Caseous Lymphadenitis
Caseous lymphadenitis:
Extra information on lymphobacteria bacterial disease.
caused by Corynebacterium ovis
- C. pseudotuberculosis carried on skin of sheep
- Non-nitrate-reducing biotype
- Infection follows tissue trauma such as shearing wounds
- Incubation period 3 months
- Chronic suppurative infection of sheep, goats and occasionally cattle
- Abscessation of superficial and internal lymph nodes if haemtogenous spread occurs
- Caseous abscesses with green colour and onion ring appearance
- Ill thrift and pneumonia may occur
- Condemnation of carcasses and hides
- Infection spread by pus from abscesses, and oculonasal secretions
- Organism survives in environment for several months
- Sandwich ELISA detects circulating antibodies to phospholipase toxin
- Control: importation measures including screening; culling of infected sheep, stict hygiene; inactivated vaccine
- Ulcerative lymphangitis:
- Nitrate reducing biotype
- Disease in horses and cattle
- Infection through skin wounds
- Lymphangitis of lower limbs or abscessation in pectoral region
- Slow onset, usually becomes chronic
- Affected lymphatic vessels swollen and firm with nodules
- Oedema in affected limbs
- Ulcerative nodules exude thick green pus
- Lymphangitis and lymphadenitis in cattle with abscesses as well as coronary band lesions causing lameness
- Antibiotic treatment and topical iodophore shampoo
- May cause myositis