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Table 1 Individual information of animals negative in the single intradermal tuberculin (SIT) test using severe and standard interpretations, the interferon-gamma (IFN-γ) assay using two cut-offs (0.05 and 0.1) and negative to both severe SIT and 0.05 IFN-γ tests that were subjected to bacteriology

From: Risk factors associated with negative in-vivodiagnostic results in bovine tuberculosis-infected cattle in Spain

Variable recorded Negative in the SIT test Negative in the IFN-γ assay Negative in both tests
Interpretation/cut-off Severe Standard 0.05 0.1 Severe (SIT)/0.05 (IFN-γ )
Number of animals 3161 3263 1129 1959 927
Median age (years) (IQR) 4.90 (1.73-8.69) 4.82 (1.72-8.65) 4.57 (1.83-8.12) 4.84 (1.85-5.83) 4.84 (1.97-8.47)
Productive type (%) Beef 1776 (56.2) 1862 (57.1) 595 (52.7) 1183 (60.4) 456 (49.2)
Dairy 512 (16.2) 522 (16.0) 324 (28.7) 370 (18.9) 286 (30.9)
Bullfighting 873 (27.6) 879 (26.9) 210 (18.6) 406 (20.7) 185 (20.0)
Number of herd-tests before the animal was culleda (%) 1 1268 (40.1) 1316 (40.3) 260 (23.0) 654 (33.4) 190 (20.5)
2 850 (26.9) 868 (26.6) 306 (27.1) 535 (27.3) 253 (27.3)
3 641 (20.3) 663 (20.3) 387 (34.3) 517 (26.4) 342 (36.9)
> than 3 402 (12.7) 416 (12.7) 176 (15.6) 253 (12.9) 142 (15.3)
Bacteriology result (%) Positive 768 (24.3) 788 (24.1) 146 (12.9) 337 (17.2) 110 (11.9)
Negative 2393 (75.7) 2475 (75.9) 983 (87.1) 1622 (82.8) 817 (88.1)
  1. aSince disclosure of the tuberculosis episode.