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A) Black-stained spirochetes in representative tissue sample from patient 2. Dieterle stain, 1000X oil immersion. B) Black-stained spirochetes in bovine digital dermatitis (BDD) tissue sample, Warthin-Faulkner stain, 1000X oil immersion. C) Distinct patches of anti- Borrelia fluorescence in histological section of callus from patient 1, 400X magnification. D) Distinct patches of anti- Borrelia fluorescence in histological section of callus from patient 2, 400X magnification.
