Skin test results: the cut-offs used for combinations of 72-hour increases in Single Intradermal Comparative Cervical Tuberculin (SICCT) test reactions to bovine and avian tuberculin (mm), where oedema was not present at the injection site. Skin test results: the cut-offs used for combinations of 72-hour increases in Single Intradermal Comparative Cervical Tuberculin (SICCT) test reactions to bovine and avian tuberculin (mm), where oedema was not present at the injection site. Based on the TB64 diagram for England and Scotland issued by the predecessor of APHA in January 2010. The arrows show the direction in which the diagram would be expanded for measurements greater than 7 mm. APHA, Animal and Plant Health Agency A. V. Goodchild et al. Veterinary Record doi:10.1136/vr.102961 Copyright © British Veterinary Association. All rights reserved.