Caseous Lymphadenitis in sheep
Caseous Lymphadenitis (CLA) is a chronic bacterial disease affecting sheep and goats worldwide. It's caused by the bacterium Corynebacterium pseudotuberculosis and is known for causing abscesses in lymph nodes and internal organs. This disease is particularly significant in areas with intensive sheep farming practices, leading to economic losses due to culling and carcass condemnation.
Symptoms and Diagnosis of CLA 🩺
Symptoms
CLA is characterized by the formation of abscesses, often appearing as lumps around the head and neck. These abscesses can also occur in the lungs and other internal organs, leading to respiratory distress and chronic weight loss. The pus within these abscesses is highly infectious.
Diagnosis
Diagnosis is typically confirmed by culturing C. pseudotuberculosis from the pus of abscesses. Blood tests can indicate exposure to the bacteria, but they may not always confirm active infection.
Treatment of CLA 💊
Unfortunately, antibiotic treatment is often ineffective due to the bacteria's ability to hide within cells and the fibrous capsule surrounding the abscesses. Lancing abscesses is not recommended as it can spread the infection.
Prevention of CLA 🛡️
Preventive Measures
- Quarantine new animals and inspect them for signs of CLA before introducing them to the flock.
- Maintain strict hygiene during shearing and other handling procedures. Disinfect equipment thoroughly.
- Consider vaccination, especially in areas with high CLA prevalence. While vaccines do not cure infected animals, they can reduce the incidence of new infections.
Preventing CLA is crucial as once it establishes in a flock, it is challenging to eradicate. Regular monitoring and veterinary consultation are recommended to manage and control the disease effectively.