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Table 1 Results for IGRA and skin tuberculin tests performed

From: Different lesion distribution in calves orally or intratracheally challenged with Mycobacterium bovis: implications for diagnosis

Group ID IGRA test Skin test
Weeks after challenge Δ (mm) skin thickness Interpretation
0 2 4 8 12 20 PPD-A PPD-B PPD-B–PPD-A SIT CIT
EC 1 N P P P P 1 5 4 P I
2 N P P P P 1 12 11 P P
3 N P P P Na 1 8 7 P P
4 N P P P P 0 9 9 P P
5 N P P P P 2 9 7 P P
OC 6 N N N P P 3 16 13 P P
7 N N N P Nb 9 22 13 P P
8 N N P P Nc P 3 10 7 P P
9 N N P P P P 2 8 6 P P
10 N N P P P P 5 17 12 P P
  1. SIT: Single Intradermal Test, CIT: Comparative Intradermal Test, EC: endotracheally challenged, OC: orally challenged, Δ: increase, A-PPD: avian PPD, B-PPD: bovine PPD, P: positive, I: inconclusive, N: negative.
  2. a IDscreen S/P% = 28.06.
  3. b IDscreen S/P% = 20.17.
  4. c IDscreen S/P% = 22.26.
  5. —: these animals were necropsied 12 weeks after challenge. The remaining three were tested for IGRA once more before being necropsied 20 weeks after challenge.