Fig. 2

Lesion Grades. Photographs of representative grades of Treponeme-associated hoof disease (TAHD). A Interdigital space on foot with no lesions (No lesions, grade 0 Ng0): intact and normal looking coronary, interdigital skin, sole and heel. B Toe of normal length and wear pattern. No overgrowth or deformity evident. C Interdigital space of Grade 1 foot lesions (Yes lesions, grade 1, Yg1): Cutaneous lesions (ulcerative erosions) generally within the interdigital space but may be along coronary band or heel bulb. D Same hoof in C, showing no overgrowth or deformity. E Grade 2 foot lesions (Yes lesions, grade 2, Yg2): Ulceration evident in interdigital space, along coronary band, and medial undermining of the hoof capsule. F Hoof capsule overgrowth and deformity is evident. G Plantar surface of normal hoof with no lesions. H Grade 3 foot lesions (Yes lesions, grade 3, Yg3): Sole ulceration with inflammation/necrosis of the epidermal and dermal lamina, extensive of the interdigital space and coronary band. I Extensive hoof capsule overgrowth is present. J Dorsal and K Plantar aspect of Grade 4 foot lesions (Yes lesions, grade 4, Yg4): Sloughing of the hoof capsule, presence of tissue granulation, necrosis and areas of active inflammation or infection