Best of Leman 2019 #3: Three systems views on PRRS decreasing incidence

This is a favorite on the blog. Once a month, we are sharing with you a presentation given at the Allen D. Leman swine conference, on topics that the swine group found interesting, innovative or that lead to great discussions.

We can find all of the presentations selected from the previous years’ conferences on the blog here.

A few days ago, we shared a report that PRRS incidence decreased in naive breed-to-wean farms. Interesting questions were brought forward by our readers so this month, we are sharing three practitioners’ experiences with PRRS in their systems: Dr. Tara Donova with the Hanor company, Dr. Jay Miller with The Maschhoffs, and Dr. Pete Thomas from Iowa Select Farms.

Continue reading “Best of Leman 2019 #3: Three systems views on PRRS decreasing incidence”

Comparison of PRRS incidence rate in status IV breeding herds during 2009-2019

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 post is from the MSHMP team looking at status IV farms and their PRRS incidence between the years 2009 and 2019. Quick reminder, in 2011, Holtkamp et al. defined status IV farms as PRRS-negative per their shedding and exposure status.

Key points

  • PRRS incidence rate in status IV farms varied significantly from 2009 to 2019.
  • The incidence rate in status IV farms during 2019 was one of the lowest on record and comparable to the one observed in 2013 and 2014; the years of the PED epidemic in the US.
  • PRRS incidence in status IV farms during 2019 was significantly lower than the one of 2015 and 2016 and marginally non-significant lower (p=0.07) than the one of 2018.
Continue reading “Comparison of PRRS incidence rate in status IV breeding herds during 2009-2019”

PRRS incidence rate trends from 2015 to 2019 in the United States

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.

Key Points

  • Overall PRRS weekly incidence rate appear to have increased from 2015 to 2019, mostly due to the effect of a group of systems that joined the project after 2013.
  • PRRS weekly incidence rate has been decreasing slightly since 2015 in the cohort of the 13 systems that initiated the project.
  • The reasons for the apparent increase in the weekly incidence rate in a group of systems are largely unknown and should be further investigated.
Continue reading “PRRS incidence rate trends from 2015 to 2019 in the United States”

MSHMP Incidence Year 2018/2019 Annual Summary

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.

Today, we are sharing the 2018/2019 summary for the Morrison Swine Health Monitoring Program from the MSHMP team lead, Dr. Cesar Corzo and what his vision for the future is.

Continue reading “MSHMP Incidence Year 2018/2019 Annual Summary”

PRRS incidence rate by status at break

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.

Key points

  • Current PRRS Chart 3 incidence risk by status does not take into account the time at risk farms contribute to each status.
  • Incidence rate takes into account the time a farm is at risk of disease.
  • Chart 3 will be replaced by a incidence rate chart that reflects more accurately the PRRS outbreak rate by status.
Continue reading “PRRS incidence rate by status at break”