Ochroconis spp

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Ochroconis spp viewed under light microscopy

Ochroconis spp are an opportunistic fungal infection of dogs with immunocompromised states. They are normally considered a non-dermatophytic fungi that requires underlying dermatopathy to invade the skin[1]. The incidence of these infections is greater in warm and humid climate[2].

Species which are pathogenic include:

  • Ochroconis gallopavum (formerly Dactylaria constricta var. gallopava)[3]

Generalized systemic phaeohyphomycosis has been reported with this fungus and affected dogs usually present with neurological signs[4].

In rare cases, peritonitis may result from immunosuppression-induced systemic phaeohyphomycosis[5].

Thick walled fungal hyphae are usually detected in impression smears from skin lesions. Staining with periodic acid-Schiff's stain is usually confirmatory.

Treatment with generalized phaeohyphomycosis usually requires parenteral amphotericin B or itraconazole but successful responses are rare.

References

  1. Jand SK & Gupta MP (1989) Dermatomycosis in dogs. Mycoses 32(2):104-105
  2. Philpot CM & Berry AP (1984) The normal fungal flora of dogs. A preliminary report. Mycopathologia 87(3):155-157
  3. Caretta G et al (1989) Dermatophytes and keratinophilic fungi in cats and dogs. Mycoses 32(12):620-626
  4. Singh K et al (2006) Fatal systemic phaeohyphomycosis caused by Ochroconis gallopavum in a dog (Canis familaris). Vet Pathol 43(6):988-992
  5. Singh K et al (2006) Fatal systemic phaeohyphomycosis caused by Ochroconis gallopavum in a dog (Canis familaris). Vet Pathol 43(6):988-992