Best of the 2020 Leman conference: Streptococcus suis

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.

You can find all of the presentations selected from previous conferences on the blog here.

One of the most well liked sessions from the 2020 Allen D. Leman swine conference focused on Streptococcus suis. Three great presenters shared their expertise with this common but challenging swine pathogen:

  • Saying hello to our little friend: Streptococcus suis diagnostics, Matt Sturos
  • Streptococcus suis control and recent field experiences, Matt Allerson
  • Managing S.suis one gene at a time, Maria Jose Clavijo
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Streptococcus suis: predicting pathogenicity with virulence-associated genes?

A recent publication in Porcine Health Management by April Estrada, from the Gebhart lab at the University of Minnesota, proposes new virulence-associated genes to predict the pathogenicity of US Streptococcus suis. This project continues her previous work on the classification of US S. suis strains based on pathotypes.

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The re-emergence of Streptococcus suis: a podcast episode

Podcasts are a perfect way to get caught up with new swine information! We are presenting you the latest episode from “At The Meeting… Honoring Dr. Bob Morrison” in collaboration with SwineCast.

In this new episode, our hosts invited Dr. Maria Clavijo from Iowa State University Veterinary Diagnostic Laboratory and Dr. Adam Schelkopf from Pipestone Services to discuss the various new diagnostic techniques to identify differences in Streptococcus suis strains.

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Antimicrobial resistance in swine respiratory bacterial pathogens in the USA

On this Monday morning, we would like to share with you this article published in Research in Veterinary Science by PhD-candidate Shivdeep Hayer advised by Dr. Julio Alvarez. The peer-reviewed publication is a summary of antimicrobial resistances (AMR) in swine respiratory isolates between 2006 and 2016.

Highlights

  • AMR data for bacterial swine pathogens associated with Swine Respiratory Disease Complex are lacking
  • AMR data on swine bacterial pathogens collected over 11 years in the U.S.A was analyzed for changes in AMR prevalence
  • AMR in S. suis and P. multocida isolates mostly remained low
  • There were statistically significant changes in AMR in A. suis and H. parasuis
  • Use of surrogate breakpoints can lead to different AMR estimates for certain bacteria
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Streptococcus suis strains circulating in the U.S. and their association with pathogenicity

Key Points

  • Streptococcus suis isolates were classified into 20 different serotypes and 58 different Sequence types (ST)s.
  • Serotypes 1 and 1/2 were associated with higher pathogenic frequency, while ST profiles 1 and 28 were associated with higher frequency of pathogenic isolates.
  • The analysis of the association between pathotype, serotype, and ST showed that overall, STs were a better predictor of pathogenicity than serotypes.
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