PRRS virus – PRRSControl

Can PRRSV1 Modified-Live vaccines be effective against PRRSV2?

PRRSControl — Fri, 23 Jan 2026 13:10:57 +0000

Field data from South Korea show that a PRRSV1 modified-live vaccine can reduce piglet mortality and provide cross-protection in herds where PRRSV2 is circulating.

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Early piglet vaccination with UNISTRAIN® PRRS induces similar neutralizing titres than 3-week-old vaccination

PRRSControl — Wed, 16 Jul 2025 08:08:16 +0000

Laia Aguirre and colleagues¹ assessed the levels of Neutralizing Antibodies (NA) induced by two different PRRS1 Modified Live Vaccines (MLVs) when administered at 3 days of age, compared to vaccination at 3 weeks of age.

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Pigs vaccinated with a PRRSV1 MLV developed potent immunity against Japanese PRRSV2 strains

PRRSControl — Wed, 05 Mar 2025 17:15:13 +0000

Recently, Salvador Romero and colleagues, assessed the NA and CMI conferred UNISTRAIN® PRRS (PRRSV1 MLV, HIPRA) against the infection by PRRSV2 Japanese strains.

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Productive and economic impact of two PRRS increased virulence outbreaks within a swine farm in Spain

PRRSControl — Mon, 29 Jul 2024 07:45:41 +0000

In the present study we assessed the productive and economic impact of two outbreaks caused by a PRRS strain of increased virulence on a swine farm in Spain.

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Can PRRSV be transmitted to pigs through the consumption of meat from positive animals?

Enric Marco — Mon, 04 Mar 2024 09:00:23 +0000

Regarding meat transmission of PRRS in the fresh meat market from PRRS positive farms: what protocol do countries follow when slaughtering PRRS positive pigs? And how many pigs that are positive still have the antigen within the glands at age of slaughter of 23 weeks?

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What is the impact of PRRS positivity status on productivity?

PRRSControl — Tue, 13 Feb 2024 08:41:14 +0000

Effect of PRRS positivity on productivity within a large integrated pig production system in Europe.

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Vaccination of piglets against PRRS: why, when, and how

PRRSControl — Wed, 29 Nov 2023 10:23:30 +0000

Control of the disease caused by the PRRS virus remains a source of frustration for all producers and veterinarians. And no wonder! The reasons why controlling the disease is so complex include the need for a multifactorial approach and the fact that no solution alone is exclusive and effective.

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How to identify a highly pathogenic PRRS strain?

Daniel Linhares — Tue, 20 Jun 2023 06:06:55 +0000

How can we distinguish a highly pathogenic PRRS strain from the rest? Is there something different in the genome of these viruses?

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Should we make PRRS negative farm for better productivity compared to PRRS stable status?

Lars Erik Larsen — Mon, 18 Oct 2021 07:33:04 +0000

Is the PRRSv infection reducing the growth performance of pigs? If so, what is the mechanism of growth retardation due to PRRSv infection? Should we make PRRS negative farm for better productivity compared to PRRS stable status? First, I regarded this question to be very easy to answer, but when I started, I realized the opposite especially if the answer should be based on scientific evidence. The negative impact of PRRSV is clearly documented in a range of studies when dealing with acute outbreaks of PRRSV and also in “unstable” herds where the virus may circulate among sows and pre-weaned pigs resulting in reproductive problems and increased pre-weaning disease morbidity and mortality. In some production systems, however, with a stable, seropositive sow herd that wean PRRS virus free piglets, there are still PRRS virus circulating in the nursery and even among the finishers. The impact of PRRSV on productivity and health in the latter situation has not been investigated to the same extent as the acute outbreaks, and therefore it is difficult to give an evidence-based clear answer. Pigs that are infected after weaning may develop respiratory clinical signs due to the direct viral damage of mainly the lungs and […]

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Highly pathogenic PRRS strains

Young Lyoo — Wed, 08 Sep 2021 13:59:57 +0000

There are many HP-PRRSV cases in China and Southeast Asia. And there are highly pathogenic Lena strain outbreaks in eastern Europe. Why are these highly pathogenic PRRS outbreaks localized in some countries? Is there any possibility of these highly pathogenic PRRSV strains occurring in Korea? Can we not detect them in lab tests for some reason? Highly pathogenic PRRS (Porcine Reproductive and Respiratory Syndrome) is characterized by unusual, very high morbidity in affected pigs compared to the traditionally known PRRS. A part from severe febrile reaction, a variety of gross lesions and clinical signs were reported from HP PRRS cases, but there is no single definitive clinical sign(s) and/or gross lesion(s) that are suggested as a conclusive diagnostic measure for HP PRRS. Sudden onset of very high mortality in suckling piglets (up to 100%), nursery pigs (up to 70%), finishers (up to 20%), and breeding sows (up to 10%) was an indicator for the HP PRRS in the Chinese pig herd in late 2000s and even higher mortality in the early 2010s. Because of this unique sudden occurrence of high mortality cases without involvement of any other pathogens, it is not easy for farmers and pig health related personnel to […]

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