Dermatophytosis in farmed mink (Mustela vison) caused by Trichophyton equinum.

This report details 2 outbreaks of dermatophytosis in 2 different mink ranches. On the first farm, only kits were affected, while on the second farm, small numbers of adults were infected. Affected mink were otherwise clinically healthy and in good body condition. Three animals were euthanized and submitted for autopsy. Grossly, mink exhibited locally extensive to coalescing areas of crusting alopecia but no other significant gross lesions in internal organs. Microscopically, skin lesions were characterized by chronic hyperplastic dermatitis with folliculitis, furunculosis, occasional intracorneal pustules, and large numbers of intrafollicular fungal arthrospores and hyphae. The dermatophyte was cultured and identified as Trichophyton equinum based on molecular barcoding of the internal transcribed spacer region of the ribosomal DNA gene.

Cutaneous Phaeohyphomycosis Caused by Exophiala attenuata in a Domestic Cat.

A 7-year-old female-spayed, domestic short-haired cat was presented to her veterinarian with a mass on the hind paw. Histopathologic examination of a tissue biopsy revealed nodular pyogranulomatous panniculitis with intralesional pigmented fungal hyphae. A dematiaceous fungal isolate was isolated with a micromorphological phenotype consistent with the anamorphic genus Exophiala: budding cells, torulose mycelium and annellidic conidiogenesis from simple conidiophores consisting of terminal and lateral cells that tapered to a short beak at the apex. Sequence homology of the internal transcribed spacer region of the rDNA gene confirmed the identification of the isolate as Exophiala attenuata. Reported here is the first confirmed case of feline phaeohyphomycosis caused by E. attenuata in North America. Similar to historical cases of feline phaeohyphomycosis caused by Exophiala spp., there was no history or postmortem evidence to suggest the patient was in an immunocompromised state (e.g., suffering from FeLV or FIV). Although aggressive surgical excision of local lesions is recommended prior to drug treatment when dealing with subcutaneous phaeohyphomycosis, surgery followed by itraconazole treatment did not resolve the E. attenuata infection in this cat.

Isolation of Streptococcus suis from 2 lambs with a history of lameness.

Streptococcus suis was isolated postmortem from 2 lambs with a history of lameness. Identity of S. suis was confirmed by species-specific polymerase chain reaction (PCR) and by 16S rRNA gene sequencing. One isolate was untypable by serotyping and non-encapsulated, while the other isolate was serotype 33. The lambs had come from the same farm, and there was no evidence of contact between the lambs and pigs. Although the natural niche for S. suis is considered to be the pig, a wide range of host species may be affected by this pathogen.

Isolement deStreptococcus suischez 2 agneaux avec une anamnèse de boiterie.Streptococcus suis a été isolé post-mortem chez 2 agneaux avec une anamnèse de boiterie. L'identité de S. suis a été confirmée par une amplification en chaîne par la polymérase (ACP) et par le séquençage génétique de l'ARNr 16S. Un isolat n'a pas pu être typé par sérotypage et était non encapsulé, tandis que l'autre isolat était de sérotype 33. Les agneaux provenaient de la même ferme et il n'y avait aucune preuve de contact entre les agneaux et les porcs. Même si le créneau naturel de S. suis est considéré comme étant le porc, un vaste éventail d'espèces hôtes peuvent être affectées par cet agent pathogène.(Traduit par Isabelle Vallières).

Update on antimicrobial susceptibilities of bacterial isolates from canine and feline otitis externa.

The in vitro susceptibility of a total of 1819 bacterial isolates from canine and 103 isolates from feline otitis externa cases to 13 antimicrobial drugs over a 5-year period was evaluated. Among topically used drugs, 90% of isolates were susceptible to gentamicin. Susceptibility of Pseudomonas aeruginosa to gentamicin was 85%, and to polymyxin B 100%. For isolates other than the Pseudomonas sp., susceptibility was highest to amoxicillin-clavulanic acid.