Figure 1. Assay results for the 10 goats meeting the case definition of infection with Mycobacterium avium ss. paratuberculosis. OD — optical density; S/P — for results of the enzyme-linked immunosorbent assay (ELISA) (see text for explanation); squares — ELISA values; diamonds — values for gamma interferon; asterisks — data not available. The circled months are those in which fecal shedding was detected.