Table 2

Conditional sensitivities of the tests, assessed in 40 infected cattle

TestProportion of infected cattle with a non-negative result to the testConditional sensitivity: mean and 95% CI
SICCTD42*18/4045% (30% to 60%)
IFND3*35/40
(positive results only)
88% (77% to 98%)
(positive results only)
38/40
(positive and inconclusive results)
95% (88% to 100%)
(positive and inconclusive results)
IFND42*34/40
(positive results only)
85% (74% to 96%)
(positive results only)
39/40
(positive and inconclusive results)
98% (93% to 100%)
(positive and inconclusive results)
PPDD3*25/2889% (78% to 100%)
PPDD42*37/3897% (92% to 100%)
MIXD333/4083% (71% to 94%)
MIXD4233/4083% (71% to 94%)
  • CIs were calculated with Excel.

  • *Praud and others.4

  • D3, day 3; D42, day 42; IFN, gamma-interferon test with results interpreted using both PPD and MIX (see table 1); MIX, specific antigens ESAT-6 and CFP-10; PPD, purified protein derivatives; SICCT, single intradermal cervical comparative test.