Aujeszky’s Disease (Infection with the Pseudorabies Virus) in cats

  • Occurrence: very rare
  • Location of illness: General/Whole body
Author: Dr. med. vet. Gisa Löwe | Last modified: 03.12.2025

Aujeszky’s Disease, also known as Pseudorabies, is a viral infection caused by Suid Herpesvirus 1 (SHV-1) that primarily affects pigs but can also infect other animals, such as cats. It is almost always fatal for cats.

The most important facts at a glance

Aujeszky’s disease, also known as pseudorabies, is caused by the Suid Herpesvirus 1 and primarily affects pigs, but can also infect other animal species such as cats. While pigs often show no or only mild symptoms, the infection in cats is rapid and fatal. The virus is transmitted through direct Contact with infected animals or the consumption of infected pork. Infected cats show symptoms such as increased meowing, Erbrechen, salivation, uncoordinated gait, and neurological deficits. The Diagnose is made through clinical symptoms, Anamnese, and laboratory tests, using the PCR method and serological tests. There is no specific treatment; the therapy is usually supportive. The Prognose is very poor, as the disease almost always ends fatally, often within two to three days after the onset of symptoms. For Prävention, cats should not be given raw pork, and Contact with potentially infected animals should be avoided. Regular veterinary check-ups are also important. Research focuses on the development of improved diagnostic tests and vaccines, as well as understanding the transmission routes. Studies on genetic Resistenz and the role of wildlife as a viral reservoir are also important. These approaches are intended to help control the spread of the disease and minimize its impact.

Causes

Aujeszky’s Disease is caused by Suid Herpesvirus 1, which belongs to the Herpesviridae family. This virus is closely related to other herpesviruses that infect various animal species. The virus is capable of causing latent infections, hiding in the host’s nerve cells.

Pigs are the main hosts and reservoirs for the virus. In them, the infection can be subclinical or cause mild symptoms. In other animal species, such as cats, however, the disease usually runs an acute and fatal course. The virus is primarily transmitted through direct Contact with infected animals or contaminated materials.

In cats, infection often occurs through the consumption of infected pork or Contact with infected pigs. After infection, the virus rapidly spreads through the nervous system, causing severe neurological symptoms.

Symptoms

In cats, the symptoms of Aujeszky’s Disease usually appear quickly and severely. The incubation period is only a few days. First signs often include Behavioral changes such as Restlessness and increased meowing.

Soon after, more serious symptoms such as excessive salivation, vomiting, and shortness of breath follow. One of the most characteristic symptoms is intense itching, which causes the cat to injure itself. This itching is so agonizing that it is often referred to as “pseudorabies”.

Neurological symptoms such as muscle tremors, disorientation, seizures, and paralysis are also common. The course of the disease is rapid and usually ends with the death of the cat within a few days.

Diagnosis

The diagnosis of Aujeszky’s Disease in cats is based on a combination of clinical symptoms, medical history, and laboratory tests. Since the symptoms are very characteristic, an experienced veterinarian can often make a presumptive diagnosis based on the clinical picture alone.

To confirm the diagnosis, samples of brain, spinal cord, or other tissues are taken and tested for the presence of the virus. Methods such as Polymerase Chain Reaction (PCR) or virus isolation tests are common procedures to confirm the presence of SHV-1 in tissue.

Serological tests to determine antibodies against the virus can also be performed, but are less useful because the disease progresses so rapidly in cats that the immune system often does not have enough time to produce antibodies before the cat dies.

Therapy

Unfortunately, there is no specific treatment for Aujeszky’s disease in cats. As the disease progresses rapidly and is almost always fatal, treatment is primarily supportive and symptomatic.

Animals showing signs of the disease should be isolated from other animals to prevent the spread of the virus. Supportive measures may include administering fluids to prevent dehydration and pain medication to alleviate suffering.

In some cases, euthanasia may be considered to shorten the animal’s suffering, as the prognosis is very poor and the disease is usually fatal.

Prognosis and follow-up care

The prognosis for cats infected with Aujeszky’s Disease is extremely poor. The disease progresses rapidly and is almost always fatal. Most cats die within two to three days after the onset of the first symptoms.

Since there is no effective treatment and the symptoms are so severe, often the only option is to alleviate the animals’ suffering and, if necessary, make humane decisions to avoid further suffering.

Prevention

To minimize the risk of infection with the Pseudorabies virus in cats, it is important to take preventive measures. One of the most effective methods of prevention is strict control over the cat’s food source. Cats should not be given raw meat from pigs or wild animals, as these can often act as carriers of the virus. Cooking the meat kills the virus and makes it safe for consumption.

Furthermore, it is advisable to avoid the cat’s Contact with potentially infected animals. Especially in rural areas, where the infection rate in wildlife may be higher, care should be taken to ensure that the cat does not go outside unsupervised. This reduces the risk of direct transmission through Contact with infected animals.

Another important aspect of Prävention is regular veterinary check-ups. The veterinarian can detect early signs of a possible infection and take appropriate measures. Educating pet owners about the risks and transmission routes of the pseudorabies virus also plays a crucial role in Prävention. By being aware of and implementing these measures, the risk of infection can be significantly reduced.

Outlook on current research

Aujeszky’s Disease, also known as Pseudorabies, is a viral infection that primarily affects pigs but can also attack other animal species such as cats. The virus is caused by Suid Herpesvirus 1 (SuHV-1). Current research heavily focuses on the development and improvement of diagnostic tests for early detection of the infection. The challenge is that cats often show non-specific symptoms that also occur in other diseases, which complicates the diagnosis.

Another important area of research is the development of vaccines that can protect not only pigs but also other vulnerable animal species such as cats. Current studies focus on the genetic modification of the virus to develop attenuated vaccines that elicit an immune response without triggering the disease itself. These vaccines could help curb the spread of the disease in mixed animal husbandry in the future.

Furthermore, there are research initiatives that deal with the transmission of the virus between different animal species. The goal is to better understand the mechanisms by which the virus is transmitted from pigs to cats. This could help develop preventive measures to control the spread of the disease. Scientists are also investigating the genetic variability of the virus to determine whether certain strains are more aggressive than others or if they prefer specific host animals.

Behavioral research investigates how cats react to an infection with the virus and which symptoms occur most frequently. These studies are crucial for improving the clinical diagnosis of the disease. They also help evaluate the effectiveness of new treatment methods, as there is currently no specific antiviral therapy for cats. The research also aims to develop supportive care protocols that can improve the quality of life for infected cats.

Long-term studies deal with the ecological and economic impact of Aujeszky’s disease, especially in regions where pig farming plays a significant role. By combining epidemiological data with economic models, researchers hope to develop strategies that prevent the outbreak of the disease while minimizing economic losses.

Another promising research approach is the development of genetic resistance to the virus. In pigs, initial progress has already been made, with certain genetic markers identified that are associated with increased resistance to the virus. These findings could also be applied to cats in the future to breed resistant populations.

Finally, there are interdisciplinary research projects that deal with the role of wild animals as reservoirs for the virus. Wild boars are known to carry and spread the virus. Understanding their role in the infection cycle is crucial for developing comprehensive control strategies. This research is often conducted in collaboration with conservation organizations to ensure that measures are in line with the protection of wildlife populations.

In summary, research on Aujeszky’s Disease is multidisciplinary and global, aiming to deepen the understanding of the disease and develop practical solutions for its control and prevention. Advances in genetics, vaccine development, and epidemiological modeling promise to significantly reduce the impact of this disease in the future.

Frequently asked questions (FAQs)

  1. What is Aujeszky’s disease? Aujeszky’s Disease, also known as Pseudorabies, is a viral infection caused by Suid Herpesvirus 1. It primarily affects pigs but can also infect other animals such as cats.

  2. How is the virus transmitted to cats? Cats can become infected through Contact with infected pigs or by consuming infected meat. Direct Contact with body fluids or excretions of infected animals also poses a risk.

  3. What symptoms do infected cats show? Infected cats may show symptoms such as fever, itching, salivation, vomiting, and neurological deficits. The symptoms can be very non-specific and mimic other diseases.

  4. Is there a treatment for Aujeszky’s disease in cats? Currently, there is no specific antiviral treatment for cats. Care is limited to supporting the symptoms and improving the general well-being of affected animals.

  5. Can Aujeszky’s disease be transmitted to humans? No, Aujeszky’s Disease is not dangerous for humans. The virus does not affect humans and therefore poses no risk to human health.

  6. How can the disease be diagnosed in cats? Diagnosis is usually made through clinical observation and the exclusion of other diseases. Laboratory tests can detect the virus, but they are often complex and expensive.

  7. Can cats be vaccinated against Aujeszky’s disease? Currently, there is no approved vaccine for cats. However, research is underway to develop vaccines that could offer protection in the future.

  8. How can I protect my pet from Aujeszky’s disease? Avoid Contact between your cat and wild animals and pigs. Do not feed raw pork and ensure your pet does not consume waste from hunting or slaughterhouses.

  9. Is Aujeszky’s disease widespread in all countries? The disease is widespread worldwide, but the prevalence varies greatly. In some regions, it is controlled by strict biosecurity measures and vaccination programs.

  10. What should I do if I suspect my cat is infected? Contact a veterinarian immediately if you suspect your cat is infected. Early diagnosis and supportive care can help alleviate the animal’s suffering.

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