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O’Brien A, Hayton A, Cutler K, Adler A, Shaw DJ, Clarke J, Watt N, Harkiss GD. Diagnostic accuracy of the Enferplex Bovine TB antibody test using individual milk samples from cattle. PLoS One 2024; 19:e0301609. [PMID: 38687765 PMCID: PMC11060599 DOI: 10.1371/journal.pone.0301609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/19/2024] [Indexed: 05/02/2024] Open
Abstract
Bovine tuberculosis is usually diagnosed using tuberculin skin tests or at post-mortem. Recently, we have developed a serological test for bovine tuberculosis in cattle which shows a high degree of accuracy using serum samples. Here, we have assessed the performance of the test using individual bovine milk samples. The diagnostic specificity estimate using the high sensitivity setting of the test was 99.7% (95% CI: 99.2-99.9). This estimate was not altered significantly by tuberculin boosting. The relative sensitivity estimates of the test using the high sensitivity setting in milk samples from comparative skin test positive animals was 90.8% (95% CI: 87.1-93.6) with boosting. In animals with lesions, the relative sensitivity was 96.0% (95% CI: 89.6-98.7). Analysis of paired serum and milk samples from skin test positive animals showed correlation coefficients ranging from 0.756-0.955 for individual antigens used in the test. Kappa analysis indicated almost perfect agreement between serum and milk results, while McNemar marginal homogeneity analysis showed no statistically significant differences between the two media. The positive and negative likelihood ratio were 347.8 (95% CI: 112.3-1077.5) and 0.092 (95% CI: 0.07-0.13) respectively for boosted samples from skin test positive animals. The results show that the test has high sensitivity and specificity in individual milk samples and thus milk samples could be used for the diagnosis of bovine tuberculosis.
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Affiliation(s)
| | | | - Keith Cutler
- Synergy Farm Health, Maiden Newton, Dorset, United Kingdom
| | - Andy Adler
- Synergy Farm Health, Maiden Newton, Dorset, United Kingdom
| | - Darren J. Shaw
- Royal (Dick) School of Veterinary Studies & The Roslin Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - John Clarke
- Enfer Scientific, Naas, County Kildare, Ireland
| | - Neil Watt
- MV Diagnostics Ltd, Roslin Innovation Centre, University of Edinburgh, Edinburgh, United Kingdom
| | - Gordon D. Harkiss
- MV Diagnostics Ltd, Roslin Innovation Centre, University of Edinburgh, Edinburgh, United Kingdom
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Bouzalas I, Apostolidi ED, Scalas D, Davidopoulou E, Chassalevris T, Rosati S, Colitti B. A Combined Approach for the Characterization of Small Ruminant Lentivirus Strains Circulating in the Islands and Mainland of Greece. Animals (Basel) 2024; 14:1119. [PMID: 38612358 PMCID: PMC11010947 DOI: 10.3390/ani14071119] [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: 03/13/2024] [Revised: 04/04/2024] [Accepted: 04/05/2024] [Indexed: 04/14/2024] Open
Abstract
Small ruminant lentiviruses are a group of viruses infecting goat and sheep worldwide. These viruses exhibit an extraordinary degree of genetic and antigenic variability that severely influence in vivo and in vitro features, as well as diagnostic test results. Small ruminant farming is the most important animal farming business in Greece, with a high impact on the Greek primary economy. Although SRLV infection and its impact on animal production are well established in the country, little is known about the circulating SRLV strains and their prevalence. The aim of this study was to characterize SRLVs circulating in Greece with a combined serological and molecular approach, using the bulk milk matrix collected from 60 farms in different municipalities. This study allowed us to estimate a seroprevalence of around 52% at the herd level. The B1, B2 and A3 subtypes and a novel A viral cluster were identified. Moreover, the amplicon sequencing method allowed us to identify more than one viral subtype in a sample. These results again confirm the high variability of these viruses and highlight the importance of the constant monitoring of viral evolution, in particular in antigens of diagnostic interest.
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Affiliation(s)
- Ilias Bouzalas
- Hellenic Agricultural Organization—DEMETER, Veterinary Research Institute, Campus of Thermi, 57001 Thessaloniki, Greece; (I.B.); (E.D.A.); (T.C.)
| | - Evangelia D. Apostolidi
- Hellenic Agricultural Organization—DEMETER, Veterinary Research Institute, Campus of Thermi, 57001 Thessaloniki, Greece; (I.B.); (E.D.A.); (T.C.)
| | - Daniela Scalas
- Department of Veterinary Sciences, University of Turin, L. Braccini 2, 10095 Torino, Italy; (D.S.); (S.R.)
| | | | - Taxiarchis Chassalevris
- Hellenic Agricultural Organization—DEMETER, Veterinary Research Institute, Campus of Thermi, 57001 Thessaloniki, Greece; (I.B.); (E.D.A.); (T.C.)
| | - Sergio Rosati
- Department of Veterinary Sciences, University of Turin, L. Braccini 2, 10095 Torino, Italy; (D.S.); (S.R.)
| | - Barbara Colitti
- Department of Veterinary Sciences, University of Turin, L. Braccini 2, 10095 Torino, Italy; (D.S.); (S.R.)
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Yáñez U, Álvarez J, Pisón C, Acción A, Becerra JJ, Jiménez A, Gisbert P, Herradón PG, Peña AI, Prieto A, Díaz-Cao JM, Quintela LA. Prevalence, Risk Factors, and Relationship between Reproductive Performance and the Presence of Antibodies against Coxiellosis in Dairy Farm Milk Tanks in the Northwest of Spain. Animals (Basel) 2024; 14:367. [PMID: 38338010 PMCID: PMC10854522 DOI: 10.3390/ani14030367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 02/12/2024] Open
Abstract
Q fever is a zoonotic disease that has been associated with reproductive problems in animals. As there is little epidemiological data regarding the distribution and risk factors of this disorder in cattle, the objective of this study was to evaluate the prevalence of Coxiella burnetii among dairy herds in the northwest of Spain, and to determine the on-farm risk factors associated with the disease and its effects on reproductive performance. Bulk tank milk (BTM) samples were collected from 262 commercial dairy herds from A Coruña, Lugo, and Pontevedra provinces. Data about location, mean age, and herd management features were obtained. A commercial indirect ELISA kit was used to determine the presence of antibodies against C. burnetii in BTM samples. The relationship between seropositivity to C. burnetii and the risk factors was checked using a Pearson's χ2 test and a classification tree analysis. In addition, a one-way ANOVA test and the Mann-Whitney U test were used to check the impact of seropositivity to C. burnetii on reproductive performance. A total of 60.1% of the farms tested positive for coxiellosis, the herd size, the external purchase of livestock, and the geographical area were identified as the main risk factors. Conception rate and first-service conception rate were significantly lower (p < 0.05) in positive farms (37.1 and 32.9%) compared to negative farms (39.8 and 36.1%). Similarly, positive farms had significant higher incidence of endometritis (13.7% vs. 11.2%, p < 0.05). Consequently, a high seropositivity and slightly negative effects of coxiellosis on reproductive performance were observed, which intensifies the need for further research, including the identification an active infection in positive herds and the characterization of the genotype.
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Affiliation(s)
- Uxía Yáñez
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
| | - Jacobo Álvarez
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
| | - Cristina Pisón
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
| | - Antía Acción
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
| | - Juan J. Becerra
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
- IBADER, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (A.P.); (J.M.D.-C.)
| | - Antonio Jiménez
- CEVA SALUD ANIMAL S.A., Avda. Diagonal 609-615, 08028 Barcelona, Spain;
| | - Philippe Gisbert
- CEVA SANTE ANIMALE, Avenue de la Ballastière 10, 33500 Libourne, France;
| | - Pedro G. Herradón
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
- IBADER, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (A.P.); (J.M.D.-C.)
| | - Ana I. Peña
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
| | - Alberto Prieto
- IBADER, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (A.P.); (J.M.D.-C.)
- INVESAGA Group, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain
| | - José M. Díaz-Cao
- IBADER, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (A.P.); (J.M.D.-C.)
- INVESAGA Group, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain
| | - Luis A. Quintela
- Unit of Reproduction and Obstetrics, Department of Animal Pathology, Faculty of Veterinary Medicine, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (U.Y.); (J.Á.); (C.P.); (A.A.); (J.J.B.); (P.G.H.); (A.I.P.)
- IBADER, Campus Terra, Universidade de Santiago de Compostela, Avda. Carballo Calero s/n, 27002 Lugo, Spain; (A.P.); (J.M.D.-C.)
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