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The two-by-two contingency table used to arrange data to calculate the diagnostic sensitivity of each serological test using bacterial culture of Brucella abortus bv 1 as the gold standard.
| Test result | Culture status |
|---|---|
| - | Positive (infected) |
| Positive | True positive (a) |
| Negative | False negative (b) |
| Total | True positive + false negative (a + b) |
Diagnostic sensitivity = a (a + b)
