Atypical Dermatophilus congolensis infection in a three-year-old pony.
Dermatophilosis caused by Dermatophilus congolensis causes exudative dermatitis in a variety of species. The infection is generally limited to the cutaneous tissues, where infection is acquired from the environment and bacteria penetrate into keratinized epithelium through epithelial disruption. A 3-year-old pony filly was examined for enlarging mandibular lymph nodes during the preceding 10 months. Biopsy of the node revealed mixed and granulomatous inflammation and thick, filamentous Gram-positive bacteria. Dermatophilus congolensis, confirmed by biochemical testing and sequencing of the ribosomal RNA gene, was cultured from a sample aspirated from the infected site. Dermatophilus congolensis should be considered as a possible etiologic agent associated with lymphadenopathy and granulomatous inflammation in the horse.
Byrne
Barbara A
BA
Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA. bbyrne@ucdavis.edu
Rand
Courtney L
CL
McElliott
Valerie R
VR
Samitz
Eileen M
EM
Brault
Stephanie A
SA
D000192:Actinomycetales / Q000235:genetics / Q000302:isolation & purification*; D000193:Actinomycetales Infections / Q000382:microbiology / Q000662:veterinary*; D000818:Animals; D005260:Female; D006734:Horse Diseases / Q000382:microbiology*; D006736:Horses; D008198:Lymph Nodes / Q000382:microbiology; D012329:RNA, Bacterial / Q000235:genetics; D012335:RNA, Ribosomal / Q000235:genetics
D012329:RNA, Bacterial; D012335:RNA, Ribosomal