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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.