila C Soler Camargo
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - Antônio F de Souza Filho
- Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - Cássia Y Ikuta
- Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - José Soares Ferreira Neto
- Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - João Carlos Setubal
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil.,Biocomplexity Institute of Virginia Tech, Blacksburg, VA, United States
| | - Marcos Bryan Heinemann
- Department of Preventive Veterinary Medicine and Animal Health, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil
| | - Ana Marcia Sa Guimaraes
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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14
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Guimaraes AMS, Zimpel CK. Mycobacterium bovis: From Genotyping to Genome Sequencing. Microorganisms 2020; 8:E667. [PMID: 32375210 PMCID: PMC7285088 DOI: 10.3390/microorganisms8050667] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 04/17/2020] [Accepted: 04/21/2020] [Indexed: 12/15/2022] Open
Abstract
Mycobacterium bovis is the main pathogen of bovine, zoonotic, and wildlife tuberculosis. Despite the existence of programs for bovine tuberculosis (bTB) control in many regions, the disease remains a challenge for the veterinary and public health sectors, especially in developing countries and in high-income nations with wildlife reservoirs. Current bTB control programs are mostly based on test-and-slaughter, movement restrictions, and post-mortem inspection measures. In certain settings, contact tracing and surveillance has benefited from M. bovis genotyping techniques. More recently, whole-genome sequencing (WGS) has become the preferential technique to inform outbreak response through contact tracing and source identification for many infectious diseases. As the cost per genome decreases, the application of WGS to bTB control programs is inevitable moving forward. However, there are technical challenges in data analyses and interpretation that hinder the implementation of M. bovis WGS as a molecular epidemiology tool. Therefore, the aim of this review is to describe M. bovis genotyping techniques and discuss current standards and challenges of the use of M. bovis WGS for transmission investigation, surveillance, and global lineages distribution. We compiled a series of associated research gaps to be explored with the ultimate goal of implementing M. bovis WGS in a standardized manner in bTB control programs.
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Affiliation(s)
- Ana M. S. Guimaraes
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, University of São Paulo, São Paulo 01246-904, Brazil;
| | - Cristina K. Zimpel
- Laboratory of Applied Research in Mycobacteria, Department of Microbiology, University of São Paulo, São Paulo 01246-904, Brazil;
- Department of Preventive Veterinary Medicine and Animal Health, University of São Paulo, São Paulo 01246-904, Brazil
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15
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Proud Tembo NF, Bwalya Muma J, Hang’ombe B, Munyeme M. Clustering and spatial heterogeneity of bovine tuberculosis at the livestock/wildlife interface areas in Namwala District of Zambia. Vet World 2020; 13:478-488. [PMID: 32367953 PMCID: PMC7183465 DOI: 10.14202/vetworld.2020.478-488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/29/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND AND AIM Bovine tuberculosis (bTB) remains a major public health issue in Zambia and has been exacerbated by human immunodeficiency virus prevalence and consumption of unpasteurized milk in the Southern Province of the country. The prevalence of bTB has been established to be linked to Kafue Lechwe, which act as reservoir hosts and share grazing fields with domestic cattle. No studies have so far used geographic information system (GIS) to investigate the relationship between the reservoir hosts (Kafue Lechwe) and domestic animals. This study, therefore, aimed to apply GIS to investigate the spatial distribution of bTB in Namwala District of the Southern Province of the country. MATERIALS AND METHODS To investigate the spatial distribution of bTB, geographical positioning system (GPS) coordinates representing 96 cattle herds across 20 independent villages were captured alongside risk factor data. The 96 herds were based on abattoir reports of condemned carcasses and a trace back. Positive herds were confirmed by cross-reference to purified protein derivative tests conducted by the District Veterinary Office. The GPS coordinates were transferred into ArcView 3.2 and laid on the map of Namwala District alongside physical features, including national parks, game management areas, and flood plains. Questionnaires were administered across 96 independent households to assess risk factors of bTB transmission. RESULTS The results revealed a "clustered" spatial distribution of the disease in cattle in Namwala District of Zambia, particularly significant in the eastern interface areas of the district (p=0.006 using Moran's I). Abattoir to production area trace back revealed a herd-level prevalence of 36.4% (95% CI=26.7-46.3%) among cattle herds in Namwala District, whereas individual animal prevalence ranged from 0% to 14% (95% CI=2.4-26.2%). Further, GPS data indicated that the majority of the positive herds were located at the livestock/wildlife interface area. Contacts with wildlife, coupled with sharing grazing, and watering points were found to be significant risk factors for bTB transmission. CONCLUSION This study demonstrated the presence of bTB in cattle and associated spatial risk factors. In particular, bTB was observed to be a function of animal location within the livestock/wildlife interface area. GIS is thus an applicable and important tool in studying disease distribution.
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Affiliation(s)
- Novan Fully Proud Tembo
- Department of Public Health, School of Health Sciences, University of Lusaka, Lusaka, Zambia
| | - John Bwalya Muma
- Department of Disease Control, School of Veterinary Medicine, University of Zambia, Lusaka 10101, Zambia
| | - Bernard Hang’ombe
- Department of Paraclinical Studies, School of Veterinary Medicine, University of Zambia, Lusaka 10101, Zambia
| | - Musso Munyeme
- Department of Disease Control, School of Veterinary Medicine, University of Zambia, Lusaka 10101, Zambia
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16
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Latham ADM, Latham MC, Norbury GL, Forsyth DM, Warburton B. A review of the damage caused by invasive wild mammalian herbivores to primary production in New Zealand. NEW ZEALAND JOURNAL OF ZOOLOGY 2019. [DOI: 10.1080/03014223.2019.1689147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- A. David M. Latham
- Wildlife and Ecology Team, Manaaki Whenua – Landcare Research, Lincoln, New Zealand
| | - M. Cecilia Latham
- Wildlife and Ecology Team, Manaaki Whenua – Landcare Research, Lincoln, New Zealand
| | - Grant L. Norbury
- Wildlife and Ecology Team, Manaaki Whenua – Landcare Research, Alexandra, New Zealand
| | - David M. Forsyth
- NSW Department of Primary Industries, Vertebrate Pest Research Unit, Orange, NSW, Australia
| | - Bruce Warburton
- Wildlife and Ecology Team, Manaaki Whenua – Landcare Research, Lincoln, New Zealand
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17
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Richomme C, Courcoul A, Moyen JL, Reveillaud É, Maestrini O, de Cruz K, Drapeau A, Boschiroli ML. Tuberculosis in the wild boar: Frequentist and Bayesian estimations of diagnostic test parameters when Mycobacterium bovis is present in wild boars but at low prevalence. PLoS One 2019; 14:e0222661. [PMID: 31550287 PMCID: PMC6759143 DOI: 10.1371/journal.pone.0222661] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 09/04/2019] [Indexed: 12/25/2022] Open
Abstract
The Eurasian wild boar (Sus scrofa) is increasingly considered as a relevant actor in the epidemiology of animal tuberculosis (TB). Therefore, monitoring TB in this species is key when establishing comprehensive control schemes for this disease still present in Europe. No data are available on direct and indirect TB diagnostic methods in wild boars in epidemiological contexts where TB is endemic in cattle and detected in wild boars at low prevalence. We aimed to estimate and compare sensitivity and specificity values for bacterial culture, PCR and three commercial ELISAs, i.e. the TB ELISA-VK (using the bPPD antigen), INgezim TB Porcine and IDEXX M. bovis Ab Test (both using the MPB83 and MPB70 antigens), under field conditions in France. We used frequentist methods, with bacteriology as the gold standard, and a Bayesian formulation of the latent class analysis (LCA), without using a gold standard. Submandibular lymph nodes and sera from 495 wild boars hunter-harvested in three endemic areas (Aquitaine region, Côte d’Or region, and Corsica region) were collected between 2014 and 2016. Only eight individuals were positive for M. bovis by bacteriology (1.61%; CI95% 0.70–3.51%). The LCA method provided high specificities (99.2%; CI95% 98.2–99.8% for INgezim TB Porcine and 99.7%; CI95% 98.8–100% for IDEXX M. bovis Ab Test) and sensitivities (78.5%; CI95% 65.1–88.8% for INgezim TB Porcine and 83.9%; CI95% 58.9–97.2% for IDEXX M. bovis Ab Test) for both ELISAs using the MPB83 and MPB70 antigens. Bacterial culture showed limited sensitivity (42.8%; CI95% 19.0–70.6%), estimated as the probability of a positive result in an animal exposed to M. bovis. PCR and ELISA using the bPPD antigens demonstrated high specificities, and sensitivities intermediates between culture and the ELISAs using the MPB83 and MPB70 antigens. These results suggest that ELISA tests using the MPB83 and MPB70 antigens are useful to detect and monitor TB exposure of wild boar populations in field conditions in France.
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Affiliation(s)
- Céline Richomme
- Nancy Laboratory for Rabies and Wildlife, ANSES, Malzéville, France
| | - Aurélie Courcoul
- University Paris-Est, Laboratory for Animal Health, Epidemiology Unit, ANSES, Maisons-Alfort, France
| | - Jean-Louis Moyen
- Laboratoire Départemental d’Analyse et de Recherche de la Dordogne, Coulounieix-Chamiers, France
| | - Édouard Reveillaud
- Unit of Coordination and Support to Surveillance, ANSES, Maisons-Alfort, France
| | | | - Krystel de Cruz
- University Paris-Est, Laboratory for Animal Health, Tuberculosis National Reference Laboratory, ANSES, Maisons-Alfort, France
| | - Antoine Drapeau
- University Paris-Est, Laboratory for Animal Health, Tuberculosis National Reference Laboratory, ANSES, Maisons-Alfort, France
| | - Maria Laura Boschiroli
- University Paris-Est, Laboratory for Animal Health, Tuberculosis National Reference Laboratory, ANSES, Maisons-Alfort, France
- * E-mail:
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18
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Salvador LCM, O'Brien DJ, Cosgrove MK, Stuber TP, Schooley AM, Crispell J, Church SV, Gröhn YT, Robbe-Austerman S, Kao RR. Disease management at the wildlife-livestock interface: Using whole-genome sequencing to study the role of elk in Mycobacterium bovis transmission in Michigan, USA. Mol Ecol 2019; 28:2192-2205. [PMID: 30807679 DOI: 10.1111/mec.15061] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Revised: 01/16/2019] [Accepted: 02/14/2019] [Indexed: 12/30/2022]
Abstract
The role of wildlife in the persistence and spread of livestock diseases is difficult to quantify and control. These difficulties are exacerbated when several wildlife species are potentially involved. Bovine tuberculosis (bTB), caused by Mycobacterium bovis, has experienced an ecological shift in Michigan, with spillover from cattle leading to an endemically infected white-tailed deer (deer) population. It has potentially substantial implications for the health and well-being of both wildlife and livestock and incurs a significant economic cost to industry and government. Deer are known to act as a reservoir of infection, with evidence of M. bovis transmission to sympatric elk and cattle populations. However, the role of elk in the circulation of M. bovis is uncertain; they are few in number, but range further than deer, so may enable long distance spread. Combining Whole Genome Sequences (WGS) for M. bovis isolates from exceptionally well-observed populations of elk, deer and cattle with spatiotemporal locations, we use spatial and Bayesian phylogenetic analyses to show strong spatiotemporal admixture of M. bovis isolates. Clustering of bTB in elk and cattle suggests either intraspecies transmission within the two populations, or exposure to a common source. However, there is no support for significant pathogen transfer amongst elk and cattle, and our data are in accordance with existing evidence that interspecies transmission in Michigan is likely only maintained by deer. This study demonstrates the value of whole genome population studies of M. bovis transmission at the wildlife-livestock interface, providing insights into bTB management in an endemic system.
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Affiliation(s)
- Liliana C M Salvador
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.,Ecology and Evolutionary Biology Department, Princeton University, Princeton, New Jersey.,Royal (Dick) Veterinary School of Veterinary Studies, University of Edinburgh, Midlothian, UK.,Department of Infectious Diseases, College of Veterinary Medicine, Institute of Bioinformatics, University of Georgia, Athens, Georgia
| | - Daniel J O'Brien
- Wildlife Disease Laboratory, Michigan Department of Natural Resources, Lansing, Michigan
| | - Melinda K Cosgrove
- Wildlife Disease Laboratory, Michigan Department of Natural Resources, Lansing, Michigan
| | - Tod P Stuber
- National Veterinary Services Laboratories, Animal and Plant Health Inspection Service, United States Department of Agriculture, Ames, Iowa
| | - Angie M Schooley
- Mycobacteriology Laboratory, Infectious Disease Division, Michigan Department of Health and Human Services, Lansing, Michigan
| | - Joseph Crispell
- School of Veterinary Medicine, College of Health and Agricultural Sciences, University College Dublin, Dublin, Ireland
| | - Steven V Church
- Mycobacteriology Laboratory, Infectious Disease Division, Michigan Department of Health and Human Services, Lansing, Michigan
| | - Yrjö T Gröhn
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Suelee Robbe-Austerman
- National Veterinary Services Laboratories, Animal and Plant Health Inspection Service, United States Department of Agriculture, Ames, Iowa
| | - Rowland R Kao
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.,Royal (Dick) Veterinary School of Veterinary Studies, University of Edinburgh, Midlothian, UK
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19
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More SJ. Can bovine TB be eradicated from the Republic of Ireland? Could this be achieved by 2030? Ir Vet J 2019; 72:3. [PMID: 31057791 PMCID: PMC6485114 DOI: 10.1186/s13620-019-0140-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 04/02/2019] [Indexed: 12/23/2022] Open
Abstract
Background There has been an ongoing decline in bovine tuberculosis (TB) in the Republic of Ireland, however, TB has yet to be eradicated. Further to a recent commitment by the Irish government to eradicate TB by 2030, this paper considers two questions, ‘Can bovine TB be eradicated from the Republic of Ireland?’ and ‘Could this be achieved by 2030?’, given current knowledge from research. Main body of the abstract Until very recently, Ireland has lacked key tools required for eradication. This gap has substantially been filled with the national roll-out of badger vaccination. Nonetheless, there is robust evidence, drawn from general national research, international experiences, and results of a recent modelling study, to suggest that all current strategies plus badger vaccination will not be sufficient to successfully eradicate TB from Ireland by 2030. We face a critical decision point in the programme, specifically the scope and intensity of control measures from this point forward. Adequate information is available, both from research and international experience, to indicate that these additional measures should broadly focus on adequately addressing TB risks from wildlife, implementing additional risk-based cattle controls, and enhancing industry engagement. These three areas are considered in some detail. Conclusion Based on current knowledge, it will not be possible to eradicate TB by 2030 with current control strategies plus national badger vaccination. Additional measures will be needed if Ireland is to eradicate TB within a reasonable time frame. Decisions made now will have long-term implications both in terms of time-to-eradication and cumulative programme costs.
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Affiliation(s)
- Simon J More
- Centre for Veterinary Epidemiology and Risk Analysis, UCD School of Veterinary Medicine, University College Dublin, Belfield, Dublin, D04 W6F6 Ireland
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20
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Nigsch A, Glawischnig W, Bagó Z, Greber N. Mycobacterium caprae Infection of Red Deer in Western Austria-Optimized Use of Pathology Data to Infer Infection Dynamics. Front Vet Sci 2019; 5:350. [PMID: 30719435 PMCID: PMC6348259 DOI: 10.3389/fvets.2018.00350] [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: 07/29/2018] [Accepted: 12/31/2018] [Indexed: 11/29/2022] Open
Abstract
Austria is officially bovine tuberculosis (TB) free, but during the last decade the west of the country experienced sporadic TB cases in cattle. Free-ranging red deer are known to be the maintenance host of Mycobacterium (M.) caprae in certain areas in Austria, where cattle can become infected on alpine pastures shared with deer. The epidemiology of TB in deer in alpine regions is still poorly understood. To inform decisions on efficient interventions against TB in deer, a method is needed to better capture the infection dynamics on population level. A total of 4,521 free-ranging red deer from Austria's most western Federal state Vorarlberg were TB-tested between 2009 and 2018. M. caprae was confirmed in samples from 257 animals. Based on descriptions of TB-like lesions, TB positive animals were categorized with a newly developed lesion score called “Patho Score.” Analyses using this Patho Score allowed us to distinguish between endemic, epidemic and sporadic TB situations and revealed different roles of subgroups of infected deer in infection dynamics. Overall, deer in poor condition, deer of older age and stags were the subgroups that were significantly more often TB positive (p = 0.02 or smaller for all subgroups). Deer in poor condition (p < 0.001) and stags (p = 0.04) also showed more often advanced lesions, indicating their role in mycobacterial spread. TB was never detected in fawns, while hinds were the subgroup that showed the fewest advanced lesions. Analysis of outbreaks of TB and lesion development in yearlings provided some evidence for the role of winter feeding as a source for increased infection transmission. Sporadic cases in TB-free areas appear to precede outbreaks in these areas. These currently TB-free areas should receive particular attention in sampling schemes to be able to detect early spreading of the infection. The Patho Score is a quick, easy-to-apply and reproducible tool that provides new insights on the epidemiology of TB in deer at population level and is flexible enough to relate heterogeneous wildlife monitoring data collected following different sampling plans. This lesion score was used for systematic assessment of infection dynamics of mycobacterial infections.
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Affiliation(s)
- Annette Nigsch
- Department of Animal Sciences, Quantitative Veterinary Epidemiology, Wageningen University, Wageningen, Netherlands
| | - Walter Glawischnig
- Institute for Veterinary Disease Control, Austrian Agency for Health and Food Safety, Innsbruck and Mödling, Mödling, Austria
| | - Zoltán Bagó
- Institute for Veterinary Disease Control, Austrian Agency for Health and Food Safety, Innsbruck and Mödling, Mödling, Austria
| | - Norbert Greber
- Department for Veterinary Affairs, Office of the State Government of Vorarlberg, Bregenz, Austria
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21
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Gormley E, Corner LAL. Wild Animal Tuberculosis: Stakeholder Value Systems and Management of Disease. Front Vet Sci 2018; 5:327. [PMID: 30622951 PMCID: PMC6308382 DOI: 10.3389/fvets.2018.00327] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 12/10/2018] [Indexed: 11/13/2022] Open
Abstract
When human health is put at risk from the transmission of animal diseases, the options for intervention often require input from stakeholders whose differing values systems contribute to decisions on disease management. Animal tuberculosis (TB), caused principally by Mycobacterium bovis is an archetypical zoonotic pathogen in that it can be transmitted from animals to humans and vice versa. Although elimination of zoonotic transmission of TB to humans is frequently promoted as the raison d'être for TB management in livestock, in many countries the control strategies are more likely based on minimizing the impact of sustained infection on the agricultural industry. Where wild animals are implicated in the epidemiology of the disease, the options for control and eradication can require involvement of additional stakeholder groups. Conflict can arise when different monetary and/or societal values are assigned to the affected animals. This may impose practical and ethical dilemmas for decision makers where one or more species of wild animal is seen by some stakeholders to have a greater value than the affected livestock. Here we assess the role of stakeholder values in influencing TB eradication strategies in a number of countries including Ireland, the UK, the USA, Spain, France, Australia, New Zealand and South Africa. What it reveals is that the level of stakeholder involvement increases with the complexity of the epidemiology, and that similar groups of stakeholders may agree to a set of control and eradication measures in one region only to disagree with applying the same measures in another. The level of consensus depends on the considerations of the reservoir status of the infected host, the societal values assigned to each species, the type of interventions proposed, ethical issues raised by culling of sentient wild animals, and the economic cost benefit effectiveness of dealing with the problem in one or more species over a long time frame. While there is a societal benefit from controlling TB, the means to achieve this requires identification and long-term engagement with all key stakeholders in order to reach agreement on ethical frameworks that prioritize and justify control options, particularly where culling of wild animals is concerned.
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Affiliation(s)
- Eamonn Gormley
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - Leigh A L Corner
- School of Veterinary Medicine, University College Dublin, Dublin, Ireland
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22
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Cripps JK, Pacioni C, Scroggie MP, Woolnough AP, Ramsey DSL. Introduced deer and their potential role in disease transmission to livestock in Australia. Mamm Rev 2018. [DOI: 10.1111/mam.12142] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jemma K. Cripps
- Department of Environment, Land, Water and Planning; Arthur Rylah Institute for Environmental Research; Heidelberg Vic. 3084 Australia
- School of BioSciences; University of Melbourne; Melbourne Vic. 3010 Australia
| | - Carlo Pacioni
- Department of Environment, Land, Water and Planning; Arthur Rylah Institute for Environmental Research; Heidelberg Vic. 3084 Australia
- School of BioSciences; University of Melbourne; Melbourne Vic. 3010 Australia
| | - Michael P. Scroggie
- Department of Environment, Land, Water and Planning; Arthur Rylah Institute for Environmental Research; Heidelberg Vic. 3084 Australia
- School of BioSciences; University of Melbourne; Melbourne Vic. 3010 Australia
| | - Andrew P. Woolnough
- Department of Economic Development, Jobs, Transport and Resources; 475 Mickleham Road Attwood Vic. 3049 Australia
| | - David S. L. Ramsey
- Department of Environment, Land, Water and Planning; Arthur Rylah Institute for Environmental Research; Heidelberg Vic. 3084 Australia
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23
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Nugent G, Gormley AM, Anderson DP, Crews K. Roll-Back Eradication of Bovine Tuberculosis (TB) From Wildlife in New Zealand: Concepts, Evolving Approaches, and Progress. Front Vet Sci 2018; 5:277. [PMID: 30483516 PMCID: PMC6240584 DOI: 10.3389/fvets.2018.00277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 10/18/2018] [Indexed: 11/22/2022] Open
Abstract
The New Zealand government and agricultural industries recently jointly adopted the goal of nationally eradicating bovine tuberculosis (TB) from livestock and wildlife reservoirs by 2055. Only Australia has eradicated TB from a wildlife maintenance host. Elsewhere the disease is often self-sustaining in a variety of wildlife hosts, usually making eradication an intractable problem. The New Zealand strategy for eradicating TB from wildlife is based on quantitative assessment using a Bayesian “Proof of Freedom” framework. This is used to assess the probability that TB has been locally eradicated from a given area. Here we describe the framework (the concepts, methods and tools used to assess TB freedom and how they are being applied and updated). We then summarize recent decision theory research aimed at optimizing the balance between the risk of falsely declaring areas free and the risk of overspending on disease management when the disease is already locally extinct. We explore potential new approaches for further optimizing the allocation of management resources, especially for places where existing methods are impractical or expensive, including using livestock as sentinels. We also describe how the progressive roll-back of locally eradicated areas scales up operationally and quantitatively to achieve and confirm eradication success over the entire country. Lastly, we review the progress made since the framework was first formally adopted in 2011. We conclude that eradication of TB from New Zealand is feasible, and that we are well on the way to achieving this outcome.
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Affiliation(s)
- Graham Nugent
- Manaaki Whenua - Landcare Research, Lincoln, New Zealand
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Thomas J, Infantes-Lorenzo JA, Moreno I, Cano-Terriza D, de Juan L, García-Bocanegra I, Domínguez L, Domínguez M, Gortázar C, Risalde MA. Validation of a new serological assay for the identification of Mycobacterium tuberculosis complex-specific antibodies in pigs and wild boar. Prev Vet Med 2018; 162:11-17. [PMID: 30621888 DOI: 10.1016/j.prevetmed.2018.11.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Revised: 10/11/2018] [Accepted: 11/05/2018] [Indexed: 01/31/2023]
Abstract
BACKGROUND AND OBJECTIVES Animal tuberculosis (TB) is a multi-host disease involving a wide variety of domestic and wild mammals and causing a significant economic burden and sanitary problems. Wild boar and domestic pigs (Sus scrofa) are indicators of the circulation of the Mycobacterium tuberculosis complex (MTC) and can play a role in its maintenance. The proper diagnosis of MTC contact in these species is, therefore, a key factor as regards controlling TB. The objective of the current study is to evaluate the diagnostic performance of the protein complex P22 as a candidate for use in an in-house ELISA to identify M. tuberculosis complex-specific antibodies for the diagnosis of TB in comparison to the commonly used bPPD-based ELISA (bPPD ELISA) in suids. METHODS We conducted a retrospective study. Sera were collected from wild boar during hunting season and from domestic pigs during routine handling, and all the animals underwent reference standard tests (detailed necropsy followed by bacteriological culture and isolation). Animal TB was confirmed to be positive in 277 animals and negative in 366 animals based on both reference standard tests. Sera from those animals were tested by P22 ELISA as well as bPPD ELISA. RESULTS Both ELISAs yielded a good diagnostic value, however, a higher sensitivity (Se) and specificity (Sp) was achieved with the P22 ELISA (Se: 84.1%; CI95%: 79.3-88.2% / Sp: 98.4%; CI95%:96.5-99.4%) when compared to the bPPD ELISA (Se: 77.3%; CI95%: 71.9-82.2% / Sp: 97.3%; CI95%: 95-98.3%). An optimum Sp of 100% (CI95%: 98.54-100%) was attained with white pigs for both the bPPD and the P22 ELISA. DISCUSSION The results suggest that serological tests for MTC-antibody detection, and particularly the P22 ELISA, are valuable tools in the diagnosis of TB in wild boar and domestic pigs when attempting to detect contact with MTC and thereby facilitate TB control and management.
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Affiliation(s)
- Jobin Thomas
- SaBio (Health and Biotechnology), Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM), Ciudad Real, Spain; Indian Council of Agricultural Research (ICAR), New Delhi, India
| | - Jose A Infantes-Lorenzo
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain
| | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - David Cano-Terriza
- Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad de Córdoba (UCO), Agrifood Excellence International Campus (ceiA3), Córdoba, Spain
| | - Lucía de Juan
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain
| | - Ignacio García-Bocanegra
- Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad de Córdoba (UCO), Agrifood Excellence International Campus (ceiA3), Córdoba, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Dpto. de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - Christian Gortázar
- SaBio (Health and Biotechnology), Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM), Ciudad Real, Spain.
| | - María A Risalde
- Dpto. de Anatomía y Anatomía Patológica Comparadas, Facultad de Veterinaria, Universidad de Córdoba (UCO), Agrifood Excellence International Campus (ceiA3), Córdoba, Spain; Infectious Diseases Unit. Instituto Maimonides de Investigación Biomédica de Córdoba (IMIBIC). Hospital Universitario Reina Sofía de Córdoba. Universidad de Córdoba. Cordoba, Spain
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Cano-Terriza D, Risalde MA, Rodríguez-Hernández P, Napp S, Fernández-Morente M, Moreno I, Bezos J, Fernández-Molera V, Sáez JL, García-Bocanegra I. Epidemiological surveillance of Mycobacterium tuberculosis complex in extensively raised pigs in the south of Spain. Prev Vet Med 2018; 159:87-91. [DOI: 10.1016/j.prevetmed.2018.08.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 08/30/2018] [Accepted: 08/30/2018] [Indexed: 10/28/2022]
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Roos EO, Olea-Popelka F, Buss P, de Klerk-Lorist LM, Cooper D, van Helden PD, Parsons SDC, Miller MA. Seroprevalence of Mycobacterium bovis infection in warthogs (Phacochoerus africanus) in bovine tuberculosis-endemic regions of South Africa. Transbound Emerg Dis 2018. [PMID: 29520985 DOI: 10.1111/tbed.12856] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Bovine tuberculosis (bTB), caused by Mycobacterium bovis (M. bovis), has been reported in many species including suids. Wild boar are important maintenance hosts of the infection with other suids, that is domestic and feral pigs, being important spillover hosts in the Eurasian ecosystem and in South Africa, warthogs (Phacochoerus africanus) may play a similar role in M. bovis-endemic areas. However, novel diagnostic tests for warthogs are required to investigate the epidemiology of bTB in this species. Recent studies have demonstrated that serological assays are capable of discriminating between M. bovis-infected and uninfected warthogs (Roos et al., ). In this study, an indirect ELISA utilizing M. bovis purified protein derivative (PPD) as a test antigen was used to measure the prevalence and investigate risk factors associated with infection in warthogs from uMhkuze Nature Reserve and the southern region of the Greater Kruger National Park (GKNP). There was a high overall seroprevalence of 38%, with adult warthogs having a higher risk of infection (46%). Seroprevalence also varied by geographic location with warthogs from Marloth Park in the GKNP having the greatest percentage of positive animals (63%). This study indicates that warthogs in M. bovis-endemic areas are at high risk of becoming infected with mycobacteria. Warthogs might present an under-recognized disease threat in multi-species systems. They might also serve as convenient sentinels for M. bovis in endemic areas. These findings highlight the importance of epidemiological studies in wildlife to understand the role each species plays in disease ecology.
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Affiliation(s)
- E O Roos
- Department of Science and Technology/National Research Foundation Centre of Excellence for Biomedical TB Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - F Olea-Popelka
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA
| | - P Buss
- Veterinary Wildlife Services, South African National Parks, Kruger National Park, Skukuza, South Africa
| | - L-M de Klerk-Lorist
- Office of the State Veterinarian, Kruger National Park, Department of Agriculture, Forestry and Fisheries, Skukuza, South Africa
| | - D Cooper
- Ezemvelo KZN Wildlife, Mtubatuba, South Africa
| | - P D van Helden
- Department of Science and Technology/National Research Foundation Centre of Excellence for Biomedical TB Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - S D C Parsons
- Department of Science and Technology/National Research Foundation Centre of Excellence for Biomedical TB Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - M A Miller
- Department of Science and Technology/National Research Foundation Centre of Excellence for Biomedical TB Research, South African Medical Research Council Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
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27
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Efficacy of oral BCG vaccination in protecting free-ranging cattle from natural infection by Mycobacterium bovis. Vet Microbiol 2017; 208:181-189. [PMID: 28888636 DOI: 10.1016/j.vetmic.2017.07.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 07/27/2017] [Accepted: 07/27/2017] [Indexed: 11/22/2022]
Abstract
Vaccination of cattle against bovine tuberculosis could be a valuable control strategy, particularly in countries faced with intractable ongoing infection from a disease reservoir in wildlife. A field vaccination trial was undertaken in New Zealand. The trial included 1286 effectively free-ranging cattle stocked at low densities in a remote 7600ha area, with 55% of them vaccinated using Mycobacterium bovis BCG (Danish strain 1311). Vaccine was administered orally in all but 34 cases (where it was injected). After inclusion, cattle were exposed to natural sources of M. bovis infection in cattle and wildlife, most notably the brushtail possum (Trichosurus vulpecula). Cattle were slaughtered at 3-5 years of age and were inspected for tuberculous lesions, with mycobacteriological culture of key tissues from almost all animals. The prevalence of M. bovis infection was 4.8% among oral BCG vaccinates, significantly lower than the 11.9% in non-vaccinates. Vaccination appeared to both reduce the incidence of detectable infection, and to slow disease progression. Based on apparent annual incidence, the protective efficacy of oral BCG vaccine was 67.4% for preventing infection, and was higher in cattle slaughtered soon after vaccination. Skin-test reactivity to tuberculin was high in vaccinates re-tested 70days after vaccination but not in non-vaccinates, although reactor animals had minimal response in gamma-interferon blood tests. In re- tests conducted more than 12 months after vaccination, skin-test reactivity among vaccinates was much lower. These results indicate that oral BCG vaccination could be an effective tool for greatly reducing detectable infection in cattle.
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Katale BZ, Mbugi EV, Siame KK, Keyyu JD, Kendall S, Kazwala RR, Dockrell HM, Fyumagwa RD, Michel AL, Rweyemamu M, Streicher EM, Warren RM, van Helden P, Matee MI. Isolation and Potential for Transmission of Mycobacterium bovis at Human-livestock-wildlife Interface of the Serengeti Ecosystem, Northern Tanzania. Transbound Emerg Dis 2017; 64:815-825. [PMID: 26563417 PMCID: PMC5434928 DOI: 10.1111/tbed.12445] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Indexed: 11/30/2022]
Abstract
Mycobacterium bovis, the causative agent of bovine tuberculosis (bTB), is a multihost pathogen of public health and veterinary importance. We characterized the M. bovis isolated at the human-livestock-wildlife interface of the Serengeti ecosystem to determine the epidemiology and risk of cross-species transmission between interacting hosts species. DNA was extracted from mycobacterial cultures obtained from sputum samples of 472 tuberculosis (TB) suspected patients and tissue samples from 606 livestock and wild animal species. M. bovis isolates were characterized using spoligotyping and Mycobacterial Interspersed Repetitive Units-Variable Tandem Repeats (MIRU-VNTR) on 24 loci. Only 5 M. bovis were isolated from the cultured samples. Spoligotyping results revealed that three M. bovis isolates from two buffaloes (Syncerus caffer) and 1 African civet (Civettictis civetta) belonged to SB0133 spoligotype. The two novel strains (AR1 and AR2) assigned as spoligotype SB2290 and SB2289, respectively, were identified from indigenous cattle (Bos indicus). No M. bovis was detected from patients with clinical signs consistent with TB. Of the 606 animal tissue specimens and sputa of 472 TB-suspected patients 43 (7.09%) and 12 (2.9%), respectively, yielded non-tuberculous mycobacteria (NTM), of which 20 isolates were M. intracellulare. No M. avium was identified. M. bovis isolates from wildlife had 45.2% and 96.8% spoligotype pattern agreement with AR1 and AR2 strains, respectively. This finding indicates that bTB infections in wild animals and cattle were epidemiologically related. Of the 24 MIRU-VNTR loci, QUB 11b showed the highest discrimination among the M. bovis strains. The novel strains obtained in this study have not been previously reported in the area, but no clear evidence for recent cross-species transmission of M. bovis was found between human, livestock and wild animals.
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Affiliation(s)
- B. Z. Katale
- Department of Microbiology and ImmunologySchool of MedicineMuhimbili University of Health and Allied Sciences (MUHAS)Dar es SalaamTanzania
- Tanzania Wildlife Research Institute (TAWIRI)ArushaTanzania
| | - E. V. Mbugi
- Department of Microbiology and ImmunologySchool of MedicineMuhimbili University of Health and Allied Sciences (MUHAS)Dar es SalaamTanzania
| | - K. K. Siame
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research/SAMRC Centre for Tuberculosis ResearchDivision of Molecular Biology and Human GeneticsFaculty of Medicine and Health SciencesStellenbosch UniversityTygerbergCape TownSouth Africa
| | - J. D. Keyyu
- Tanzania Wildlife Research Institute (TAWIRI)ArushaTanzania
| | - S. Kendall
- Centre for Emerging, Endemic and Exotic diseasesRoyal Veterinary College (RVC)Hawkshead LaneNorth MymmsHatfieldHertfordshireUK
| | - R. R. Kazwala
- Department of Veterinary Medicine and Public HealthFaculty of Veterinary MedicineSokoine University of Agriculture (SUA)MorogoroTanzania
| | - H. M. Dockrell
- Department of Immunology and InfectionLondon School of Hygiene and Tropical Medicine (LSHTM)LondonUK
| | - R. D. Fyumagwa
- Tanzania Wildlife Research Institute (TAWIRI)ArushaTanzania
| | - A. L. Michel
- Department Veterinary Tropical DiseasesFaculty of Veterinary ScienceUniversity of PretoriaOnderstepoortSouth Africa
| | - M. Rweyemamu
- Southern African Centre for Infectious Diseases Surveillance (SACIDS)Sokoine University of Agriculture (SUA)Chuo KikuuMorogoroTanzania
| | - E. M. Streicher
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research/SAMRC Centre for Tuberculosis ResearchDivision of Molecular Biology and Human GeneticsFaculty of Medicine and Health SciencesStellenbosch UniversityTygerbergCape TownSouth Africa
| | - R. M. Warren
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research/SAMRC Centre for Tuberculosis ResearchDivision of Molecular Biology and Human GeneticsFaculty of Medicine and Health SciencesStellenbosch UniversityTygerbergCape TownSouth Africa
| | - P. van Helden
- DST/NRF Centre of Excellence for Biomedical Tuberculosis Research/SAMRC Centre for Tuberculosis ResearchDivision of Molecular Biology and Human GeneticsFaculty of Medicine and Health SciencesStellenbosch UniversityTygerbergCape TownSouth Africa
| | - M. I. Matee
- Department of Microbiology and ImmunologySchool of MedicineMuhimbili University of Health and Allied Sciences (MUHAS)Dar es SalaamTanzania
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Amato B, Capucchio TM, Biasibetti E, Mangano E, Boniotti BM, Pacciarini LM, Migliore S, Vitale M, Fiasconaro M, Di Marco Lo Presti V. Pathology and genetic findings in a rare case of Mycobacterium caprae infection in a sow. Vet Microbiol 2017. [PMID: 28622866 DOI: 10.1016/j.vetmic.2017.05.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Bovine tuberculosis, a reemerging zoonosis in diverse ecological scenarios, has been reported in the autochthonous Nebrodi black pig breed population used for meat production in Italy. During a routine abattoir inspection in 2013, 24 of 299 carcasses (8%) of Nebrodi black pigs presented tuberculosis-like lesions at pathologic examination. Mycobacterium bovis was isolated from 23 animals and M. caprae from a 3-year-old sow. The sow showed severe diffuse lesions involving the visceral organs, right coxofemoral joint, and mammary glands. Isolation of M. caprae from mammary glands is uncommon, with only one other case involving a sow reported so far; however, Mycobacteria infection of the mammary glands may be transmitted from lactating sows to piglets, contributing to the spread and maintenance of bovine tuberculosis in swine. Genotyping analysis showed M. caprae spoligotype SB0866 and profile 4,1,5,4,4,11,4,2,4,3,8,7 MIRU-VNTR (mycobacterial interspersed repetitive units-variable number of tandem repeats). The worldwide prevalence of this spoligotype is very low. The finding of severe, diffuse tuberculous lesions strongly suggests that Nebrodi black pigs are susceptible for Mycobacterium spp. and that they might act as a distributor for these microorganisms. Since natural ecosystems with multiple contacts among different livestock species and wild animals are very common in Mediterranean regions, current surveillance and eradication plans for bovine tuberculosis will need to be extended to other potential reservoir species in regions where extensive and traditional breeding systems are operated.
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Affiliation(s)
- Benedetta Amato
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy
| | - Teresa Maria Capucchio
- Dipartimento di Scienze Veterinarie - Università degli Studi di Torino, Largo Braccini 2, Grugliasco, TO 10195, Italy
| | - Elena Biasibetti
- Dipartimento di Scienze Veterinarie - Università degli Studi di Torino, Largo Braccini 2, Grugliasco, TO 10195, Italy
| | - Elena Mangano
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy
| | - Beatrice Maria Boniotti
- National Reference Centre for Bovine Tuberculosis, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna, via Bianchi 7/9, Brescia, 25124, Italy
| | - Lodovica Maria Pacciarini
- National Reference Centre for Bovine Tuberculosis, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna, via Bianchi 7/9, Brescia, 25124, Italy
| | - Sergio Migliore
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy
| | - Maria Vitale
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy.
| | - Michele Fiasconaro
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy
| | - Vincenzo Di Marco Lo Presti
- Istituto Zooprofilattico Sperimentale della Sicilia, via S. Andrea 96, Barcellona Pozzo di Gotto, ME, 98051, Italy
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Gormley AM, Anderson DP, Nugent G. Cost-based optimization of the stopping threshold for local disease surveillance during progressive eradication of tuberculosis from New Zealand wildlife. Transbound Emerg Dis 2017; 65:186-196. [PMID: 28391623 DOI: 10.1111/tbed.12647] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Indexed: 11/30/2022]
Abstract
Bovine tuberculosis (TB) is managed in New Zealand largely via population reduction of the major wildlife disease reservoir of Mycobacterium bovis, the introduced brushtail possum Trichosurus vulpecula. New Zealand aims to eradicate M. bovis infection from its livestock and wildlife within 40 years, as the culmination of progressive regional eradication programmes. Declarations of regional eradication are decided after extensive possum population control and post-control surveillance; hence, we developed a modelling framework, based on eco-epidemiological simulation data, to provide cost-evaluated options for deciding when to make these declarations. A decision-support framework evaluated potential costs of wildlife surveillance (and recontrol, if required) with respect to the calculated probability of successful eradication of M. bovis from wildlife. This enabled expected costs to be predicted in terms of stopping thresholds, allowing selection of optimal stopping rules based on minimizing costs. We identified factors that could influence optimal stopping values applied during regional eradication. Where vector/disease surveillance was inexpensive (for example, using low-cost detection devices or sentinel wildlife hosts) optimization involved setting a higher rather than lower stopping value, as it would be cheaper to minimize the risk of making a false declaration of eradication than to remedy any such failure. In addition, any cost of recontrol would largely depend on the time to rediscovery of residual M. bovis infection in wildlife, which would in turn be linked to the level of ongoing passive surveillance (with more rapid detection of re-emergent infection among wildlife in farmland situations than in remote forested regions). These two scenarios would favour different optimal stopping rules, as would the consideration of stakeholder confidence and socio-political issues, which are discussed. The framework presented here provides guidance to assess the economics underlying eradication of bovine TB from New Zealand farming; this eliminates reliance upon a pre-determined and uniform stopping rule for ceasing active management.
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Affiliation(s)
| | | | - G Nugent
- Landcare Research, Lincoln, New Zealand
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31
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Crispell J, Zadoks RN, Harris SR, Paterson B, Collins DM, de-Lisle GW, Livingstone P, Neill MA, Biek R, Lycett SJ, Kao RR, Price-Carter M. Using whole genome sequencing to investigate transmission in a multi-host system: bovine tuberculosis in New Zealand. BMC Genomics 2017; 18:180. [PMID: 28209138 PMCID: PMC5314462 DOI: 10.1186/s12864-017-3569-x] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 02/09/2017] [Indexed: 12/13/2022] Open
Abstract
Background Bovine tuberculosis (bTB), caused by Mycobacterium bovis, is an important livestock disease raising public health and economic concerns around the world. In New Zealand, a number of wildlife species are implicated in the spread and persistence of bTB in cattle populations, most notably the brushtail possum (Trichosurus vulpecula). Whole Genome Sequenced (WGS) M. bovis isolates sourced from infected cattle and wildlife across New Zealand were analysed. Bayesian phylogenetic analyses were conducted to estimate the substitution rate of the sampled population and investigate the role of wildlife. In addition, the utility of WGS was examined with a view to these methods being incorporated into routine bTB surveillance. Results A high rate of exchange was evident between the sampled wildlife and cattle populations but directional estimates of inter-species transmission were sensitive to the sampling strategy employed. A relatively high substitution rate was estimated, this, in combination with a strong spatial signature and a good agreement to previous typing methods, acts to endorse WGS as a typing tool. Conclusions In agreement with the current knowledge of bTB in New Zealand, transmission of M. bovis between cattle and wildlife was evident. Without direction, these estimates are less informative but taken in conjunction with the low prevalence of bTB in New Zealand’s cattle population it is likely that, currently, wildlife populations are acting as the main bTB reservoir. Wildlife should therefore continue to be targeted if bTB is to be eradicated from New Zealand. WGS will be a considerable aid to bTB eradication by greatly improving the discriminatory power of molecular typing data. The substitution rates estimated here will be an important part of epidemiological investigations using WGS data. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3569-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Joseph Crispell
- Institute of Biodiversity, Animal Health, and Comparative Medicine, University of Glasgow, Glasgow, Scotland, G61 1QH, UK
| | - Ruth N Zadoks
- Institute of Biodiversity, Animal Health, and Comparative Medicine, University of Glasgow, Glasgow, Scotland, G61 1QH, UK
| | - Simon R Harris
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Brent Paterson
- TBfree New Zealand, PO Box 3412, Wellington, 6140, New Zealand
| | | | | | | | - Mark A Neill
- TBfree New Zealand, PO Box 3412, Wellington, 6140, New Zealand
| | - Roman Biek
- Institute of Biodiversity, Animal Health, and Comparative Medicine, University of Glasgow, Glasgow, Scotland, G61 1QH, UK
| | - Samantha J Lycett
- Infection and Immunity Division, The Roslin Institute, University of Edinburgh, Easter Bush, Midlothian, Scotland, UK
| | - Rowland R Kao
- Institute of Biodiversity, Animal Health, and Comparative Medicine, University of Glasgow, Glasgow, Scotland, G61 1QH, UK.
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Witkowski L, Orłowska B, Rzewuska M, Czopowicz M, Welz M, Anusz K, Kita J. Evidence of low prevalence of mycobacterial lymphadenitis in wild boars (Sus scrofa) in Poland. Acta Vet Scand 2017; 59:9. [PMID: 28122588 PMCID: PMC5264462 DOI: 10.1186/s13028-017-0277-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 01/13/2017] [Indexed: 11/10/2022] Open
Abstract
Mycobacterium spp. and Rhodococcus equi are generally regarded as the main causes of lymphadenitis in pigs and wild boars. In Poland, mycobacterial submandibular lymphadenitis was first diagnosed in a wild boar in 2012 but Mycobacterium spp. infections are also present in the Polish population of European bison (Bison bonasus). The prevalence of lymphadenitis in Polish wild boars has been found to 8.4% (95% CI 6.2–11.3%) and it has been proved that R. equi is not an important cause of purulent lesions in these animals. The current study was carried out to assess the prevalence of mycobacterial lymphadenitis in the Polish wild boar population. Submandibular lymph nodes with purulent lesions collected from 38 wild boars in 2010/2011 and negative for R. equi were included. Calculations based on the hypergeometric approximation were used to determine the probability that at least one positive individual would be detected if the infection had been present at a prevalence greater than or equal to the design prevalence. All 38 samples were negative for Mycobacterium spp. [0% (95% CI 0, 9.2%)]. Epidemiological analysis showed that the true prevalence was 95% likely to be lower than 10%. In conclusion, mycobacterial lymphadenitis seems to occur rarely in wild boars in Poland. Due to the presence of Mycobacterium spp. infections in other wildlife, the surveillance of mycobacterial infections in wild animals in Poland remains an important issue.
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Nugent G, Yockney IJ, Whitford EJ, Cross ML, Aldwell FE, Buddle BM. Field Trial of an Aerially-Distributed Tuberculosis Vaccine in a Low-Density Wildlife Population of Brushtail Possums (Trichosurus vulpecula). PLoS One 2016; 11:e0167144. [PMID: 27893793 PMCID: PMC5125682 DOI: 10.1371/journal.pone.0167144] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 11/09/2016] [Indexed: 11/19/2022] Open
Abstract
Oral-delivery Mycobacterium bovis bacillus Calmette-Guérin (BCG) vaccine in a lipid matrix has been shown to confer protection against M. bovis infection and reduce the severity of tuberculosis (TB) when fed to brushtail possums (Trichosurus vulpecula), the major wildlife vector of bovine TB in New Zealand. Here we demonstrate the feasibility of aerial delivery of this live vaccine in bait form to an M. bovis-infected wild possum population, and subsequently assess vaccine uptake and field efficacy. Pre-trial studies indicated a resident possum population at very low density (<0.6 possums/ha) at the field site, with a 5.1% prevalence of macroscopic TB lesions. Pilot studies indicated that flavoured lipid matrix baits in weather-proof sachets could be successfully sown aerially via helicopter and were palatable to, and likely to be consumed by, a majority of wild possums under free-choice conditions. Subsequently, sachet-held lipid baits containing live BCG vaccine were sown at 3 baits/ha over a 1360 ha area, equating to >5 baits available per possum. Blood sampling conducted two months later provided some evidence of vaccine uptake. A necropsy survey conducted one year later identified a lower prevalence of culture-confirmed M. bovis infection and/or gross TB lesions among adult possums in vaccinated areas (1.1% prevalence; 95% CI, 0–3.3%, n = 92) than in unvaccinated areas (5.6%; 0.7–10.5%, n = 89); P = 0.098. Although not statistically different, the 81% efficacy in protecting possums against natural infection calculated from these data is within the range of previous estimates of vaccine efficacy in trials where BCG vaccine was delivered manually. We conclude that, with further straightforward refinement to improve free-choice uptake, aerial delivery of oral BCG vaccine is likely to be effective in controlling TB in wild possums. We briefly discuss contexts in which this could potentially become an important complementary tool in achieving national eradication of TB from New Zealand wildlife.
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Affiliation(s)
- Graham Nugent
- Landcare Research – Manaaki Whenua, Lincoln, New Zealand
- * E-mail:
| | | | | | | | - Frank E. Aldwell
- Centre for Innovation, University of Otago, Dunedin, New Zealand
| | - Bryce M. Buddle
- AgResearch, Hopkirk Institute, Palmerston North, New Zealand
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Díez-Delgado I, Rodríguez O, Boadella M, Garrido J, Sevilla IA, Bezos J, Juste R, Domínguez L, Gortázar C. Parenteral Vaccination with Heat-Inactivated Mycobacterium Bovis
Reduces the Prevalence of Tuberculosis-Compatible Lesions in Farmed Wild Boar. Transbound Emerg Dis 2016; 64:e18-e21. [DOI: 10.1111/tbed.12526] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Indexed: 11/28/2022]
Affiliation(s)
- I. Díez-Delgado
- SaBio-IREC (CSIC-UCLM-JCCM); Ciudad Real Spain
- Departamento de Sanidad Animal; Facultad de Veterinaria; Universidad Complutense de Madrid; Madrid Spain
| | - O. Rodríguez
- SABIOtec Spin-Off; Edificio Polivalente UCLM; Ciudad Real Spain
| | - M. Boadella
- SABIOtec Spin-Off; Edificio Polivalente UCLM; Ciudad Real Spain
| | - J.M. Garrido
- Departamento de Sanidad Animal; Instituto Vasco de Investigación y Desarrollo Agrario (NEIKER); Vizcaya Spain
| | - I. A. Sevilla
- Departamento de Sanidad Animal; Instituto Vasco de Investigación y Desarrollo Agrario (NEIKER); Vizcaya Spain
| | - J. Bezos
- Centro de Vigilancia Sanitaria Veterinaria (VISAVET); Universidad Complutense de Madrid; Madrid Spain
| | - R. Juste
- Departamento de Sanidad Animal; Instituto Vasco de Investigación y Desarrollo Agrario (NEIKER); Vizcaya Spain
| | - L. Domínguez
- Centro de Vigilancia Sanitaria Veterinaria (VISAVET); Universidad Complutense de Madrid; Madrid Spain
| | - C. Gortázar
- SaBio-IREC (CSIC-UCLM-JCCM); Ciudad Real Spain
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El Mrini M, Kichou F, Kadiri A, Berrada J, Bouslikhane M, Cordonnier N, Romero B, Gortázar C. Animal tuberculosis due to Mycobacterium bovis in Eurasian wild boar from Morocco. EUR J WILDLIFE RES 2016. [DOI: 10.1007/s10344-016-1022-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Emerging Tuberculosis Pathogen Hijacks Social Communication Behavior in the Group-Living Banded Mongoose (Mungos mungo). mBio 2016; 7:mBio.00281-16. [PMID: 27165798 PMCID: PMC4895101 DOI: 10.1128/mbio.00281-16] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
An emerging Mycobacterium tuberculosis complex (MTC) pathogen, M. mungi, infects wild banded mongooses (Mungos mungo) in Northern Botswana, causing significant mortality. This MTC pathogen did not appear to be transmitted through a primary aerosol or oral route. We utilized histopathology, spoligotyping, mycobacterial interspersed repetitive units-variable number of tandem repeats (MIRU-VNTR), quantitative PCR (qPCR), and molecular markers (regions of difference [RDs] from various MTC members, including region of difference 1 [RD1] from M. bovis BCG [RD1BCG], M. microti [RD1mic], and M. pinnipedii [RD1seal], genes Rv1510 [RD4], Rv1970 [RD7], Rv3877/8 [RD1], and Rv3120 [RD12], insertion element IS1561, the 16S RNA gene, and gene Rv0577 [cfp32]), including the newly characterized mongoose-specific deletion in RD1 (RD1mon), in order to demonstrate the presence of M. mungi DNA in infected mongooses and investigate pathogen invasion and exposure mechanisms. M. mungi DNA was identified in 29% of nasal planum samples (n = 52), 56% of nasal rinses and swabs (n = 9), 53% of oral swabs (n = 19), 22% of urine samples (n = 23), 33% of anal gland tissue (n = 18), and 39% of anal gland secretions (n = 44). The occurrence of extremely low cycle threshold values obtained with qPCR in anal gland and nasal planum samples indicates that high levels of M. mungi can be found in these tissue types. Histological data were consistent with these results, suggesting that pathogen invasion occurs through breaks in the nasal planum and/or skin of the mongoose host, which are in frequent contact with anal gland secretions and urine during olfactory communication behavior. Lesions in the lung, when present, occurred only with disseminated disease. No environmental sources of M. mungi DNA could be found. We report primary environmental transmission of an MTC pathogen that occurs in association with social communication behavior. Organisms causing infectious disease evolve modes of transmission that exploit environmental and host conditions favoring pathogen spread and persistence. We report a novel mode of environmental infectious disease transmission that occurs in association with olfactory secretions (e.g., urine and anal gland secretions), allowing pathogen exposure to occur within and between social groups through intricate social communication behaviors of the banded mongoose host. The presence of M. mungi in these environmentally deposited secretions would effectively circumvent natural social barriers (e.g., territoriality), facilitating between-group pathogen transmission in the absence of direct physical contact, a rare occurrence in this highly territorial species. This work identifies an important potential mechanism of pathogen transmission of epidemiological significance in social species. We also provide evidence of a novel mechanism of pathogen transmission for the MTC complex, where pathogen movement in the environment and host exposure dynamics are driven by social behavior.
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A modelling framework for predicting the optimal balance between control and surveillance effort in the local eradication of tuberculosis in New Zealand wildlife. Prev Vet Med 2016; 125:10-8. [DOI: 10.1016/j.prevetmed.2016.01.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 12/01/2015] [Accepted: 01/04/2016] [Indexed: 11/19/2022]
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Livingstone PG, Hancox N, Nugent G, Mackereth G, Hutchings SA. Development of the New Zealand strategy for local eradication of tuberculosis from wildlife and livestock. N Z Vet J 2015; 63 Suppl 1:98-107. [PMID: 25651829 PMCID: PMC4566894 DOI: 10.1080/00480169.2015.1013581] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We describe the progressive development of New Zealand's national strategy for control of tuberculosis (TB) in its agricultural sector over the last four decades. The strategy is globally unique, reflecting the need for effective and co-ordinated management of TB in a wildlife maintenance host, the brushtail possum (Trichosurus vulpecula), in addition to controlling infection in cattle and farmed deer herds. Since the early 1990s, the strategy has been developed by the Animal Health Board (AHB), formed to empower the farming industry to take the leadership role in funding of TB control, policy development and administration. The AHB became the first non-government organisation to develop and gain acceptance by the funders (farming industry and government) of a National Pest Management Strategy (NPMS) under the Biosecurity Act 1993. A key outcome of the NPMS for TB control was the development and inclusion of very challenging objectives that provided direction for management, research and possum control. This paper describes the process whereby the NPMS was revised twice, following achievement of each successive set of strategy objectives within budget. Success was based on firstly, reorganisation of the AHB and its operational systems to achieve increased efficiency; secondly, improved efficiency through contracting possum and disease control, and thirdly research delivering effective and practical applications, while also providing a scientific basis for setting directions for future control strategies. The last revision of the NPMS was implemented in 2011, and included objectives to eradicate Mycobacterium bovis-infected wildlife populations over 2.5 million hectares by 2026. This ambitious objective was adopted only after extensive forecast modelling enabled stakeholders to identify and select the most cost-effective long-term solution for the management of M. bovis-infected possum populations. The accomplishment of New Zealand's TB control programme, in meeting successive sets of demanding NPMS objectives, has seen a 95% decrease in the number of infected cattle and deer herds since they peaked at 1,694 in 1994, and the eradication of TB from infected possum populations from 830,000 hectares. Provided the current level of funding continues, New Zealand is positioned to achieve national eradication of TB well in advance of the 40–50-year timeline forecast 3 years ago.
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Affiliation(s)
- P G Livingstone
- a TBfree New Zealand , PO Box 3412, Wellington 6140 , New Zealand
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Barron MC, Tompkins DM, Ramsey DSL, Bosson MAJ. The role of multiple wildlife hosts in the persistence and spread of bovine tuberculosis in New Zealand. N Z Vet J 2015; 63 Suppl 1:68-76. [PMID: 25384267 PMCID: PMC4566902 DOI: 10.1080/00480169.2014.968229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
AIM To explore how the inclusion of multi-host dynamics affects the predicted prevalence of bovine tuberculosis (TB) in possums and other host species following the current best practice for control of TB in large difficult and remote areas, to identify which host species are responsible for changes in predicted prevalence, and whether TB can persist in possum-free host communities. METHODS Multi-host TB models were constructed, comprising three host species with density-dependent population growth, density-dependent disease transmission and susceptible and infected classes. Models were parameterised for two case studies of current concern in New Zealand, namely chronic TB persistence in a possum-deer-pig complex in extensive forest, and in a possum-pig-ferret complex in unforested semi-arid shrub and grasslands. Persistence of TB in the face of best practice possum control was evaluated from model simulations, and the contribution of different hosts to persistence of TB was assessed by removing each host species in turn from the simulations. A sensitivity test explored how different parameter values affected modelled persistence of TB. RESULTS The forest multi-host model-predicted amplification of TB prevalence due to the presence of pigs. The presence of pigs and/or deer did not jeopardise the success of best practice possum control in eradicating TB from the system, as pigs and deer are effectively end-hosts for TB. Sensitivity analyses indicated these interpretations were robust to uncertainty in model parameter values. The grassland system model predicted that the multi-host species complex could potentially lead to failure of eradication of TB under possum-only control, due to TB persisting in ferret and pig populations in the absence of possum hosts through reciprocal scavenging, resulting in spillback transmission to possums once their populations had started to recover from control. CONCLUSIONS With respect to management of TB, for modelled forest habitats, 15 years of effective possum control was predicted to eradicate TB from the possum-deer-pig host community, indicating the current focus on possum-only control is appropriate for such areas. For grassland model systems, TB was predicted to persist in the ferret-pig host complex in the absence of possums, potentially jeopardising the effectiveness of possum-only control programmes. However this outcome depended on the occurrence and rate of pigs acquiring TB from ferrets, which is unknown. Thus some estimation of this transmission parameter is required to enable managers to assess if multi-host disease dynamics are important for their TB control programmes.
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Affiliation(s)
- M C Barron
- a Wildlife Ecology and Management , Landcare Research , PO Box 69040, Lincoln 7640 , New Zealand
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Anderson DP, Ramsey DSL, de Lisle GW, Bosson M, Cross ML, Nugent G. Development of integrated surveillance systems for the management of tuberculosis in New Zealand wildlife. N Z Vet J 2015; 63 Suppl 1:89-97. [PMID: 25263814 PMCID: PMC4566888 DOI: 10.1080/00480169.2014.963830] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Disease surveillance for the management of bovine tuberculosis (TB) in New Zealand has focussed, to a large extent, on the development of tools specific for monitoring Mycobacterium bovis infection in wildlife. Diagnostic techniques have been modified progressively over 30 years of surveillance of TB in wildlife, from initial characterisation of gross TB lesions in a variety of wildlife, through development of sensitive culture techniques to identify viable mycobacteria, to molecular identification of individual M. bovis strains. Of key importance in disease surveillance has been the elucidation of the roles that different wildlife species play in the transmission of infection, specifically defining brushtail possums (Trichosurus vulpecula) as true maintenance hosts compared to those that are predominantly spillover hosts, but which may serve as useful sentinel species to indicate TB persistence. Epidemiological modelling has played a major role in TB surveillance, initially providing the theoretical support for large-scale possum population control and setting targets at which control effort should be deployed to ensure disease eradication. As TB prevalence in livestock and wildlife declined throughout the 2000s, more varied field tools were developed to gather surveillance data from the diminishing possum populations, and to provide information on changing TB prevalence. Accordingly, ever more precise (but disparate) surveillance information began to be integrated into multi-faceted decision-assist models to support TB management decisions, particularly to provide informed parameters at which control effort could be halted, culminating in the Proof of Freedom modelling framework that now allows an area to be declared TB-free within chosen confidence limits. As New Zealand moves from large-scale TB control to regional eradication of disease in the coming years, further integrative models will need to be developed to support management decisions, based on combined field data of possum and TB prevalence, sentinel information, risk assessment in relation to financial benefits, and changing political and environmental needs.
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Affiliation(s)
- D P Anderson
- a Landcare Research , Wildlife Ecology and Management , PO Box 69040, Lincoln 7640 , New Zealand
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Byrom AE, Caley P, Paterson BM, Nugent G. Feral ferrets (Mustela furo) as hosts and sentinels of tuberculosis in New Zealand. N Z Vet J 2015; 63 Suppl 1:42-53. [PMID: 25495945 PMCID: PMC4699325 DOI: 10.1080/00480169.2014.981314] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
The control and eventual eradication of bovine tuberculosis (TB) poses major challenges in New Zealand, given the variety of wildlife species susceptible to TB, many of which are capable of onwards transmission of Mycobacterium bovis infection. Here we discuss the role of feral ferrets (Mustela furo), focussing on potential transmission or risk pathways that have implications for management of TB. Firstly inter-specific transmission to ferrets. Ferrets scavenge potentially infected wildlife, including other ferrets, thus prevalence of TB can be amplified through ferrets feeding on tuberculous carcasses, particularly brushtail possums (Trichosurus vulpecula). Secondly intra-specific transmission between ferrets. The rate of ferret-ferret transmission depends on population density, and in some places ferret densities exceed the estimated threshold for disease persistence. TB can therefore potentially be maintained independently of other sources of infection. Thirdly transmission from ferrets to other wildlife. These include the main wildlife maintenance host, brushtail possums, that will occasionally scavenge potentially tuberculous ferret carcasses. Fourthly transmission from ferrets to livestock. This is considered to occur occasionally, but the actual rate of transmission has never been measured. Fifthly geographical spread. M. bovis-infected ferrets can travel large distances and cause new outbreaks of TB at locations previously free of TB, which may have caused an expansion of TB-endemic areas.Ferrets play a complex role in the TB cycle in New Zealand; they are capable of contracting, amplifying and transmitting M. bovis infection, sometimes resulting in ferret populations with a high prevalence of TB. However, ferret population densities are usually too low to sustain infection independently, and transmission to other wildlife or livestock appears a rarer event than with possums. Nevertheless, management of ferrets remains a key part of the National Pest Management Strategy for TB. Control is prudent where M. bovis-infected ferret populations exist in high numbers, to reduce the onward transmission risk of any self-sustained infection to livestock. When ferret numbers are well below the theoretical disease maintenance threshold, ferret control is still sometimes warranted because of the animals’ ability to acquire infection when young and, through dispersal, transport it outside TB-endemic areas. Ferrets can also be used as disease sentinels for TB, especially in areas where alternative sentinel species are rare or expensive to survey, and when sampling of possums is not cost-effective.
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Affiliation(s)
- A E Byrom
- a Wildlife Ecology and Management Team , Landcare Research , Lincoln , New Zealand
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Abstract
Tuberculosis (TB) due to Mycobacterium bovis infection was first identified in brushtail possums (Trichosurus vulpecula) in New Zealand in the late 1960s. Since the early 1970s, possums in New Zealand have been controlled as part of an ongoing strategy to manage the disease in livestock. The TB management authority (TBfree New Zealand) currently implements three strategic choices for disease-related possum control: firstly TB eradication in areas selected for eradication of the disease from livestock and wildlife, secondly Free Area Protection in areas in which possums are maintained at low densities, normally along a Vector Risk Area (VRA) boundary, and thirdly Infected Herd Suppression, which includes the remaining parts of VRA where possums are targeted to minimise the infection risk to livestock. Management is primarily through a range of lethal control options. The frequency and intensity of control is driven by a requirement to reduce populations to very low levels (usually to a trap-catch index below 2%), then to hold them at or below this level for 5–10 years to ensure disease eradication.Lethal possum control is implemented using aerial- and ground-based applications, under various regulatory and operational constraints. Extensive research has been undertaken aimed at improving the efficacy and efficiency of control. Aerial applications use sodium fluoroacetate (1080) bait for controlling possums over extensive and rugged areas of forest that are difficult to access by foot. Ground-based control uses a range of toxins (primarily, a potassium cyanide-based product) and traps. In the last 5 years there has been a shift from simple possum population control to the collection of spatial data on possum presence/absence and relative density, using simple possum detection devices using global positioning system-supported data collection tools, with recovery of possum carcasses for diagnostic necropsy. Such data provide information subsequently used in predictive epidemiological models to generate a probability of TB freedom.The strategies for managing TB in New Zealand wildlife now operate on four major principles: firstly a target threshold for possum population reduction is defined and set, secondly an objective methodology is applied for assessing whether target reductions have been achieved, thirdly effective control tools for achieving possum population reductions are used, and fourthly the necessary legislative support is in place to ensure compliance. TBfree New Zealand's possum control programme meets these requirements, providing an excellent example of an effective pest and disease control programme.
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Affiliation(s)
- B Warburton
- a Landcare Research , PO Box 69040, Lincoln , New Zealand
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Assessing the Effectiveness of Tuberculosis Management in Brushtail Possums (Trichosurus vulpecula), through Indirect Surveillance of Mycobacterium bovis Infection Using Released Sentinel Pigs. Vet Med Int 2014; 2014:361634. [PMID: 24804148 PMCID: PMC3996883 DOI: 10.1155/2014/361634] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 02/23/2014] [Indexed: 11/17/2022] Open
Abstract
In New Zealand, wild pigs acquire Mycobacterium bovis infection by scavenging tuberculous carrion, primarily carcasses of the main disease maintenance host, the brushtail possum (Trichosurus vulpecula). We investigated the utility of captive-reared, purpose-released pigs as sentinels for tuberculosis (TB) following lethal possum control and subsequent population recovery. Within 2-3 years of possum control by intensive poisoning, TB prevalence and the incidence rate of M. bovis infection in released sentinel pigs were lower than in an adjacent area where possums had not been poisoned. Unexpectedly, TB did not decline to near zero levels among pigs in the poisoned area, a fact which reflected an unanticipated rapid increase in the apparent abundance of possums. Monitoring infection levels among resident wild pigs confirmed that TB prevalence, while reduced due to possum control, persisted in the poisoned area at >20% among pigs born 2-3 years after poisoning, while remaining >60% among resident wild pigs in the nonpoisoned area. When fitted with radio-tracking devices, purpose-released pigs provided precise spatial TB surveillance information and facilitated effective killing of wild pigs when employed as “Judas” animals to help locate residents. Sentinel pigs offer value for monitoring disease trends in New Zealand, as TB levels in possums decline nationally due to large-scale possum control.
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