Transmission of a live influenza A virus vaccine in commercial pre-weaned pigs

The Plos One journal just published a new study by Dr. Gustavo Lopez and the Torremorell lab. The objectives of the project were to  1)assess the onset and duration of live attenuated influenza vaccine shedding in vaccinated pre-weaned pigs, 2)investigate the transmission of the live attenuated influenza vaccine from vaccinated to non-vaccinated pigs under field conditions and 3)evaluate whether the live attenuated influenza vaccine could be aerosolized and detected in the environment.

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Comparison of samplers collecting airborne influenza viruses: 1. Primarily impingers and cyclones

Researchers from the University of Minnesota School of Public Health and College of Veterinary Medicine are publishing a series of articles in PLOS ONE comparing the various air samplers used to detect airborne viruses such as influenza. This first publication, available in open access, focuses on impingers and cyclones.

Highlights

  • Higher quantities of virus were recovered by high flow rate samplers
  • Lower flow rate samplers performed better when virus concentrations were high
  • Based on the question of interest, a different air sampler might be more efficient.
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Impact of nurse sows on influenza A virus transmission

A study by the Torremorell group was recently published in the Preventive Veterinary Medicine Journal. In this publication, Dr. Jorge Garrido-Mantilla et al. evaluated if piglets put together with a nurse sow were more likely to be influenza A positive and conversely, if a nurse sow could become infected when adopting a litter of positive piglets.

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Which wipes are better to detect flu: udder skin or nasal wipes?

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. Albert Canturri from the Torremorell lab is sharing results on a study looking at udder skin wipes and piglet nasal wipe to detect swine influenza.

Key points

  • Various wipe types can be used to sample IAV from the udder skin of lactating sows. Although differences between wipe types were not seen, wipes that were wet provided a better detection rate than dry wipes. 
  • Furthermore, wiping the nose of 5 piglets within a litter resulted in higher litter detection rates than sampling the udder directly. This indicates that within litter prevalence is a driver for IAV detection using wipes. 
  • Future steps are needed to assess differences in virus isolation among sampling procedures.
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Detecting PRRS and influenza A viruses from swine farm air filters

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 are sharing a new publication from Dr. Montse Torremorell’s lab investigating if RNA viruses such as PRRSv and influenza virus could be detected from used filters in commercial swine herds.

Key Points

  • Little is known about the type and nature of viruses that get trapped in commercial filters on swine farms due to a lack of sampling methods.
  • The first part of this study established effective methods for eluting and identifying PRRS and IAV viruses in MERV filters under lab conditions.
  • The second part of the study tested the verified method on used filters from swine farms, verifying the presence of both PRRS and IAV
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