Serology as an aid to diagnosis: uses and abuses

Authors: Worthington RW
Publication: New Zealand Veterinary Journal, Volume 30, Issue 7, pp 93-97, Jul 1982
Publisher: Taylor and Francis

Animal type: Livestock
Subject Terms: Bacterial, Disease/defect, Infectious disease, Clinical pathology, Diagnostic procedures, Notifiable organisms/exotic disease, Reproduction, Immune system/immunology, Mycobacterial, Wasting disease/disorder, Zoonosis, Public health
Article class: Review Article

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Abstract: The importance of correct interpretation of serological test results, common sources of error and problems associated with tests are discussed. In bovine brucellosis, a disease which is ideally suited to serological diagnosis, foetal contact with infection may cause the calf to be a serologically negative carrier. The immune tolerant animal resulting from foetal contact with virus is a major problem in the serological detection of border disease. In Johnes` disease and to a lesser extent in Brucella ovis and leptospiral infections, problems associated with sensitivity and specificity of the tests are stressed. Serovar specificity, cumbersome test procedures and negative tests in the incubation period cause difficulty in the interpretation of serological test results for leptospirosis. The importance of clinical examination, herd histories and alternative diagnostic procedures is important in all diseases. Wherever possible, flocks or herds should be maintained in specific disease-free state. Selection of stock from accredited herds or flocks is the most certain method of buying non-infected animals.

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