Results of a control programme for the porcine reproductive and respiratory syndrome in the French ‘Pays de la Loire’ region

Potier, M.F. Le; Blanquefort, Philippe; Morvan, E.; Albina, Emmanuel

doi:10.1016/s0378-1135(96)01318-1

Cited by 40 publications

(36 citation statements)

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“…In France, the virus prevalence is very high in densely populated pig areas such as Brittany, the main pig production area in the country [2]. In other French areas, some control strategies set up shortly after the introduction of the virus in the 1990's and based on active surveillance and early elimination of infected units, led to different regional statuses in the country [3]. Heterogeneity of statuses between areas in France or in Europe due to different management policies of the virus may lead to sanitary requirements for pig movements within the country or the Union.…”

Section: Q3mentioning

confidence: 99%

Porcine reproductive and respiratory syndrome virus (PRRSv) modified-live vaccine reduces virus transmission in experimental conditions

Rose

Renson

Andraud

et al. 2015

Vaccine

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Section: Q3mentioning

confidence: 99%

Porcine reproductive and respiratory syndrome virus (PRRSv) modified-live vaccine reduces virus transmission in experimental conditions

Rose

Renson

Andraud

et al. 2015

Vaccine

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“…All Italian PRRSV strains were of genotype 1 and exhibited high nucleotide variability [8-10]. PRRSV can be transmitted via semen [11], contact between pigs [12], contaminated transport vehicles [13] and aerial spread [14]. Clarification of the mechanisms of the virus spread and differentiation by study of the relationship between genetic, geographical and temporal variability of PRRSV may help in the development of better strategies to control the PRRSV spread.…”

Section: Introductionmentioning

confidence: 99%

Impact of genetic variation and geographic distribution of porcine reproductive and respiratory syndrome virus on infectivity and pig growth

et al. 2013

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BackgroundThe porcine reproductive and respiratory syndrome (PRRS) is a devastating disease for the pig industry. In this study, we analysed the genetic variability of PRRS virus (PRRSV) as well as the relationship between the genetic variability, the geographical and temporal distribution of the PRRSV strains. Moreover, we investigated the association between the glycosylation patterns in PRRSV sequences and pigs growth.ResultsThe data highlight that PRRSV strains evolve rapidly on individual farms, and temporal evolution of PRRSV is an important factor of genetic variability. Analysis of glycosylation sites in the glycoprotein 5 (GP5) ectodomain revealed that PRRSV isolates had seven combinations of putative N-linked glycosylation sites of which the N37/46/53 sites was found in 79% of the sequences. No significant relationship was found between the genetic variation of the PRRSV strains and the geographic distance. A significant relationship was found between the genetic variation and time of sampling when farm was considered as a factor in the analysis. Furthermore, the commercial semen from artificial insemination centres was not a source of PRRS transmission.The PRRSV having the glycosylation site at position N46 (N46+) were observed to have higher burden on pigs and accordingly the corresponding infected pigs had lower average daily gain (ADG) compared with those infected with PRRSV lacking the glycosylation at N46 (N46-) position site. This study showed that the number of piglets by litter infected by PRRSV was lower for the Landrace breed than for the other studied breeds (Large White, Duroc and Pietrain).ConclusionsThe PRRSV genetic variability which is determined by a local and temporal evolution at the farm level could be considered in a perspective of prevention. Moreover, the association between the PRRSV glycosylation patterns and its virulence could be of interest for vaccine development. The differences of resistance to PRRSV infections among pig breeds might open new horizons for the genetic selection of robustness against PRRSV infection.

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“…(Fig. 1) [6,7,28,34], 그 결과, 다양한 농장단위 근절사례가 보고되어 왔으며, 최근에는 북미와 유럽에서 지역 단위 또는 국가단위의 근절계획이 추진되고 있다 [15,18]. 우리 나라에서도 PRRS 근절을 위한 농장단위의 시도와 성공사례 가 일부 보고된 바 있지만 [25,32] …”

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Comparison of Serological and Virological Analysis for Infection Patterns of Porcine Reproductive and Respiratory Syndrome Virus to Establish a Farm Level Control Strategy

2009

Journal of Life Science

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-Porcine reproductive and respiratory syndrome virus (PRRSV) has plagued pig populations worldwide causing severe economical impacts. In order to establish effective strategies for prevention of PRRS, infection patterns on the herd level are primarily evaluated. In the present study, therefore, serological and virological analyses were conducted in 20 pig farms suffering from PRRS. Seroprevalence levels in each farm were grouped into 3 patterns: SN (Stable sow groups/Not infected piglet groups, SI (Stable sow groups and Infected piglet groups), and UI (Unstable sow groups and Infected piglet groups). The rates of each serological pattern were 15% (n=3), 10% (n=2), and 75% (n=15), respectively. In addition, the pattern analysis was extended to virological monitoring on the same farms that further included suckling pig groups. As a result, the infection pattern was classified into 4 categories: SNI (Stable sow groups/Not infected suckler groups/Infected piglet groups), SII (Stable sow groups/Infected suckler groups/Infected piglet groups), UNI (Unstable sow groups/Not infected suckler groups/Infected piglet groups), and UII (Unstable sow groups/Infected suckler groups/Infected piglet groups). The rates of each viroprevalence were estimated at 50% (n=10), 30% (n=6), 10% (n=2), and 10% (n=2), respectively. PRRSV viroprevalence results of suckling pig groups revealed that 8 farms were considered virus positive. In 2 farms among these farms, PRRSV appeared to be transmitted vertically to suckling piglets from their sows. In contrast, piglet-to-piglet horizontal transmission of PRRSV seemed to occur in sucking herds of the remaining farms. Thus, this virological analysis on suckling piglets will provide useful information to understand PRRSV transmission routes during the suckling period and to improve a PRRS control programs. Our seroprevalence and viroprevalence data found that infection patterns between sow and piglet groups are not always coincident in the same farm. Remarkably, 15 farms belonging to the UI seroprevalence pattern showed four distinct viroprevalence patterns (SNI; 7, SII; 4, UNI; 2 and UII; 2). Among these farms, 11 farms with unstable seroprevalence sow groups were further identified as the stable viroprevalence pattern. These results indicated that despite the absence of typical seroconversion, PRRSV infection was detected in several farms, implying the limitation of serological analysis. Taken together, our data strongly suggests that both seroprevalence and viroprevalence should be determined in parallel so that a PRRS control strategies can be efficiently developed on a farm level.

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Results of a control programme for the porcine reproductive and respiratory syndrome in the French ‘Pays de la Loire’ region

Cited by 40 publications

References 1 publication

Porcine reproductive and respiratory syndrome virus (PRRSv) modified-live vaccine reduces virus transmission in experimental conditions

Porcine reproductive and respiratory syndrome virus (PRRSv) modified-live vaccine reduces virus transmission in experimental conditions

Impact of genetic variation and geographic distribution of porcine reproductive and respiratory syndrome virus on infectivity and pig growth

Comparison of Serological and Virological Analysis for Infection Patterns of Porcine Reproductive and Respiratory Syndrome Virus to Establish a Farm Level Control Strategy

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