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The Veterinary Record, Vol 139, Issue 25, 618-621
Copyright © 1996 by British Veterinary Association
1 Department of Veterinary Pathology, University of Edinburgh, Veterinary Field Station, Easter Bush, Roslin EH25 9RG
2 Scottish Agricultural College's Veterinary Services Dumfries, St Mary's Industrial Estate, Dumfries DG1 1DX
3 Scottish Agricultural College's Veterinary Services Edinburgh, Bush Estate, Penicuik, Edinburgh EH26 0QE
Thirty-two sheep with clinical paratuberculosis and 43 normal, healthy control animals were tested for serum antibodies to Mycobacterium avium subspecies paratuberculosis with the absorbed enzyme-linked immunosorbent assay (ELISA) and agar gel immunodiffusion (AGID) test. All the sheep were necropsied and the diseased cases were categorised as having either multibacillary (‘lepromatous’) or paucibacillary (‘tuberculoid’) intestinal lesions. The ELISA and AGID test were highly sensitive when testing the multibacillary group (86·4 per cent and 100 per cent, respectively) but the sensitivity of the tests in the paucibacillary group was significantly lower (10 to 50 per cent and 30 per cent, respectively). These findings were related to the ELISA optical density readings, with the multibacillary samples having values significantly greater than those of the paucibacillary and control groups, and the optical density values appearing to correlate with the numbers of mycobacteria present in the intestinal lesions. These results indicate both the usefulness of serological testing in the diagnosis of the multibacillary form of paratuberculosis and the difficulty in identifying animals with the paucibacillary form of the disease.
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