Prevalence comparison among different MSHMP cohorts

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.

University of Minnesota researchers Mariana Kikuti, Miranda Medrano, Marcello Melini, Carles Vilalta, Juan Sanhueza, Emily Geary, Cesar Corzo compare PRRSV disease status between systems that originally shared their sow herd status with MSHMP and those that joined the program later.

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PRRS 2021-2022 Exponentially Weighted Moving Average (EWMA) by State

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 we take a look at PRRS EWMA patterns in Iowa, North Carolina, Minnesota, Oklahoma, Nebraska and Illinois, thanks to research done by Mariana Kikuti, Emily Geary, Paulo Fioravante, Marcello Melini, Miranda Medrano, Cesar Corzo.

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Antimicrobial use, PRRS, and the microbiome with McKnight Land-Grant Professor Noelle Noyes

Dr. Noelle Noyes received the 2022 McKnight Land-Grant Professorship for her work on Microbes for Sustainable Intensification of Livestock Production. As the human population expands, so does its demand for protein. Livestock farmers must meet this demand, but their land and water are shrinking rapidly, meaning they must produce more with less. Dr. Noyes confronts this challenge through scientific discovery of the livestock microbiome.

Noyes receives 2022 McKnight Land-Grant Professorship

In one of their latest studies in collaboration with Pipestone Systems and Dr. Peter Davies, the Noyes lab evaluates the impact of antimicrobial use on resistance patterns in PRRS-infected pigs. The publication is available in open access in the Applied and Environmental Microbiology journal.

Despite a recognized need for more longitudinal studies to assess the effects of antimicrobial use on resistance in food animals, they remain sparse in the literature, and most longitudinal studies of pigs have been observational. The current experimental study had the advantages of greater control of potential confounding, precise measurement of antimicrobial exposures which differed markedly between groups and tracking of pigs until market age. Overall, resistance patterns were remarkably stable between the treatment groups over time, and the differences observed could not be readily reconciled with the antimicrobial exposures, indicating the likely importance of other determinants of antimicrobial resistance at the population level.

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What monitoring taught us about PRRS: a podcast episode

Dr. Cesar Corzo shares what he has learned about PRRS since becoming the lead investigator of the Morrison Swine Health Monitoring Project (MSHMP) in an episode of the Swine Doc Pod with Carthage.

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Environmental contamination assessment in farms undergoing an outbreak with PRRS 1-4-4 Lineage 1C

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 Morrison Swine Health Monitoring Project take a look at whether PRRSv cases associated with the linage 1C, RFLP 1-4-4 variant can be detected in the outside areas of farms undergoing an outbreak.

Key Points

  • There is little understanding of contributing factors aiding the 1-4-4 L1C PRRSv rapid transmission and biosecurity breaches
  • Environmental detection in recently infected farms was possible although detection was low
  • Most positive samples originated from exhausting fans, showing the virus may exit a positive barn via that route
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