J M Gwozdz
Gwozdz J, Thompson K, Murray A, Reichel M, Manktelow B, West D. Comparison of three serological tests and an interferon-gamma assay for the diagnosis of paratuberculosis in experimentally infected sheep. Aust Vet J. 2000;78:779-83 pubmed
..The superior performance of the IFN-gamma assay in detecting infected sheep in this small experimental population warrants its further evaluation in a larger population of sheep naturally exposed to M a paratuberculosis. ..