Researchers Created New Marker Virus for PRRSV Control
A novel mutant virus allows for the differentiation of vaccinated pigs from those naturally infected with PRRSV.
Updated on Sept. 24, 2026 in Life Sciences
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Researchers have developed a PRRSV-2 marker virus, designated rGSWW15/N∆93, capable of replicating both in vitro and in vivo. This advancement enables the serological distinction between vaccinated and infected animals, addressing a critical gap in current vaccine efficacy monitoring.
Why it matters
Existing porcine reproductive and respiratory syndrome virus vaccines lack the ability to distinguish vaccinated livestock from those harboring natural infections. This new diagnostic tool provides a vital mechanism for improved disease surveillance and control within the global swine industry.
The study identified the LSDSGRISYTVE amino acid sequence as the target for the C8 monoclonal antibody. Researchers successfully utilized fluorescence-based single-B-cell antibody technology to facilitate this marker development.
The players
Journal of Virology
This is a prominent scientific publication that covers significant research findings in the field of virology.
The details
The team created the rGSWW15/N∆93 mutant by performing targeted deletion of the C-terminal nucleocapsid protein epitope. The resulting virus does not elicit antibodies detectable by the custom competitive ELISA, even while remaining viable for replication in animal hosts.
Timeline
September 24, 2026: The findings were published in the Journal of Virology.
The Big Picture
This development marks a shift in virological control by moving toward DIVA (differentiating infected from vaccinated animals) strategies within the context of the ongoing international surveillance for PRRSV-2. It updates the previously limited diagnostic landscape by providing a precise molecular tool to overcome historical limitations in herd management.
The ability to distinguish between infected and vaccinated pigs will likely improve the accuracy of health certification for global livestock trade. This advancement could lead to more efficient disease eradication programs and reduced economic losses for farmers worldwide.
The takeaway
This marker virus represents a major technical milestone in the effort to manage PRRSV on a global scale. Implementing this diagnostic approach could fundamentally change how veterinarians and producers certify the health of swine populations.
Further reading
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More information
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Source note: This article includes information reported by Journal of Virology.
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