Blue eye disease

Blue Eye Disease (BED), also known as Infectious Hepatitis and Encephalomyelitis, is a viral infection primarily affecting swine. The disease is characterized by its sudden onset and the distinctive blueish or grayish discoloration of the eyes, from which its name is derived. It is caused by the Porcine rubulavirus, a member of the Paramyxoviridae family. First identified in Mexico in the 1980s, Blue Eye Disease has since been reported in various countries, posing significant economic threats to the swine industry due to its impact on piglet mortality and growth retardation in affected herds.

Symptoms and Diagnosis

The clinical signs of Blue Eye Disease can vary but typically include:

• Respiratory distress
• Neurological symptoms such as tremors, convulsions, and paralysis
• Reproductive failure in sows, including abortions and stillbirths
• Corneal opacity leading to the characteristic blueish appearance of the eyes

Diagnosis of BED is primarily based on the observation of clinical signs, serological tests to detect antibodies against the virus, and PCR (Polymerase Chain Reaction) assays for direct identification of the viral RNA.

Transmission and Prevention

The Porcine rubulavirus is believed to be transmitted through direct contact between infected and susceptible pigs or via contaminated fomites. The virus can also be spread through aerosols, facilitating rapid outbreaks within dense pig populations.

Preventive measures include:

• Strict biosecurity protocols to limit the introduction and spread of the virus
• Quarantine and culling of infected and exposed animals
• Vaccination, where available, to provide immunity to the population

Treatment

There is no specific treatment for Blue Eye Disease. Management of the disease focuses on supportive care to alleviate symptoms and prevent secondary infections. This may include the administration of antibiotics to control bacterial infections secondary to the viral disease and providing supportive nutritional and hydration support to affected animals.

Economic Impact

The economic impact of Blue Eye Disease on the swine industry can be significant, with losses stemming from piglet mortality, decreased growth rates, and increased costs associated with disease management and prevention efforts.

Research and Development

Ongoing research into Blue Eye Disease is focused on understanding the epidemiology of the virus, developing effective vaccines, and improving diagnostic methods to rapidly identify and control outbreaks.