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Colitti B, Muratore E, Careddu ME, Bertolotti L, Iotti B, Giacobini M, Profiti M, Nogarol C, Böttcher J, Ponzo A, Facelli R, Rosati S. Field application of an indirect gE ELISA on pooled milk samples for the control of IBR in free and marker vaccinated dairy herds. BMC Vet Res 2018; 14:387. [PMID: 30518363 PMCID: PMC6282388 DOI: 10.1186/s12917-018-1716-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 11/26/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The aim of the present study was to assess the reliability of a new strategy for monitoring the serological response against Bovine Herpesvirus 1 (BoHV1), the causative agent of infectious bovine rhinotracheitis (IBR). Bulk milk samples have already been identified as cost effective diagnostic matrices for monitoring purposes. Nevertheless, most eradication programs are still based on individual standard assays. In a region of northwestern Italy (Piedmont), the voluntary eradication program for IBR has become economically unsustainable. Being the prevalence of infection still high, glycoprotein E-deleted marker vaccines are commonly used but gE blocking ELISAs are less sensitive on bulk milk samples compared to blood serum. RESULTS A recently developed indirect gE ELISA showed high versatility when applied to a wide range of matrices. In this study, we applied a faster, cost effective system for the concentration of IgG from pooled milk samples. The IgG enriched fractions were tested using a gE indirect ELISA for monitoring purposes in IBR-positive and IBR-marker-vaccinated herds. Official diagnostic tests were used as gold standard. During a 3 years study, a total 250 herds were involved, including more than 34,500 lactating cows. The proposed method showed a very good agreement with official diagnostic protocols and very good diagnostic performances: only 37 positive animals were not detected across the entire study. CONCLUSIONS The results highlighted the ability of the proposed method to support the surveillance of IBR in the Piedmont region, reducing the costs without affecting the diagnostic performances.
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Affiliation(s)
- Barbara Colitti
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Elvira Muratore
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Maria Elena Careddu
- Istituto Zooprofilattico Sperimentale del Piemonte della Liguria e della Valle D’Aosta (IZSPLV), 12100 Cuneo, Italy
| | - Luigi Bertolotti
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Bryan Iotti
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Mario Giacobini
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Margherita Profiti
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Chiara Nogarol
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
| | - Jens Böttcher
- Tiergesundheitsdienst bayern e.V, 85586 Poing, Germany
| | - Andreino Ponzo
- Azienda sanitaria locale Cuneo (ASL CN1), 12100 Cuneo, Italy
| | - Roberto Facelli
- Associazione Regionale Allevatori Piemonte (ARAP), 12020 Madonna dell’Olmo, Cuneo, Italy
| | - Sergio Rosati
- Department of Veterinary Science, University of Turin, Largo Paolo Braccini, 2 10095 Grugliasco, Turin, Italy
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