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Updated: Sep 27, 2026

Intradermal Inoculation of Mycobacterium avium in the Mouse Ear
Published on: July 3, 2025
Opportunistic mycobacterial granuloma in a cat associated with a member of the Mycobacterium terrae complex
S M Henderson1, J Baker, R Williams
1Park Veterinary Centre, 256 Cassiobury Drive, Watford, WD17 3PA, UK. S.M.Henderson@bris.ac.uk
Abstract:
An 18-month-old domestic short-haired neutered male cat presented with a nodular dermal thickening on a digit. Biopsy demonstrated pyogranulomatous inflammation with moderately frequent acid-fast bacilli. A member of theMycobacterium terrae complex was isolated. There was no evidence of systemic involvement. Treatment was initiated with enrofloxacin, rifampicin and clarithromycin. After 2 months there was no longer any clinically apparent dermal thickening. Treatment was continued for a further 3 months using enrofloxacin and rifampicin.
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