Eradication of PRRS from backyard swine herds in Hungary between 2012 and 2018

Nemes, Imre; Molnár, Tamás; Abonyi, Tamás; Terjék, Zsolt; Bálint, Ádám; Szabó, István

doi:10.1556/004.2019.053

Cited by 14 publications

(21 citation statements)

References 2 publications

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“…In the present paper, the process of PRRS eradication from large-scale breeding farms in five regions of Hungary is discussed in detail. We have already reported the results of PRRS eradication from small pig farms (Nemes et al, 2019) and large-scale fattening units (Szab o et al, 2019) in the country.…”

Section: Discussionmentioning

confidence: 99%

“…This paper summarises the experiences of PRRS eradication from large-scale pig breeding farms in five regions of Hungary. This campaign, together with PRRS eradication from the large-scale fattening units and the backyard swine population (Nemes et al, 2019;Szab o et al, 2019), has resulted in the largest PRRS-eradicated confluent area within the European Union, representing 1.29% of its whole territory.…”

Section: Introductionmentioning

confidence: 99%

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PRRS eradication from swine farms in five regions of Hungary

Szabó

Bognár

Molnár

et al. 2020

AVet

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Porcine reproductive and respiratory syndrome (PRRS) causes significant losses to the swine industry worldwide, which leads to launching eradication programmes. The PRRS eradication programme in Hungary is based on the territorial principle, and it is obligatory for each swine farm irrespective of the number of animals kept there. Hungary has an exceptionally large herd size in large-scale pig farms. Large fattening farms operate as all-in/all-out or continuous flow systems. The large-scale breeding herds are predominantly farrow-to-finish types. In large-scale breeding farms, PRRS eradication was carried out by the depopulation-repopulation method in 33 farms, of which 23 received state compensation, 18 farm units either finished production or changed to producing fatteners only. Two farms used the test and removal method for eradication. One farm was classified as ‘vaccinated free’. At this farm the breeding animals are vaccinated continuously but there is no vaccination of the progeny at any age, and the PRRS-free status of the farm is strictly controlled and monitored. By 31 December 2019, all pigs in five euroregions of Hungary had become free from PRRS virus, while the PRRS eradication process is still ongoing in the remaining two regions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PRRS eradication from swine farms in five regions of Hungary

Szabó

Bognár

Molnár

et al. 2020

AVet

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“…As a result of the implemented program introduced in 2014, swine population of 10 out of 19 counties of Hungary became officially free from PRRSV by the end of 2018. To the authors' knowledge, this is the largest successful European PRRSV area elimination project [8][9][10] .…”

Section: Investigations On Spreading Of Prrsv Among Swine Herds By Immentioning

confidence: 99%

Investigations on spreading of PRRSV among swine herds by improved minimum spanning network analysis

Szabó

Szalay

Kecskeméti

et al. 2020

Sci Rep

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In Hungary, the economic losses caused by porcine reproductive and respiratory syndrome virus (PRRSV) led to the launching of a national PRRSV Eradication Program. An important element of the program was investigating the spread of PRRSV among swine herds and the possible ways of introduction by sequencing of the open reading frame 5 (ORF5) gene. However, the classical phylogenetic tree presentation cannot explain several genetic relationships clearly, while more precise visualization can be represented by network tree diagram. In this paper, we describe a practical and easy-to-follow enriched minimum spanning similarity network application for improved representation of phylogenetic relations among viral strains. This method eliminated the necessity of applying a predefined, arbitrary cut-off or computationally extensive algorithms. The network-based visualization allowed processing and visualizing large amount of data equally for the laboratory, private and official veterinarians, and helped identify the potential connections between different viral sequences that support data-driven decisions in the eradication program. By applying network analysis, previously unknown epidemiological connections between infected herds were identified, and virus spreading was analyzed within short period of time. In our study, we successfully built and applied network analysis tools in the course of the Hungarian PRRSV Eradication Program.

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“…Its specifications were laid down in Hungarian national legislation. Results have already been published regarding the eradication of PRRSV infection in backyard pigs and large-scale fattening herds by performing polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) testing followed by regional eradication based on administrative measures (depopulation with state compensation, control of animal movement) [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Elimination of porcine reproductive and respiratory syndrome virus infection using an inactivated vaccine in combination with a roll-over method in a Hungarian large-scale pig herd

Pertich¹,

Barna²,

Makai³

et al. 2022

Acta Vet Scand

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Background Porcine reproductive and respiratory syndrome virus (PRRSV) causes severe economic losses worldwide and only four countries in Europe are free from PRRSV. Complete depopulation–repopulation is the safest and fastest, but also the most expensive method for eradicating PRRSV from a population. Another possible way to eliminate an endemic PRRSV infection is to replace the infected breeding stock by gilts reared isolated and protected from PRRSV on an infected farm. With this method it is possible to maintain continuous production on the farm. The authors report the first successful elimination of PRRSV in a Hungarian large-scale pig farm by using an inactivated vaccine and performing segregated rearing of the offspring. Case presentation The study was performed on a PRRSV infected farm (Farm A) with 1475 sows. The clinical signs of reproductive failure had been eliminated previously by using an inactivated vaccine (Progressis®, Ceva). At the beginning of the elimination programme, gilts intended for breeding were vaccinated at 60 and 90–100 days of age. After that, gilts selected for breeding were vaccinated at 6 months of age, on the 60–70th day of pregnancy and at weaning. Approximately 1200 piglets from vaccinated sows were transported at 7 weeks of age to a closed, empty farm (Farm B) after being tested negative for PRRSV by a polymerase chain reaction (PCR) method, and then were reared here until 14 weeks of age. At this age, all pigs were tested by PRRS ELISA. Seronegative gilts (n = 901) were subsequently transported from Farm B to a third, closed and empty farm (Farm C), and (having reached the breeding age) they were inseminated here after a second negative serological test (ELISA). At the same time, Farm A was depopulated, cleaned and disinfected. All pregnant gilts were transported from Farm C to Farm A after being re-tested negative for antibodies against PRRSV. Follow-up serology tests were performed after farrowing and results yielded only seronegative animals. Based on the subsequent negative test results, the herd was declared PRRSV free by the competent authority. Conclusions The presented farm was the first during the National PRRS Eradication Programme of Hungary to eradicate PRRSV successfully by vaccinating the sows with an inactivated vaccine and performing segregated rearing of the offspring. Production was almost continuous during the whole process of population replacement.

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Eradication of PRRS from backyard swine herds in Hungary between 2012 and 2018

Cited by 14 publications

References 2 publications

PRRS eradication from swine farms in five regions of Hungary

PRRS eradication from swine farms in five regions of Hungary

Investigations on spreading of PRRSV among swine herds by improved minimum spanning network analysis

Elimination of porcine reproductive and respiratory syndrome virus infection using an inactivated vaccine in combination with a roll-over method in a Hungarian large-scale pig herd

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