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For example: ELISA and AGID are two serological tests for Johne's disease in sheep. Both tests measure antibody levels in serum. Therefore, in an infected animal, the ELISA is more likely to be positive in AGID-positive animals than in AGID-negative animals, so that the sensitivities of the two tests are correlated (not independent). This is illustrated in Table 4.5, where the sensitivities of both tests vary markedly, depending on the result of the other test. In contrast, serological tests such as ELISA and AGID are likely to be less correlated with agent-detection tests, such as faecal culture.