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At the individual animal level, diagnostic test performance is determined by its sensitivity and specificity. The corresponding group-level measures are herd sensitivity and herd specificity. Herd sensitivity and herd specificity are affected by animal-level sensitivity and specificity, as well as the number of animals tested, the prevalence of disease in the group and the number of individual animal positive results (1, 2, 3 etc) used to classify the group as positive. Just as we do for individuals, we also want high sensitivity and high specificity in our group level interpretation.