1
|
Fernández M, Royo M, Fuertes M, Arteche-Villasol N, Ferreras MC, Benavides J, Pérez V. Effects of Paratuberculosis Vaccination at Different Ages in a Dairy Goat Herd: A 2-Year Follow-Up. Animals (Basel) 2022; 12:ani12223135. [PMID: 36428363 PMCID: PMC9686706 DOI: 10.3390/ani12223135] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022] Open
Abstract
Vaccination could be considered as an effective method for paratuberculosis control, although controversial, with a need for investigation in some aspects. The objective of this study was to evaluate the effect of vaccination, depending on the age of the animals, on their immune response, the reduction of paratuberculosis cases, mortality and culled animals in a commercial dairy herd. Goats from three different ages were immunized with the inactivated Gudair® vaccine. Peripheral antibody and IFN-γ output were evaluated for 21 months post-vaccination (mpv) and intradermal skin tests (IDSTs) for tuberculosis, with avian- and bovine-purified protein derivatives (PPD), were carried out at 6 and at 18 mpv to evaluate the humoral and cellular immune peripheral responses, respectively. The number of dead or culled animals, regardless of the reason, was also monitored and the causes of death determined by pathological examination. A significant increase in the production of IFN-γ was observed in all the vaccinated groups when the blood samples were stimulated with avian PPD, from 3 mpv to 18 mpv, and with bovine PPD, between 3 and 21 mpv. Moreover, serum antibody levels increased between 3 and 21 mpv in all vaccinated groups. The highest levels were found in animals vaccinated at 5 months, and the lowest in adult individuals. No positive reactants to tuberculosis were found by intradermal skin test. No animal losses associated with clinical paratuberculosis were detected in any of the groups. The number of total culled animals was significantly lower in the vaccinated than in the unvaccinated groups, especially on 1.5-month-old vaccinated kids. These results suggest that vaccination of paratuberculosis, especially in young animals, could induce heterologous protection.
Collapse
Affiliation(s)
- Miguel Fernández
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
- Correspondence:
| | - Marcos Royo
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| | - Miguel Fuertes
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| | - Noive Arteche-Villasol
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| | - M. Carmen Ferreras
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| | - Julio Benavides
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| | - Valentín Pérez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24007 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), 24346 Grulleros, Spain
| |
Collapse
|
2
|
Fernández M, Royo M, Arteche-Villasol N, Ferreras MC, Benavides J, Pérez V. Peripheral IFN-ɣ Production after Blood Stimulation with Different Mycobacterial Antigens in Goats Vaccinated against Paratuberculosis. Vaccines (Basel) 2022; 10:vaccines10101709. [PMID: 36298574 PMCID: PMC9611356 DOI: 10.3390/vaccines10101709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/03/2022] [Accepted: 10/11/2022] [Indexed: 11/16/2022] Open
Abstract
Vaccination can be an efficient method for the control of paratuberculosis in ruminants. However, the official tuberculosis control tests cross-interfere with the animals vaccinated against paratuberculosis. In order to test and compare new antigens that could solve this problem, the production of interferon-gamma (IFN-γ) in peripheral blood at different post-vaccination days in experimental kids and adult goats, in field conditions, using the avian and bovine purified protein derivative (PPD), the johnin, two peptide cocktails of Mycobacterium bovis (PC-EC and PC-HP) and the antigens VK 055 and VK 067 of Mycobacterium avium subspecies paratuberculosis (Map) has been analyzed in vitro. The non-specific production of IFN-γ was observed after blood stimulation with the PC-EC and PC-HP cocktail in any sample from vaccinated animals, whereas it was detected when bovine PPD was used. These results support the possible use of these new Mycobacterium bovis antigens in the in the differentiation of animals vaccinated against paratuberculosis or infected with tuberculosis by improving the specificity of bovine PPD. In contrast, the two Map antigens tested in this study did not improve the sensitivity of johnin or avian PPD in the detection of vaccinated or Map-infected goats.
Collapse
Affiliation(s)
- Miguel Fernández
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24071 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
- Correspondence: ; Tel.: +34-987-291-232
| | - Marcos Royo
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24071 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
| | - Noive Arteche-Villasol
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24071 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
| | - M. Carmen Ferreras
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24071 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
| | - Julio Benavides
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
| | - Valentín Pérez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Campus de Vegazana, Universidad de León, 24071 León, Spain
- Departamento de Sanidad Animal, Instituto de Ganadería de Montaña (CSIC-ULE), Finca Marzanas, 24346 Grulleros, León, Spain
| |
Collapse
|
3
|
Ortega J, Roy Á, Álvarez J, Sánchez-Cesteros J, Romero B, Infantes-Lorenzo JA, Sáez JL, López M, Domínguez L, de Juan L, Bezos J. Effect of the Inoculation Site of Bovine and Avian Purified Protein Derivatives (PPDs) on the Performance of the Intradermal Tuberculin Test in Goats From Tuberculosis-Free and Infected Herds. Front Vet Sci 2021; 8:722825. [PMID: 34513976 PMCID: PMC8429842 DOI: 10.3389/fvets.2021.722825] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 07/27/2021] [Indexed: 11/18/2022] Open
Abstract
The single and comparative intradermal tuberculin (SIT and CIT) tests are used for the ante-mortem diagnosis of caprine tuberculosis (TB). The tuberculin injection site has been associated with a different performance of the test in cattle. In contrast to that required in cattle in Europe (cervical injection), it can be carried out in the scapular region in goats. Nevertheless, there are no previous data concerning the effect of the injection site on the performance of the test in goats. The aim of the present study was to evaluate the effect of two different inoculation sites (cervical and scapular) on the performance of the SIT/CIT tests. This was done by intradermally inoculating 309 goats from two infected herds and one TB-free herd with both avian and bovine PPDs in the mid-cervical and scapular regions. None of the animals from the TB-free herd had positive reactions, and the number of reactors was not significantly higher, regardless of the inoculation site, in the high and low prevalence herds. However, significantly higher increases in skin fold thickness were observed on the cervical site when compared to the scapular site after the avian and bovine PPD inoculations in the TB-free herd (p < 0.001) and after the bovine PPD injection in the high prevalence herd (p = 0.003). The presence of clinical signs was also more evident on the cervical site when using avian and bovine PPDs in the high prevalence herd (p < 0.01). In contrast, increases in higher skin fold thickness were observed on the scapular site when compared to the cervical site after the bovine and avian PPD inoculations were employed in the low prevalence herd (p < 0.01). These results suggest that the cervical injection of PPDs may improve the sensitivity of the intradermal tuberculin test in high TB prevalence caprine herds, mainly owing to the increased presence of local clinical signs and a better performance of the CIT test. Moreover, specificity was not affected when using standard interpretations, although further analyses in a great number of herds are required in order to confirm these findings.
Collapse
Affiliation(s)
- Javier Ortega
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Álvaro Roy
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Julio Álvarez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | | | - Beatriz Romero
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Jose A Infantes-Lorenzo
- Servicio de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Majadahonda, Spain
| | - José L Sáez
- Ministerio de Agricultura, Pesca y Alimentación, Madrid, Spain
| | - Marisol López
- Servicio Territorial de Agricultura, Ganadería y Desarrollo Rural de Ávila- Sección de Sanidad y Producción Animal, Ávila, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Lucia de Juan
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| |
Collapse
|
4
|
Ortega J, Infantes-Lorenzo JA, Bezos J, Roy Á, de Juan L, Romero B, Moreno I, Gómez-Buendía A, Agulló-Ros I, Domínguez L, Domínguez M. Evaluation of P22 ELISA for the Detection of Mycobacterium bovis-Specific Antibody in the Oral Fluid of Goats. Front Vet Sci 2021; 8:674636. [PMID: 34458351 PMCID: PMC8385241 DOI: 10.3389/fvets.2021.674636] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 07/20/2021] [Indexed: 11/13/2022] Open
Abstract
The ante-mortem diagnosis of tuberculosis (TB) in ruminants is based mainly on the intradermal tuberculin test and the IFN-γ assay. Antibody (Ab)-based tests have emerged as potential tools for the detection of TB infected animals using serum, plasma, or even milk samples. Oral fluids have also been evaluated as alternative samples with which to detect specific Abs against Mycobacterium bovis in pigs or wild boars, but not in ruminants. The objective of this study was, therefore, to evaluate the performance of an in house-ELISA for TB diagnosis (P22 ELISA) in goats as an experimental model for the diagnosis of TB using oral fluid samples. Oral fluid samples from 64 goats from a TB-infected herd (n = 197) and all the animals from a TB-free herd (n = 113) were analyzed using the P22 ELISA. The estimated sensitivity (Se) and specificity (Sp) were 34.4% (95% CI: 22.4–45.6) and 100% (95% CI: 97.4–100), respectively. The optimal cut-off point was set at 100% according to the ROC analysis. Those animals with a higher level of Abs in their oral fluid attained a higher lesion score (p = 0.018). In fact, when taking into account only the setting of the animals with severe lesions (n = 16), the ELISA showed a Se of 75% (95% CI: 53.7–96.2). Results of the present study suggest that the P22 ELISA is highly specific but has a limited value detecting infected animals in oral fluid samples. Nevertheless, its performance is significantly higher in the presence of severe lesions.
Collapse
Affiliation(s)
- Javier Ortega
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - José A Infantes-Lorenzo
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Álvaro Roy
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Lucia de Juan
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Beatriz Romero
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - Inmaculada Moreno
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| | | | - Irene Agulló-Ros
- Grupo de Investigación en Sanidad Animal y Zoonosis, Departamento de Anatomía y Anatomía Patológica Comparadas, Facultad de Veterinaria, Universidad de Córdoba, Córdoba, Spain
| | - Lucas Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Mercedes Domínguez
- Unidad de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| |
Collapse
|
5
|
Espinosa J, Fernández M, Royo M, Grau A, Ángel Collazos J, Benavides J, Del Carmen Ferreras M, Mínguez O, Pérez V. Influence of vaccination against paratuberculosis on the diagnosis of caprine tuberculosis during official eradication programmes in Castilla y León (Spain). Transbound Emerg Dis 2020; 68:692-703. [PMID: 32668068 DOI: 10.1111/tbed.13732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/24/2020] [Accepted: 07/09/2020] [Indexed: 12/18/2022]
Abstract
The information generated from the official eradication programmes of caprine tuberculosis (TB) in Castilla y León, Spain, during 2018, has been used to assess the effect of vaccination against paratuberculosis (PTB) and the presence of this infection, on the single intradermal tuberculin (SIT) test results. Data from 121,665 goats belonging to 1936 different herds were analysed using generalized linear models. An epidemiological survey was conducted to know the herd immunization status against PTB and the date of last vaccination. All SIT test-positive animals were further investigated in order to confirm the diagnosis of TB, through bacterial culture, and PTB, by histopathological and qPCR analyses. SIT positivity was found in 39 (2.01%) herds and 507 (0.41%) goats. TB was confirmed by M. caprae or M. bovis isolation in 10 (0.51%) herds and 46 (0.038%) goats. PTB was diagnosed in 13 (33.33%) and 55 (10.84%) of the SIT test-positive herds and goats, respectively. Vaccination against PTB showed a significant influence on the results of the SIT test at herd level, with higher positivity detected among those herds vaccinated. However, this effect was not observed when the total number of animals was considered, where the highest positivity was found in unvaccinated goats. The time elapsed between vaccination and SIT test performance also influenced the results. The strongest effect was found when less than eight months elapsed between performing both activities, and to a lesser extent between 8 and 12 months. Conversely, no positive herds or animals were found when the time elapsed was higher than one year. No significant effect of the presence of PTB was observed. These findings demonstrate that the use of PTB vaccine does not result in false positives to a SIT test at individual level, provided that the time elapsed between the performance of both practices is higher than 12 months.
Collapse
Affiliation(s)
- José Espinosa
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| | - Miguel Fernández
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| | - Marcos Royo
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| | - Anna Grau
- Servicio de Sanidad Animal, Junta de Castilla y León, Valladolid, Spain
| | | | - Julio Benavides
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| | - María Del Carmen Ferreras
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| | - Olga Mínguez
- Servicio de Sanidad Animal, Junta de Castilla y León, Valladolid, Spain
| | - Valentín Pérez
- Departamento de Sanidad Animal, Facultad de Veterinaria, Instituto de Ganadería de Montaña (CSIC-ULE), Universidad de León, León, Spain
| |
Collapse
|
6
|
Roy A, Infantes-Lorenzo JA, de la Cruz ML, Domínguez L, Álvarez J, Bezos J. Accuracy of tuberculosis diagnostic tests in small ruminants: A systematic review and meta-analysis. Prev Vet Med 2020; 182:105102. [PMID: 32739695 DOI: 10.1016/j.prevetmed.2020.105102] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/26/2020] [Accepted: 07/23/2020] [Indexed: 01/08/2023]
Abstract
Tuberculosis (TB) in small ruminants is a neglected disease despite its major impact on goat and sheep production and the global public health. The awareness of the role of small ruminants in the epidemiology of animal TB has increased in the last two decades, however, there is a lack of standardization of procedures and robust quantitative estimates on the accuracy of diagnostic TB tests in the scientific literature. To address this knowledge gap, all the available information regarding the use of ante-mortem diagnostic techniques in small ruminants was collected and summarized through a systematic review process. Furthermore, a random-effects meta-analysis was conducted to separately estimate the sensitivity (Se) and specificity (Sp) of cell-based tests among the retrieved studies in goats. Studies included in the meta-analysis were also evaluated using the Quality Assessment of Diagnostic Accuracy Studies included in systematic reviews adapted for animal diagnostic tests (VETQUADAS). Median pooled Se estimates of the single intradermal tuberculin (SIT) test (ranged from 0.51 to 0.59), the comparative intradermal tuberculin (CIT) test (ranged from 0.30 to 0.50) and the interferon-gamma (IFN-γ) release assay (IGRA) (ranged from 0.66 to 0.72) were lower than that reported previously in cattle, regardless the interpretation criteria and the reporting of MAP infection or vaccination. However, the specificity was adequate for all the tests (ranged from 0.95 to 0.99), except for the SIT test in MAP vaccinated herds (ranged from 0.78 to 0.90). This study provides an overview of the accuracy of diagnostic tests for TB in goats, however, the considerable between-study heterogeneity found hampered the conclusive interpretation of the pooled Se and Sp estimates. Therefore, further studies in small ruminants are necessary to optimize the diagnostic Se, which could help to design effective control strategies, accelerate the eradication of TB in these species and harmonize test procedures.
Collapse
Affiliation(s)
- A Roy
- CZ Vaccines, Porriño, Pontevedra, Spain; VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain
| | - J A Infantes-Lorenzo
- Servicio de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Majadahonda, Madrid, Spain
| | - M L de la Cruz
- Faculty of Medicine, Universidad Francisco de Vitoria, UFV, Pozuelo de Alarcón, Madrid, Spain
| | - L Domínguez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Department of Animal Health. Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - J Álvarez
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Department of Animal Health. Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain
| | - J Bezos
- VISAVET Health Surveillance Centre, Complutense University of Madrid, Madrid, Spain; Department of Animal Health. Faculty of Veterinary Medicine, Complutense University of Madrid, Madrid, Spain.
| |
Collapse
|
7
|
Arrieta-Villegas C, Infantes-Lorenzo JA, Bezos J, Grasa M, Vidal E, Mercader I, Singh M, Domingo M, de Juan L, Pérez de Val B. Evaluation of P22 Antigenic Complex for the Immuno-Diagnosis of Tuberculosis in BCG Vaccinated and Unvaccinated Goats. Front Vet Sci 2020; 7:374. [PMID: 32714950 PMCID: PMC7351524 DOI: 10.3389/fvets.2020.00374] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/28/2020] [Indexed: 12/14/2022] Open
Abstract
Current eradication strategies of tuberculosis (TB) in goats mainly rely on the single intradermal tuberculin test (SIT) and single intradermal cervical comparative tuberculin tests (SICCTs). TB vaccination has been proposed as a cost-effective option in high-prevalence herds or countries where economic compensation for the slaughter of positive animals is not affordable. However, TB vaccination compromises the efficiency of tuberculin-based diagnostic tests. In this study, the performance of a new diagnostic platform, based on the P22 antigenic complex, was assessed for skin test (ST), interferon-gamma release assay (IGRA), and serology under different TB scenarios. The sensitivity (Se) of diagnostic tests was assessed in TB-infected goats from the same farm (herd A, N = 77). The specificity (Sp) was assessed in two TB-negative farms (both vaccinated against paratuberculosis): one TB unvaccinated (herd B, N = 77) and another vaccinated with bacille Calmette-Guérin (BCG) (herd C, N = 68). The single (s) P22-IGRA showed the highest Se among IGRA tests (91%), and the comparative (c) P22-ST showed the highest Sp (100% in herd B and 98% in herd C). Combined interpretation of techniques enabled the best diagnostic performances. Combining the SICCT + sP22-IGRA improved Se (97%) compared to SICCT + tuberculin-based IGRA (95%), with a reduction of Sp (95 and 100%, respectively). Besides, combination of P22-ELISA with cP22-ST or SICCT elicited a similar performance in the non-vaccination context (Se: 94 and 95%; Sp: 95 and 95%, respectively), but Sp was significantly higher for the combination with cP22-ST compared to SICCT in the TB vaccination context (95 and 79%, respectively). The combination of serological tests based on P22 and MPB83 showed higher complementarity and improved 13 percentage points the Se of P22-ELISA alone. These findings suggest that either cell-mediated or antibody-based diagnostic techniques, using the P22 antigen complex, can contribute to improve the immunodiagnostics of TB in goats under different TB control strategies.
Collapse
Affiliation(s)
- Claudia Arrieta-Villegas
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus Universitat Autònoma de Barcelona, Barcelona, Spain
| | - José Antonio Infantes-Lorenzo
- Servicio de Inmunología Microbiana, Centro Nacional de Microbiología, Instituto de Investigación Carlos III, Madrid, Spain
| | - Javier Bezos
- VISAVET Health Surveillance Center, Universidad Complutense de Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Miriam Grasa
- Agrupació de Defensa Sanitària de Cabrum i Oví Lleter de Catalunya, Barbens, Spain
| | - Enric Vidal
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Irene Mercader
- Departament d'Agricultura, Ramaderia, Pesca i Alimentació de la Generalitat de Catalunya, Barcelona, Spain
| | - Mahavir Singh
- Lionex Diagnostics and Therapeutics GmbH, Braunschweig, Germany
| | - Mariano Domingo
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus Universitat Autònoma de Barcelona, Barcelona, Spain.,Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
| | - Lucía de Juan
- VISAVET Health Surveillance Center, Universidad Complutense de Madrid, Madrid, Spain.,Departamento de Sanidad Animal, Universidad Complutense de Madrid, Madrid, Spain
| | - Bernat Pérez de Val
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus Universitat Autònoma de Barcelona, Barcelona, Spain
| |
Collapse
|
8
|
Evaluation of a new enzyme-linked immunosorbent assay for the diagnosis of tuberculosis in goat milk. Res Vet Sci 2019; 128:217-223. [PMID: 31835123 DOI: 10.1016/j.rvsc.2019.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 11/27/2019] [Accepted: 12/04/2019] [Indexed: 11/20/2022]
Abstract
Caprine tuberculosis (TB) is a zoonosis with sanitary and economic repercussions. Caprine TB control programs are based on a test and cull strategy using the intradermal tuberculin tests and slaughterhouse surveillance. However, this approach is not always feasible and may have a limited sensitivity under specific circumstances. In this study, performance of a new experimental test based on the P22 protein complex (P22 ELISA) was evaluated in two TB-infected herds using milk and serum samples and compared with cell-based diagnostic tests. Samples from a low (n = 62, herd 1) and a high (n = 52, herd 2) TB prevalence herd were selected. Moreover, bulk tank milk samples from both herds were analysed using the P22 ELISA. At the end of the study, a group of animals (n = 21) was euthanized and subjected to post-mortem analysis and bacteriological culture. Significant differences (p < .001) on the qualitative and quantitative (ODs) results were observed between herds using both serum and milk samples in the P22 ELISA. The correlation observed in the quantitative results obtained in serum and milk samples was very strong in animals from flock 2 (rs = 0.91) and moderate in animals from flock 1 (rs = 0.46). Among the slaughtered animals, the P22 ELISA detected a higher proportion of lesion-culture positive animals than cell-based diagnostic tests (61.9 and 66.7% using milk and serum samples, respectively). The P22 ELISA using milk samples demonstrated a similar sensitivity compared with serum samples, suggesting it might be a valuable test for TB control in dairy goats.
Collapse
|
9
|
Koets A, Ravesloot L, Ruuls R, Dinkla A, Eisenberg S, Lievaart-Peterson K. Effects of Age and Environment on Adaptive Immune Responses to Mycobacterium avium subsp. paratuberculosis (MAP) Vaccination in Dairy Goats in Relation to Paratuberculosis Control Strategies. Vet Sci 2019; 6:vetsci6030062. [PMID: 31266267 PMCID: PMC6789810 DOI: 10.3390/vetsci6030062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/19/2019] [Accepted: 06/28/2019] [Indexed: 11/16/2022] Open
Abstract
Paratuberculosis infection is caused by Mycobacterium avium subsp. paratuberculosis (MAP). In the Netherlands, 75% herd level prevalence of caprine paratuberculosis has been estimated, and vaccination is the principal control strategy applied. Most goat dairy farms with endemic paratuberculosis systematically vaccinate goat kids in the first months of life with a commercially available whole cell MAP vaccine. We hypothesized that the development of adaptive immune responses in goats vaccinated at young age depends on the environment they are raised in, and this has implications for the application of immune diagnostic tests in vaccinated dairy goats. We evaluated the early immune response to vaccination in young goat kids sourced from a MAP unsuspected non-vaccinated herd and raised in a MAP-free environment. Subsequently we compared these with responses observed in birth year and vaccination matched adult goats raised on farms with endemic paratuberculosis. Results indicated that initial adaptive immune responses to vaccination are limited in a MAP-free environment. In addition, adult antibody positive vaccinated goats raised in a MAP endemic environment are less likely to be IS900 PCR-positive as compared to antibody negative herd mates. We conclude that test-and-cull strategies in a vaccinated herd are currently not feasible using available immune diagnostic tests.
Collapse
Affiliation(s)
- Ad Koets
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, 8200 AB Lelystad, The Netherlands.
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, The Netherlands.
| | - Lars Ravesloot
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, 8200 AB Lelystad, The Netherlands
| | - Robin Ruuls
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, 8200 AB Lelystad, The Netherlands
| | - Annemieke Dinkla
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, 8200 AB Lelystad, The Netherlands
| | - Susanne Eisenberg
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht, The Netherlands
| | | |
Collapse
|
10
|
Roy Á, Infantes-Lorenzo JA, Blázquez JC, Venteo Á, Mayoral FJ, Domínguez M, Moreno I, Romero B, de Juan L, Grau A, Domínguez L, Bezos J. Temporal analysis of the interference caused by paratuberculosis vaccination on the tuberculosis diagnostic tests in goats. Prev Vet Med 2018; 156:68-75. [DOI: 10.1016/j.prevetmed.2018.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 05/04/2018] [Accepted: 05/17/2018] [Indexed: 11/29/2022]
|
11
|
Serrano M, Elguezabal N, Sevilla IA, Geijo MV, Molina E, Juste RA, Garrido JM. Preliminary Results Indicate That Inactivated Vaccine against Paratuberculosis Could Modify the Course of Experimental Mycobacterium bovis Infection in Calves. Front Vet Sci 2017; 4:175. [PMID: 29094040 PMCID: PMC5651274 DOI: 10.3389/fvets.2017.00175] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 10/02/2017] [Indexed: 11/18/2022] Open
Abstract
Although paratuberculosis (PTB) vaccination has been recognized as an effective tool to control the disease, its use has been limited in countries undergoing bovine tuberculosis (bTB) eradication programs because of its interference with the diagnostic techniques. Due to this restraint, little is known about the effect of vaccinating against PTB on the progression of bTB infection. To assess this topic, an experimental infection was carried out including the following three groups of five calves each: non-vaccinated infected with Mycobacterium bovis (NVI), vaccinated against PTB infected with M. bovis (VI), and vaccinated against PTB non-infected (VNI). The level of infection attending to pathological and bacteriological parameters was evaluated at necropsy in collected tissue samples. Infection was confirmed in all challenged animals being the lung and thoracic regions most affected for all studied parameters. The VI group presented 15.62% less gross lesions in the thoracic region than the NVI, although no significant differences were found. Only one vaccinated animal presented gross lesions in the lung, compared to three non-vaccinated calves. NVI animals showed an average of 1.8 lung lobes with gross lesions whereas in the vaccinated group the average number of affected lobes was 0.2, representing an 89% reduction. Significant differences were not found, although a tendency was observed (p = 0.126). Pathological and culture scores showed the same tendency. Vaccination induced a 71.42 and 60% reduction in lesion and culture scores in the lung as well as a 23.75 and 26.66% decline, respectively, in the thoracic region. The VI group showed lower positivity in the rest of the areas for all measured criteria except for the head. In order to reinforce our results, further research on a larger sample size is needed, but the results from this study suggest that PTB vaccination could confer certain degree of protection against bTB infection, supporting the view that PTB vaccination could increase resistance to the main mycobacterioses that affect animals.
Collapse
Affiliation(s)
- Miriam Serrano
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - Natalia Elguezabal
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - Iker A Sevilla
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - María V Geijo
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - Elena Molina
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - Ramón A Juste
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| | - Joseba M Garrido
- Animal Health Department, NEIKER-Instituto Vasco de Investigación y Desarrollo Agrario, Bizkaia Science and Technology Park, Derio, Spain
| |
Collapse
|
12
|
Mycobacterium avium subsp. paratuberculosis – An Overview of the Publications from 2011 to 2016. CURRENT CLINICAL MICROBIOLOGY REPORTS 2017. [DOI: 10.1007/s40588-017-0054-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
13
|
Serological Analysis of Tuberculosis in Goats by Use of the Enferplex Caprine TB Multiplex Test. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2017; 24:CVI.00518-16. [PMID: 27974399 DOI: 10.1128/cvi.00518-16] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 11/23/2016] [Indexed: 11/20/2022]
Abstract
Tuberculosis in goats is usually diagnosed clinically, at postmortem, or by a positive skin test. However, none of these approaches detects all infected animals. Serology offers an additional tool to identify infected animals missed by current tests. We describe the use of the Enferplex Caprine TB serology test to aid the management of a large dairy goat herd undergoing a tuberculosis breakdown. Initial skin and serology testing showed that IgG antibodies were present in both serum and milk from 100% of skin test-positive animals and in serum and milk from 77.8 and 95.4% of skin test-negative animals, respectively. A good correlation was observed between serum and milk antibody levels. The herd had been vaccinated against Mycobacterium avium subsp. paratuberculosis, but no direct serological cross-reactions were found. Subsequent skin testing revealed 13.7% positive animals, 64.9% of which were antibody positive, while 42.1% of skin test-negative animals were seropositive. Antibody responses remained high 1 month later (57.1% positive), and the herd was slaughtered. Postmortem analysis of 20 skin test-negative goats revealed visible lesions in 6 animals, all of which had antibodies to six Mycobacterium bovis antigens. The results provide indirect evidence that serology testing with serum or milk could be a useful tool in the diagnosis and management of tuberculosis in goats.
Collapse
|
14
|
Mercier P, Brémaud I, Gautier MP. Vaccination of kids under one month of age with a killed vaccine and reduction in the frequency of faecal shedding of Mycobacterium avium subspecies paratuberculosis. Small Rumin Res 2014. [DOI: 10.1016/j.smallrumres.2014.09.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
15
|
Bannantine JP, Hines ME, Bermudez LE, Talaat AM, Sreevatsan S, Stabel JR, Chang YF, Coussens PM, Barletta RG, Davis WC, Collins DM, Gröhn YT, Kapur V. A rational framework for evaluating the next generation of vaccines against Mycobacterium avium subspecies paratuberculosis. Front Cell Infect Microbiol 2014; 4:126. [PMID: 25250245 PMCID: PMC4158869 DOI: 10.3389/fcimb.2014.00126] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/20/2014] [Indexed: 12/31/2022] Open
Abstract
Since the early 1980s, several investigations have focused on developing a vaccine against Mycobacterium avium subspecies paratuberculosis (MAP), the causative agent of Johne's disease in cattle and sheep. These studies used whole-cell inactivated vaccines that have proven useful in limiting disease progression, but have not prevented infection. In contrast, modified live vaccines that invoke a Th1 type immune response, may improve protection against infection. Spurred by recent advances in the ability to create defined knockouts in MAP, several independent laboratories have developed modified live vaccine candidates by transpositional mutation of virulence and metabolic genes in MAP. In order to accelerate the process of identification and comparative evaluation of the most promising modified live MAP vaccine candidates, members of a multi-institutional USDA-funded research consortium, the Johne's disease integrated program (JDIP), met to establish a standardized testing platform using agreed upon protocols. A total of 22 candidates vaccine strains developed in five independent laboratories in the United States and New Zealand voluntarily entered into a double blind stage gated trial pipeline. In Phase I, the survival characteristics of each candidate were determined in bovine macrophages. Attenuated strains moved to Phase II, where tissue colonization of C57/BL6 mice were evaluated in a challenge model. In Phase III, five promising candidates from Phase I and II were evaluated for their ability to reduce fecal shedding, tissue colonization and pathology in a baby goat challenge model. Formation of a multi-institutional consortium for vaccine strain evaluation has revealed insights for the implementation of vaccine trials for Johne's disease and other animal pathogens. We conclude by suggesting the best way forward based on this 3-phase trial experience and challenge the rationale for use of a macrophage-to-mouse-to native host pipeline for MAP vaccine development.
Collapse
Affiliation(s)
- John P Bannantine
- Infectious Bacterial Diseases USDA-ARS, National Animal Disease Center Ames, IA, USA
| | - Murray E Hines
- Tifton Veterinary Diagnostic and Investigational Lab, The University of Georgia Tifton, GA, USA
| | - Luiz E Bermudez
- Departments of Microbiology and Biomedical Sciences, Oregon State University Corvalis, OR, USA
| | - Adel M Talaat
- Department of Pathobiological Sciences, University of Wisconsin-Madison Madison, WI, USA ; Department of Food Hygenie, Cairo University Cairo, Egypt
| | - Srinand Sreevatsan
- Veterinary Population Medicine Department, University of Minnesota Minneapolis, MN, USA
| | - Judith R Stabel
- Infectious Bacterial Diseases USDA-ARS, National Animal Disease Center Ames, IA, USA
| | - Yung-Fu Chang
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University Ithaca, NY, USA
| | - Paul M Coussens
- Department of Animal Science, Michigan State University Lansing, MI, USA
| | - Raúl G Barletta
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska Lincoln, NE, USA
| | - William C Davis
- Department of Veterinary Microbiology, Washington State University Pullman, WA, USA
| | | | - Yrjö T Gröhn
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University Ithaca, NY, USA
| | - Vivek Kapur
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University University Park, PA, USA
| |
Collapse
|
16
|
Paratuberculosis vaccination causes only limited cross-reactivity in the skin test for diagnosis of bovine tuberculosis. PLoS One 2013; 8:e80985. [PMID: 24303029 PMCID: PMC3841166 DOI: 10.1371/journal.pone.0080985] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 10/11/2013] [Indexed: 11/19/2022] Open
Abstract
Although there is a wide consensus on the efficacy of paratuberculosis vaccination to limit economic losses, its use has been restricted because of its interference in the diagnosis of tuberculosis. Data from a vaccine clinical trial in the Basque Country (Spain) has been evaluated in relationship with bovine tuberculosis intradermal test results. The trial included two herds applying a Test and Culling strategy and five applying an inactivated vaccine. The vaccine was applied to animals of all ages present in each vaccinated herd when joining the trial, and then to all the replacers within their first three months of life. Yearly testing done with the comparative intradermal test (CIT) was applied to all animals older than 6 weeks. Between 2005 and 2011, the study generated 2,033 records from Vaccinated Herds (VH) and 2,252 from Test and Cull herds (TC). Pre-vaccination positive results rate was 2.40% among the 7 herds in the single bovine intradermal tuberculin test (BSIT). Two years later it rose to 20.42% in the VH and remained below at 0.75% in the TC. Applying the CIT reduced these rates to only 0.58% in the VH and to 0.25% in the TC ons. Regarding time since each animal joined the program, the proportion of positives to BSIT was variable and, in some cases, significantly different between time points. With regard to the age of vaccination, no significant differences were found between vaccination within the first year of life and afterwards. Vaccinated animals showed seventeen times more reactions than the non-vaccinated in the BSIT, but only four times more in the CIT. In conclusion, comparative intradermal test can be a useful tool to differentiate paratuberculosis vaccine cross-reactions from specific bovine tuberculosis reactions according to the European and Spanish legislation.
Collapse
|
17
|
Technical specifications on harmonised epidemiological indicators for biological hazards to be covered by meat inspection of domestic sheep and goats. EFSA J 2013. [DOI: 10.2903/j.efsa.2013.3277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
18
|
Pérez de Val B, Nofrarías M, López-Soria S, Garrido JM, Vordermeier HM, Villarreal-Ramos B, Martín M, Puentes E, Juste RA, Domingo M. Effects of vaccination against paratuberculosis on tuberculosis in goats: diagnostic interferences and cross-protection. BMC Vet Res 2012; 8:191. [PMID: 23072619 PMCID: PMC3514378 DOI: 10.1186/1746-6148-8-191] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 10/10/2012] [Indexed: 12/13/2022] Open
Abstract
Background Most countries carrying out campaigns of bovine tuberculosis (TB) eradication impose a ban on the use of mycobacterial vaccines in cattle. However, vaccination against paratuberculosis (PTB) in goats is often allowed even when its effect on TB diagnosis has not been fully evaluated. To address this issue, goat kids previously vaccinated against PTB were experimentally infected with TB. Results Evaluation of interferon-γ (IFN-γ) secretion induced by avian and bovine tuberculins (PPD) showed a predominant avian PPD-biased response in the vaccinated group from week 4 post-vaccination onward. Although 60% of the animals were bovine reactors at week 14, avian PPD-biased responses returned at week 16. After challenge with M. caprae, the IFN-γ responses radically changed to show predominant bovine PPD-biased responses from week 18 onward. In addition, cross-reactions with bovine PPD that had been observed in the vaccinated group at week 14 were reduced when using the M. tuberculosis complex-specific antigens ESAT-6/CFP-10 and Rv3615c as new DIVA (differentiation of infected and vaccinated animals) reagents, which further maintained sensitivity post-challenge. Ninety percent of the animals reacted positively to the tuberculin cervical comparative intradermal test performed at 12 weeks post-infection. Furthermore, post-mortem analysis showed reductions in tuberculous lesions and bacterial burden in some vaccinated animals, particularly expressed in terms of the degree of extrapulmonary dissemination of TB infection. Conclusions Our results suggest a degree of interference of PTB vaccination with current TB diagnostics that can be fully mitigated when using new DIVA reagents. A partial protective effect associated with vaccination was also observed in some vaccinated animals.
Collapse
Affiliation(s)
- Bernat Pérez de Val
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Edifici CReSA, 08193, Bellaterra, Catalonia, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Juste RA. Slow infection control by vaccination: paratuberculosis. Vet Immunol Immunopathol 2012; 148:190-6. [PMID: 22698388 DOI: 10.1016/j.vetimm.2012.05.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 05/16/2012] [Accepted: 05/18/2012] [Indexed: 10/28/2022]
Abstract
Classical causality models for infectious diseases have fulfilled an important role in the progress of medical sciences, however, new forms of association where weakly pathogenic agents cause widespread infections that mostly do not progress to disease, but that if they do so, cause protracted clinical courses where the host resources are exhausted fit better with the slow infection concept proposed over half a century ago. This model could show an infectious cause behind some diseases that have never fulfilled the conventional criteria. While new mechanisms of causation are defined, these diseases still need to be controlled to allow sustainable animal production. Here, I discuss the case of paratuberculosis control by vaccination as an example of the benefits of using a theoretically preventive treatment to modify the course of infection towards preventing clinical disease even though the infection itself might not be fully controlled.
Collapse
Affiliation(s)
- Ramon A Juste
- Department of Animal Health, NEIKER-Tecnalia, Berreaga, 1, 48160 Derio, Bizkaia, Spain.
| |
Collapse
|