PRRSV – Page 16 – Swine in Minnesota

Porcine reproductive and respiratory syndrome virus 2 (PRRSV-2) genetic diversity and occurrence of wild type and vaccine-like strains in the United States swine industry

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.

In today’s article, The MSHMP team led by Dr. Corzo, describes PRRSV-2 genetic diversity and occurrence of vaccine-like strains in the U.S. over the course of 10 years.

Updated epidemiological curve of cases associated with the new Lineage 1C RFLP1-4-4 variant

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 Friday the Morrison Swine Health Monitoring Project shares an update on their continued monitoring of PRRSv cases associated with the linage 1C, RFLP 1-4-4 variant.

How many PRRSV variants can we find in a swine farm in a sampling event?

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.

Researchers at the Ohio State University, North Carolina University and the University of Minnesota describe the genetic variability of PRRSV found in swine farms with different production types.

Evaluation of viral RNA extraction methods to detect PRRSV and IAV from used commercial air filters

Today, we are happy to share a new publication! Dr. Nirmala and colleagues from the University of Minnesota report on a viral RNA extraction method that can be used to detect both the porcine reproductive and respiratory syndrome virus (PRRSV) and influenza A virus (IAV) from used farm air filters. This work is published in the Journal of Aerosol Science. Take a look at it!

Highlights

Extracting RNA using TRIzol reagent from filter material ground with liquid nitrogen can be used to detect PRRSV and IAV from air filters.
IAV was detected in more filters than PRRSV, though PRRSV could be detected in used filters from farms with PRRSV negative status at the time of filter removal.
The obtained results shows likely evidence of between farm aerosol spread and the methods derived from this study open up avenues to further investigate regional airborne transmission and risk of virus introduction into farms.

Studies on Heterologous Protection Between Japanese Type 1 and Type 2 Porcine Reproductive and Respiratory Syndrome Virus Isolates

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.

Dr. Iseki and colleagues from the National Institute of Animal Health (NIAH, Japan) present studies on heterologous protection between Japanese type 1 and type 2 porcine reproductive and respiratory syndrome virus (PRRSV) isolates. The level of cross-protection that a type 2-based PRRSV vaccine can confer against various type 1 PRRSV field strains is important because no type 1 PRRSV-based vaccine is commercially available in Japan. Find this work here as an advanced publication of the Journal of Veterinary Medical Science.

Key Points:

This study evaluated the cross-protective immunity between type 1 and type 2 PRRSV isolates in growing pigs.
Immunity induced by the type 1 infection may play a role in reducing viremia caused by the type 2 PRRSV.
The immunity induced by the type 2 may not contribute to cross-protection against the type 1.