Brady Collins
Porcine reproductive and respiratory syndrome (PRRS) is a disease characterised by abortion, respiratory disease, and increased piglet mortality. The PRRS virus is associated with significant economic losses, estimated at $664 million in the United States alone. Vaccination is a critical tool in the control and stabilisation of PRRS-infected herds. While current vaccines do not provide complete protection or sterilising immunity, they offer partial protection and help reduce the impact of the disease. Modified live virus (MLV) vaccines are commonly used and have been shown to reduce reproductive losses and enhance immunity in pigs. The decision to vaccinate and the choice of vaccine depend on various factors, including the specific farm conditions, the impact of the virus on productivity, and the owner's economic tolerance.
| Characteristics | Values |
|---|---|
| PRRS Virus Characteristics | Causes abortion, respiratory disease, increased piglet mortality, and secondary infections |
| PRRS Vaccine Types | Modified live vaccines (MLV), attenuated vaccines, inactivated vaccines, recombinant porcine IFN-α (rPoIFNα) |
| PRRS Vaccine Benefits | Reduces impact of the disease, cross-protection against strains, reduces economic losses, stabilizes herd, induces immunity |
| PRRS Vaccine Protocols | Emergency vaccination during outbreak, "load, close and homogenize", vaccination of gilts, sows, and piglets |
| PRRS Vaccine Considerations | Proper storage and handling, correct dose, timing, biosecurity measures, herd plan, farm-specific needs |
Explore related products
What You'll Learn
PRRS control and prevention
Porcine reproductive and respiratory syndrome (PRRS) is a costly and challenging disease for the swine industry to manage. The control, elimination, and prevention of PRRS are integral parts of modern swine herd management, especially in breeding herds.
The main objective of PRRS control is to wean a PRRS-negative pig while protecting the herd from new PRRS introductions. This can be achieved through various means, including emergency vaccination of sows during an outbreak, which can induce a basal level of immunity against the virus in all present sows simultaneously. The sooner the vaccination is performed, the lower the proportion of infected sows at the moment of vaccination, as it takes about 3 weeks for immunity to develop. Vaccination is generally considered the easiest and safest way to stabilize a herd, and vaccines such as Ingelvac PRRS® have been shown to provide direct benefits to pigs and producers, including cross-protection against various field strains.
Another critical aspect of PRRS control is gilt introduction, as gilts that are infected during gestation will give birth to infected progeny, becoming a source of infection for the herd. The goal of a PRRS acclimation program is to produce immune non-viremic gilts before introducing them into the breeding herd. This is done by exposing them to the homologous virus circulating in the herd at a young age. Acclimation of PRRS-free gilts is best done through vaccination, with a first vaccination using a live vaccine, followed by serological checks 14 days later to ensure correct vaccination.
Additionally, people can serve as vectors for PRRS, so it is essential to implement biosecurity protocols to prevent the introduction of the virus. All personnel should be trained and aware of potential transmission routes, and protocols such as showering in and wearing farm-specific clothing and boots before entering should be followed.
Finally, other management practices can help control PRRS, such as limiting nurse sow movements at weaning, decreasing piglet handling by farm personnel, and minimizing cross-fostering and needle changes between litters or pens.
How Conjugate Vaccines Stimulate T-Cell Defense
You may want to see also
Explore related products
Emergency vaccination of sows
Vaccination is an essential component of a comprehensive health plan for pigs, and it is important to work with a veterinarian to develop a plan tailored to the specific needs and risks of your farm. When it comes to emergency vaccination of sows, there are several key considerations to keep in mind. Firstly, timing is critical. The goal of emergency vaccination is to induce a basal level of immunity against the virus in all present sows simultaneously. The development of immunity after vaccination takes about three weeks, so the sooner the vaccination is administered, the lower the proportion of infected sows.
Secondly, it is important to use the correct type of vaccine. Emergency vaccination of sows should be performed with modified live (attenuated) PRRSV vaccines. These vaccines have been shown to induce faster and stronger primo-immunization, which is critical in an emergency situation. It is important to note that live vaccines replicate in the animal, resulting in transient viremia, and if applied in late pregnancy, viremic piglets may be born.
Thirdly, it is crucial to ensure proper acclimation of PRRSV-free gilts through vaccination. This involves administering a first vaccination with a live vaccine and then checking gilts serologically 14 days later to ensure correct vaccination. In some cases, revaccination may be necessary after four weeks if the infectious pressure in the farm is high, and at least three weeks before the first insemination.
Additionally, it is important to consider the overall health and management of your herd. Vaccination is most effective when combined with proper diagnosis, biosecurity measures, and herd management practices. Regular veterinary guidance is essential to ensure the success of your vaccination program and the overall health and productivity of your herd.
Finally, it is worth noting that while vaccination is an important tool, it should be combined with other strategies such as deworming to maintain the overall health and productivity of your sows and piglets. By staying organized, choosing appropriate health products, and maintaining clean housing, you can create an optimal environment for your pigs to thrive.
Rabies Vaccination: Vets, Animal Control, and You
You may want to see also
Explore related products
PRRS MLV vaccines
Porcine reproductive and respiratory syndrome (PRRS) is a highly contagious disease that affects pigs worldwide, causing significant economic losses in the pig farming industry. The disease is caused by the PRRS virus (PRRSV), which primarily targets the reproductive and respiratory systems of pigs, compromising their immune responses and leading to vaccine ineffectiveness.
To combat this challenge, researchers have developed and evaluated various PRRS modified live virus (MLV) vaccines. MLV vaccines are created using a modified form of the live virus, which is designed to induce an immune response and protect against the disease. These vaccines are commercially available and have been widely adopted, especially in Asian countries, due to their enhanced protective effectiveness compared to other options.
The Ingelvac PRRS® MLV vaccine, developed by Boehringer Ingelheim, has been extensively studied and proven to provide direct benefits to pigs and producers. It offers cross-protection against multiple field strains of the PRRS virus, helping to minimize production losses. Research conducted by Dr. Daniel Linhares demonstrated that herds using the Ingelvac PRRS® MLV vaccine recovered to pre-break production levels significantly faster and experienced lower piglet losses compared to herds using live-virus inoculation.
Another notable MLV vaccine is Prime Pac PRRS (PP) by MSD Animal Health. In a study, pigs were vaccinated with either Ingelvac PRRS MLV or Prime Pac PRRS, and the results showed that the Prime Pac PRRS-vaccinated groups exhibited a significantly lower ELISA response compared to the Ingelvac group. Additionally, the Prime Pac PRRS groups demonstrated higher IFN-γ-SC levels and lower IL-10 secretion.
While MLV vaccines offer advantages, concerns have been raised about their safety. Some studies have indicated that the vaccine virus can shed and persist in vaccinated hosts, leading to detectable viremia and potential transmission to naïve animals. This highlights the importance of ongoing research and evaluation of these vaccines to ensure their safety and effectiveness in controlling PRRS.
Vaccine Reactions: What Do They Mean?
You may want to see also
Explore related products
PRRS immunisation of gilts
Acclimation of PRRSV-free gilts is best achieved through vaccination. The first vaccination should always be with a live vaccine, and gilts should be checked serologically 2 weeks after vaccination to ensure it has been effective. If the farm has a high infectious pressure, revaccination may be required 4 weeks after the first vaccination and at least 3 weeks before the first insemination. If gilts have been previously infected, a single vaccination with an attenuated vaccine will provide a high level of immunity.
It is important to note that vaccination does not provide full protection against PRRS. Vaccinated pigs may still become infected if exposed to a significantly different strain of the virus. However, existing immunity will help control the infection, reducing its duration and severity. Vaccination can also provide cross-protection against various field strains.
ReproCyc® PRRS EU is a vaccine that can be used during pregnancy and lactation. It is recommended for gilts for protection against PRRSV during pregnancy, with vaccination taking place 2 to 5 weeks before breeding. This vaccine has been shown to reduce piglet mortality during the suckling period.
In summary, PRRS immunisation of gilts is a critical step in managing PRRS outbreaks and stabilising herds. While vaccination does not guarantee full protection, it helps control infections and reduces their impact.
Vaccination Requirements: Flying with Children
You may want to see also
Explore related products
PRRS vaccination of piglets
Vaccination is an important tool to stabilize a herd and minimize economic losses due to porcine reproductive and respiratory syndrome (PRRS). While PRRS can infect pigs of any age, the clinical manifestations are particularly severe in pregnant sows and young piglets. Infected pregnant sows may prematurely farrow, resulting in stillborn, partially autolyzed, or mummified fetuses. Young piglets may exhibit symptoms such as fever, severe dyspnea, anorexia, lethargy, eyelid edema, and notable blue or red discoloration of the ears or hindquarters.
Vaccinating piglets has been controversial for many years. One reason is that vaccinating already infected piglets will be of no use. Therefore, vaccination of piglets should be applied when PRRSV infections take place in a stabilized herd after 6-7 weeks of age. If weaners are infected earlier, the success of vaccination will likely be scarce.
Another consideration for the success of piglet vaccination is the development of immunity, which takes about 3-4 weeks. Therefore, the timing of vaccination is critical, and the sooner it is performed, the better. It is also important to note that live vaccines replicate in the animal, and as a consequence, viremic piglets may be born if the vaccine is applied in late pregnancy.
There are several benefits of vaccinating piglets against PRRS. Vaccination can provide clinical protection against the reproductive form of PRRS, reducing abortions, mummies, and secondary respiratory infections. It can also reduce the duration of viremia and decrease viral shedding, thereby reducing transmission of the infection. Additionally, studies have shown that Ingelvac PRRS® vaccines can provide cross-protection against a variety of field strains.
Overall, while there are some considerations and controversies surrounding piglet vaccination for PRRS, it can be an effective tool to stabilize herds, reduce economic losses, and protect against the severe clinical manifestations of the disease in young piglets.
Who Pays for Vaccine Injury Claims?
You may want to see also
Frequently asked questions
Porcine reproductive and respiratory syndrome (PRRS) is characterised by abortion, respiratory disease, increased piglet mortality and secondary infections.
Vaccination is the easiest and safest way to stabilise a herd. Vaccinated pigs could be infected if confronted with a different PRRS strain, but the existing immunity will control the infection sooner and stronger than if the animal was unvaccinated. Vaccination also helps to minimise production losses due to PRRS.
Modified live vaccines (MLVs) are commonly used to vaccinate against PRRS. MLVs replicate in the host and require a full dose to be advantageous in helping to reduce the viremia and duration of shedding with wild-type PRRS. Ingelvac PRRS® is one such vaccine that has been shown to be effective.
The ideal frequency and interval between PRRS vaccination in sow herds have not been conclusively identified and depend largely on the economic tolerance of the owner. A common PRRS vaccination program involves administering the vaccine in gilts pre-breeding and then again in the sow population one to four times per year, depending on experience and risk tolerance.
