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Interaction of swine influenza A virus infection with PRRS MLV vaccination in piglets

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Patricia Renson (Ifip et Anses) et al., 11th European Symposium of Porcine Management (ESPHM), 22-24 mai 2019, Utrecht, Pays-Bas

Swine influenza A virus (swIAV) is a major respiratory pathogen frequently circulating after weaning, a period commonly used to implement PRRS MLV vaccination in piglets. SwIAV infection was previously shown to induce a strong IFN? response. A recent study also showed that IFN? could abrogate the replication of a PRRSV-2 MLV and the inherent immune response.

PDF icon Patricia Renson (Ifip et Anses) et al., 11th ESPHM, 22-23-24 mai 2019, Utrecht, Pays-Bas
2019

PRRS post-vaccinal immune response to MLV in PRRS multivaccinaled sows

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Christelle Fablet (Anses) et al., 11th European Symposium of Porcine Management (ESPHM), 22-24 mai 2019, Utrecht, Pays-Bas

PRRS MLV vaccines are used to prevent reproductive disorders due to PRRSV in sows. Vaccine efficacy was proven only in sows vaccinated once or twice. In vaccinated herds, sows receive multiple vaccine boosters. To date, no data are available on the maintenance of PRRS immunity during these multiple revaccinations.

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2019

Impact of PCV2 co-infection on replication level of a field vaccine-like PRRSV-1 strain

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Julie Eclercy (Anses) et al., 11th European Symposium of Porcine Management (ESPHM), 22-23-24 mai 2019, Utrecht, Pays-Bas

In pig herds, PRRSV is often associated with PCV2, this co-infection being one key factor leading to postweaning multisystemic wasting syndrome (PMWS). Worryingly, association of a PRRSV modified live vaccine of Type 2 (MLV2) with PCV2 infection was also shown to induce PMWS.
In a French pig farm presenting a clinical presentation of PMWS, we identified a MLV1-like strain in coinfection with PCV2. Through an in vivo experiment, we aimed at evaluating the impact of PCV2 co-infection on virulence level of these MLV1-like and parental MLV1 strains.

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2019

A field recombinant strain derived from two type 1 porcine reproductive and respiratory syndrome virus (PRRSV-1) modified live vaccines shows increased viremia and transmission in SPF pigs

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Julie Eclercy et al., Viruses, 2019, 23 mars, volume 11, n° 3, 13 pages

In Europe, modified live vaccines (MLV) are commonly used to control porcine reproductive and respiratory syndrome virus (PRRSV) infection. However, they have been associated with safety issues such as reversion to virulence induced by mutation and/or recombination. On a French pig farm, we identified a field recombinant strain derived from two PRRSV-1 MLV (MLV1). As a result, we aimed to evaluate its clinical, virological, and transmission parameters in comparison with both parental strains. Three groups with six pigs in each were inoculated with either one of the two MLV1s or with the recombinant strain; six contact pigs were then added into each inoculated group. The animals were monitored daily for 35 days post-inoculation (dpi) for clinical symptoms; blood samples and nasal swabs were collected twice a week. PRRS viral load in inoculated pigs of recombinant group was higher in serum, nasal swabs, and tonsils in comparison with both vaccine groups. The first viremic contact pig was detected as soon as 2 dpi in the recombinant group compared to 10 and 17 dpi for vaccine groups. Estimation of transmission parameters revealed fastest transmission and longest duration of infectiousness for recombinant group. Our in vivo study showed that the field recombinant strain derived from two MLV1s demonstrated high viremia, shedding and transmission capacities.

https://www.mdpi.com/1999-4915/11/3/296/pdf

2019
S.D.R.P - Savoir le reconnaître et le maîtriser

S.D.R.P - Savoir le reconnaître et le maîtriser

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Informations pratiques pour techniciens et éleveurs. Historique de la maladie et caractéristiques du virus, mode de diffusion. Symptômes et pertes économiques. Voies de contaminations et mesures de prévention. Dépistage et stratégies de lutte selon la situation régionale.



Édition 1999 - Plaquette Ifip, Coop de France, FNGDS, ASAMIP, AFSSA - 4 pages

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1999