PRRSV 1-7-4 ORF5 diversity over time

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week, the MSHMP team is looking at 16 years of genetic diversity of ORF-5 from the PRRS virus sequences submitted by the MSHMP participants

Key Points

  • PRRSV ORF5 sequence monitoring over time contributes to the understanding of pathogen evolution.  
  • Range of PRRSV 1-7-4 percent divergence has decreased over the last 16 years between 2003 and 2019, which is consistent with lineage turnover previously described.
  • PRRSV 1-7-4 can belong to a specific lineage or sublineage, 1A being the most common currently.
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Role of stress on early pathogenesis of Senecavirus A in pigs

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week, Dr. Guilherme Preis, phD candidate with Dr. Fabio Vannucci shares results of his latest research on stress and its influence on Senecavirus A.

Key points

  • Impact of a stress model on the early pathogenesis of Senecavirus A was evaluated.
  • Time to detect replicating virus in snout skins and coronary bands was 48 hours post inoculation.
  • Naïve animals likely do not have enough time to develop vesicles during most transportation events, if exposed via the nasal route.
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Litter birth weight phenotype and its influence on embryonic and placental development at day 30 of gestation

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

The Science Page this week is a collaboration between the University of Alberta and Hendrix Genetics regarding low litter birth weight phenotypes in sows.

Key points

  • In every herd there is a population of sows that produce low birth weight piglets independent of the litter size
  • The litter birth weight phenotype (LBWP) is a sow-related phenotype
  • Low LBWP sows show delayed embryonic and placental development on day 30 of gestation
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Effect of intervention practices to control the porcine epidemic diarrhea (PED) outbreak during the first epidemic year (2013-2014) on time to absence of clinical signs and the number of dead piglets per sow in Japan

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week, the MSHMP team shares their summary of a publication on the intervention practices put in place in Japanese herds to control Porcine Epidemic Diarrhea.

Key Points

  • There was little to no research on factors affecting time to absence of clinical signs (TAC) and dead piglets/sow (DP/S) during PED infections.
  • Good external biosecurity in the form of clean transport methods and one-way truck entrances is significantly associated with lower TAC and DP/S.
  • The timing of feedback relative to the PED outbreak was more important than the method of feedback.
Continue reading “Effect of intervention practices to control the porcine epidemic diarrhea (PED) outbreak during the first epidemic year (2013-2014) on time to absence of clinical signs and the number of dead piglets per sow in Japan”

PRRS Outbreak Management Project (POMP)

This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.

This week, researchers from Iowa State University and the University of Minnesota are inviting you to participate in their next PRRS outbreak management project in collaboration with Carthage Veterinary Service.

Continue reading “PRRS Outbreak Management Project (POMP)”