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May Domestic Swine Disease Monitoring Report Now Available

The Swine Health Information Center’s (SHIC) May Domestic Swine Disease Monitoring Report is available.

This month’s Domestic Swine Disease Monitoring Report brings information about the spike in PRRSV case positivity in wean-to-finish sites. Comparing the April PRRSV positivity for finishing sites with previous years’, it was the highest April positivity since 2018. In addition, the PRRSV variant 1C.5.32 had the highest number of detections for any variant in 2025. Together with the original L1C.5 variant, they represented 42% of all the ORF5 sequences recovered from the SDRS participant VDLs. The report includes a bonus page about the new PRRSV nomenclature and its implementation in the SDRS dashboards and BLAST tool. PEDV had increased regional case positivity in sow farms, mainly in Minnesota. As expected, the seasonal spike in influenza A case positivity occurred in April, repeating the trend of increased positivity in the spring season. In the first quarter of 2025, Mycoplasma hyopneumoniae had the lowest number of historical confirmed tissue diagnoses.

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Leman Swine Conference: Vaccination strategies to reduce PRRS virus recombination

Video: Leman Swine Conference: Vaccination strategies to reduce PRRS virus recombination

Dr. Jay Calvert, Research Director with Zoetis, recently spoke to The Pig Site’s Sarah Mikesell at the 2023 Leman Swine Conference in St. Paul, Minnesota, USA, about his conference presentation on porcine reproductive and respiratory syndrome (PRRS) virus recombination.

“The number one problem in PRRS these days from a vaccine point of view is the emergence of new strains of PRRS. Since the beginning, we have had new strains and a lot of diversity,” said Dr. Jay Calvert. “We thought we knew it was all about mutation changes in amino acids and the individual strains over time, but they take on new characteristics.”

With the onset of more common whole genome sequencing and recombination analysis, Dr. Calvert says there is another mechanism, and recombination seems to be a key factor.