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Mycobacterium nebraskense infection in a dog in Switzerland with disseminated skin lesions


Timm, Katrin; Welle, Monika; Friedel, Ute; Gunn‐Moore, Danièlle; Peterhans, Sophie (2019). Mycobacterium nebraskense infection in a dog in Switzerland with disseminated skin lesions. Veterinary Dermatology, 30(3):262-e80.

Abstract

BACKGROUND: Cutaneous disseminated mycobacteriosis is rare in dogs. To the best of the authors' knowledge, the slowly growing mycobacterial species Mycobacterium nebraskense has not been described before in this species.
OBJECTIVE: Description of clinical features, laboratory analyses and treatment regimen of this unusual case.
ANIMAL: A 9-year-old female-spayed West Highland white terrier dog presented with progressive nodules and ulcerations on both sides of the thorax and the rostral aspect of the chest.
METHODS AND MATERIALS: Investigations involved histopathological examination of skin biopsies (including special stains for fungi, bacteria and mycobacteria), standard and mycobacterial culture (including susceptibility testing), 16S/23S rRNA sequencing and BLAST similarity searching.
RESULTS: Ziehl-Neelsen staining of decontaminated biopsy material revealed acid-fast bacteria morphologically consistent with mycobacteria. Treatment with clarithromycin and marbofloxacin achieved partial resolution. A change in the treatment regimen to pradofloxacin and azithromycin resulted in rapid deterioration of skin lesions. Final healing occurred with the addition of prednisolone at an anti-inflammatory dose. The results of mycobacterial culture and susceptibility testing were received 10 and 12 months, respectively, after the first presentation of the dog. Therapy was stopped after 16 months without recurrence of skin lesions.
CONCLUSIONS AND CLINICAL IMPORTANCE: This case is noteworthy for the description of a new mycobacterial species contributing to disseminated panniculitis in a dog and for the difficulties experienced in the lengthy empirical treatment of slowly growing nontuberculous mycobacterial infections. The addition of prednisolone to induce complete healing raises the question of whether the mycobacterial infection was primary or whether it occurred secondarily to an ongoing sterile panniculitis.

Abstract

BACKGROUND: Cutaneous disseminated mycobacteriosis is rare in dogs. To the best of the authors' knowledge, the slowly growing mycobacterial species Mycobacterium nebraskense has not been described before in this species.
OBJECTIVE: Description of clinical features, laboratory analyses and treatment regimen of this unusual case.
ANIMAL: A 9-year-old female-spayed West Highland white terrier dog presented with progressive nodules and ulcerations on both sides of the thorax and the rostral aspect of the chest.
METHODS AND MATERIALS: Investigations involved histopathological examination of skin biopsies (including special stains for fungi, bacteria and mycobacteria), standard and mycobacterial culture (including susceptibility testing), 16S/23S rRNA sequencing and BLAST similarity searching.
RESULTS: Ziehl-Neelsen staining of decontaminated biopsy material revealed acid-fast bacteria morphologically consistent with mycobacteria. Treatment with clarithromycin and marbofloxacin achieved partial resolution. A change in the treatment regimen to pradofloxacin and azithromycin resulted in rapid deterioration of skin lesions. Final healing occurred with the addition of prednisolone at an anti-inflammatory dose. The results of mycobacterial culture and susceptibility testing were received 10 and 12 months, respectively, after the first presentation of the dog. Therapy was stopped after 16 months without recurrence of skin lesions.
CONCLUSIONS AND CLINICAL IMPORTANCE: This case is noteworthy for the description of a new mycobacterial species contributing to disseminated panniculitis in a dog and for the difficulties experienced in the lengthy empirical treatment of slowly growing nontuberculous mycobacterial infections. The addition of prednisolone to induce complete healing raises the question of whether the mycobacterial infection was primary or whether it occurred secondarily to an ongoing sterile panniculitis.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Institute of Food Safety and Hygiene
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Uncontrolled Keywords:General Veterinary
Language:English
Date:1 June 2019
Deposited On:17 Feb 2020 16:09
Last Modified:17 Feb 2020 16:09
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0959-4493
OA Status:Closed
Publisher DOI:https://doi.org/10.1111/vde.12739
PubMed ID:30883992

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