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Journal of Clinical Microbiology, October 1998, p. 2970-2972, Vol. 36, No. 10
Institute of Virology1
and
Institute of Veterinary Pathology,3
University of Zürich, Zürich, Switzerland, and
Animal Disease Research Unit, USDA-ARS, and Department of
Veterinary Microbiology and Pathology, Washington State University,
Pullman, Washington2
Received 11 February 1998/Returned for modification 4 June
1998/Accepted 23 June 1998
Until recently, sheep-associated malignant catarrhal fever (SA-MCF)
was diagnosed mainly on the basis of clinical presentation and
histopathological changes. Using clinically diagnosed field cases, we
have evaluated a seminested PCR and a competitive inhibition enzyme-linked immunosorbent assay (CI-ELISA) and compared these assays
in the diagnosis of SA-MCF in cattle with histopathology as a
provisional "gold standard." Samples from 44 cattle with clinical
signs suggestive of SA-MCF were examined by histopathology, PCR, and
CI-ELISA. In addition, samples from healthy cattle were evaluated by
PCR (n = 96) and CI-ELISA (n = 75).
Based on histopathology, 38 of the 44 clinical cases were classified as
SA-MCF positive, 3 were classified as inconclusive, and 3 were
classified as SA-MCF negative. The sensitivity of PCR was 95 to 97%,
whereas the specificity ranged between 94 and 100%. The CI-ELISA
showed a sensitivity of 56 to 87% and a specificity between 91 and
100%. In the field, there is good correlation between the diagnoses of
SA-MCF by histopathology, PCR, and CI-ELISA. These data also confirm
the close association of ovine herpesvirus 2 with SA-MCF in
Switzerland.
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Field Validation of Laboratory Tests for Clinical
Diagnosis of Sheep-Associated Malignant Catarrhal Fever
*
Corresponding author. Mailing address: Virologisches
Institut, Universität Zürich, Winterthurerstr. 266a, 8057 Zürich, Switzerland. Phone: 41-1-635 87 01. Fax: 41-1-635 89 11. E-mail: ma{at}vetvir.unizh.ch.
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