Modeling the transmission and vaccination strategy for PRRS virus

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, the Science Page is written by Dr. Galvis et al. from the Machado lab at North Carolina State University. They report their results with modeling PRRSv transmission in situations where vaccines can be used as mitigation tools.

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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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Multiple vaccinations: what effect on M. hyopneumoniae infection?

Dr. Betlach and the team from the MycoLab recently published a study in the journal Vaccine, regarding the impact of multiple vaccines against Mycoplasma hyopneumoniae. They assessed bacterial load and protection against infection in gilts.

Highlights

  • Vaccination against M. hyopneumoniae reduced bacterial load in infected gilts.
  • Vaccination of both infected and contact gilts reduced M. hyopneumoniae transmission.
  • Genetic diversity of M. hyopneumoniae was not influenced by vaccination.
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PRRS podcast series: One or two vaccine doses against PRRS?

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.

There are already two episodes in this series. We shared the second episode last week and the first episode the week before. Feel to listen to them if you have not already!

This episode focuses on vaccination strategies against PRRS. What is best? One or two doses?
Drs. Torremorell, Spronk, and Wetzel are talking with Dr. Scott Dee from Pipestone Veterinary Services and Dr. Reid Philips from Boehringer-Ingleheim.

Listen to the podcast (17 minutes)

First Oral Vaccination of Eurasian Wild Boar Against African Swine Fever Virus Genotype II

This research summary is shared by Prof. Sanchez-Vizcaino and his team at the Compultense University of Madrid.

Key points

  • A weakly virulent, non-hemadsorbing ASFV strain was isolated in 2017 from a hunted wild boar in Latvia (Strain ID: Lv17/WB/Rie1) with the potential of being used as a vaccine.
  • Oral vaccination of wild boars with strain Lv17/WB/Rie1 protects animals against a virulent hemadsorbing (ASF genotype II).
  • Contact animals exposed indirectly to the vaccinated animals were also protected against the ASF virulent strain
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