Journal
LETTERS IN APPLIED MICROBIOLOGY
Volume 35, Issue 3, Pages 173-175Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1472-765X.2002.01149.x
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Aims: The aim of this study is to evaluate the AGID serological test for detection of antibodies anti-Mycobacterium paratuberculosis and its possible adoption as diagnostic method in our field conditions. Methods: Bovine serum samples from dairy herds in Rio de Janeiro State, Brazil, were screened for the presence of antibodies against Myco. paratuberculosis using three different ELISA tests. A panel of 48 randomly selected sera were evaluated by an Agarose Gel Immunodiffusion (AGID) test using Protoplasmatic Paratuberculosis Antigen (PPA). AGID results were compared to the standards - the results of the three ELISA tests, and the specificity and sensitivity were calculated. Results: From 48 sera tested for AGID, 14 (29.17%) were positive and 34 (70.83%) were negative. AGID sensitivity was 57% with two false-positive reactions, and specificity was 92.5% with nine false-negative results. The positive predictive value was calculated in 85.7% for a confidence interval of 95%. Significance and Impact of the Study: Due to its low sensitivity and specificity rates, AGID test has shown to be unsatisfactory as a screening diagnostic method for subclinical herd infection, but it can be useful as a confirmatory test for clinical suspect animals.
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