infection rates in reactors to an absorbed elisa used in a test and cull program for bovine johne's disease. | to determine the proportion of cattle, whose sera gave positive reactions in a commercial enzyme linked immunosorbent assay (elisa) for bovine johne's disease, that were confirmed infected with mycobacterium avium subsp paratuberculosis by histology and culture of tissues. | 2004 | 15149076 |