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.
Continue reading “Which wipes are better to detect flu: udder skin or nasal wipes?”

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
Continue reading “Detecting PRRS and influenza A viruses from swine farm air filters”

There is a Need for National Influenza Surveillance in Swine

In today’s post, we would like to highlight the value of flu surveillance in swine as well as to acknowledge the University of Minnesota Veterinary Diagnostic Laboratory (UMN-VDL) as a long-standing and committed contributor to the USDA Voluntary Influenza A Virus (IAV) in Swine Surveillance program. Thanks to this surveillance program, the U.S. swine industry has ample information available for analysis and to support influenza-related research, vaccinology and diagnostics.

The objectives of the USDA Voluntary IAV in Swine Surveillance program are:

  • Monitor genetic evolution of endemic influenza in swine to better understand endemic and emerging influenza virus ecology.
  • Make available influenza isolates for research and to establish an objective database for genetic analysis of these isolates and related information.
  • Select proper isolates for the development of relevant diagnostic reagents, updating diagnostic assays, and vaccine seedstock products.
Continue reading “There is a Need for National Influenza Surveillance in Swine”

Effect of influenza A virus sow vaccination on infection in pigs at weaning: A prospective longitudinal study

Dr. Chamba Pardo and colleagues from the University of Minnesota share results of the implementation of sow vaccination to control influenza infections in pigs at weaning through a special issue article published in Transboundary and Emerging Diseases.

Highlights

  • Sow vaccination against IAV was effective at reducing the number of infected groups of pigs at weaning, and the number of positive nasal swab pools within a group.
  • Both prefarrow or whole herd vaccination protocols, and use of commercial or autogenous inactivated vaccines, yielded significant and similar reduction of IAV infections in pigs at weaning.
  • Sow vaccination can help control IAV infections in pigs at weaning and, thus, minimize transmission to growing pigs and other farms.
Continue reading “Effect of influenza A virus sow vaccination on infection in pigs at weaning: A prospective longitudinal study”

Best of Leman #6: J. Pittman – Control of influenza using custom vaccines in sows: a two-year experience

This is our most popular series 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 previous conferences on the blog here.

Continue reading “Best of Leman #6: J. Pittman – Control of influenza using custom vaccines in sows: a two-year experience”