A behurcolástól a mentesség visszaszerzéséig – avagy BVD elleni mentesítés egy év alatt = From Viral Introduction to Regaining DiseaseFree Status: BVD Eradication within One Year

Pálfy, István and Kiss, István and Kovács, Anna (2026) A behurcolástól a mentesség visszaszerzéséig – avagy BVD elleni mentesítés egy év alatt = From Viral Introduction to Regaining DiseaseFree Status: BVD Eradication within One Year. MAGYAR ÁLLATORVOSOK LAPJA, 148 (6). pp. 323-335. ISSN 0025-004X

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Abstract

Az esetbemutatás során a szerzők részletesen ismertetik egy nagyüzemi szarvasmarhaállomány BVD (szarvasmarha vírusos hasmenése, Bovine Viral Diarrhea) mentesítésének lépéseit a korábban mentes állományba való behurcolásának kimutatásától kezdve a védekezési stratégia kidolgozásán keresztül az újbóli mentesség eléréséig. A BVD-vírussal perzisztensen fertőzött állatok kimutatására irányuló szűréssel kiegészített élővírusos vakcinás mentesítés nagyon gyorsnak és hatékonynak bizonyult. A megfelelő intézkedések mellett ebben minden bizonnyal nagy szerepet játszott az, hogy a fertőzöttséget már viszonylag korai stádiumban észlelték. Az eredmények rávilágítanak arra, hogy a fertőzöttség rendszeres monitoringvizsgálatokkal való minél korábbi felderítése esetén gyors és hatékony mentesítés hajtható végre. | Background: Bovine viral diarrhea (BVD) is a widespread infectious animal disease accompanied by fever and general symptoms, causing significant economic losses worldwide. Voluntary control programmes are present in Hungary to combat BVD virus (BVDV) infections, however, despite these efforts, the prevalence of the disease has not yet declined. Objectives: The presented case study provides a detailed description of the steps involved in BVD eradication in a large dairy herd, from the detection of the introduction of the virus into a disease-free herd, through the development of the control strategy, to the achievement of disease-free status once again. Materials and Methods: The control strategy design relied on eradication programmes published in scientific literature, and took into consideration the local conditions, including herd size, the level of BVD infection within the herd, and the available human and material resources of the farm. The key components of this strategy included the identification and removal of persistently infected (PI) animals from the herd, combined with the implementation of a vaccination programme. Vaccination successfully reduced further economic losses and prevented the development of new persistently infected (PI) animals. To ensure appropriate progress of the eradication programme, the individual steps were monitored through regular testing. These assessments included evaluation of the post-vaccination immune response, screening for newly emerging PI animals, and monitoring the circulation of BVDV within the herd using sentinel animals. Results and Discussion: Eradication based on modified live virus vaccination combined with PI screening proved to be highly effective and rapid. Within one year of initiating control measures, wild-type BVDV could no longer be detected in the herd. This outcome was most likely facilitated by the relatively low rate of infection, as well as by appropriately implemented vaccinations, sampling procedures, and the introduction of effective external and internal biosecurity measures reinforced by farm management.

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