Article Index | "Caseous Lymphadenitis" | Article Index |
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CASEOUS LYMPHADENITIS |
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Caseous Lymphadenitis (CL) is a chronic contagious disease affecting mainly sheep and goats This disease is also called pseudotuberculosis or often "abscesses," and has been referred to as the curse of the goat industry throughout the world. CL is an infection of goats, caused by Corynebacterium pseudotuberculosis. It is also referred to as "abscesses", because of the peripheral swelling, rupture, and drainage of pus from affected lymph nodes. The prevalence of CL in the commercial goat herds may be as high as 30%. If abscesses affect more than one lymph node, the carcass will be condemned at slaughter. Decreased body weight and milk production also occurs, and reproductive efficiency is often lower when these animals have developed internal abscesses. Clinical Signs:
The enlarged lymph nodes have a very thick wall and are filled with thick greenish pus. The most common lymph nodes affected are mandibular (A in figure 1), prescapular (B), prefermoral (C), and supramammary (D) lymph nodes. Less common is involvement of lymph nodes internally in the chest and abdomen. As the animal gets older, abscesses often develop around the lungs, heart, liver, kidney, and spinal cord. They may cause weight loss, pneumonia, and neuoligical signs.
Pathogenesis:
Diagnosis:
Serologic testing may not be accurate due to the presence of antibodies in previously exposed non-diseased or from cross - reactivity of diagnostic antigens with antibodies against other bacteria.
Treatment:
Eradication:
Vaccination:
The vaccine may cause severe reactions in infected animals, and also interferes with serologic testing for CL.
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About the author: This article appeared in ABGA Boer Goat Magazine Sept/Oct 2001. You can contact Dr. Lionel Dawson at 405-744-8580 or at dlionel@okstate.edu. Thanks to Jack & Anita Mauldin Boer Goats for working together with GoatWorld to bring helpful information to the goat industry. Please visit JackMauldin.com for more helpful and up-to-date information regarding goat health. |
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