Ulcerative dermatitis of the nasal planum or haired skin of the face, associated with intranuclear inclusion bodies compatible with herpesvirus, was identified in nine cats. Clinically, lesions were ulcerative and crusted, and often persistent. A tenth cat had focal proliferative ulcerative stomatitis, also associated with intranuclear inclusion bodies. Microscopically, there was necrosis and ulceration associated with prominent eosinophilic inflammation. Intranuclear inclusion bodies were noted in all cases, within the surface or adnexal epithelium. Ultrastructural examination of skin from two cats revealed virions morphologically compatible with a herpesvirus. Polymerase chain reaction (PCR) specific for feline herpesvirus 1 on DNA extracted from fresh‐frozen or formalin‐fixed paraffin‐embedded biopsy samples and/or consensus primer PCR with DNA sequencing performed on DNA extracted from formalin‐fixed paraffin‐embedded biopsy samples from seven cats revealed that the virus was indistinguishable from feline herpesvirus 1. PCR was negative in one of eight cats tested.
A 10-week-old Dalmatian puppy was presented for evaluation of plaques and eschars limited to the black-haired markings on the dorsum of the body. The plaques and eschars were of acute onset. Histopathologic evaluation revealed epidermal, adnexal, and vascular necrosis, and subepidermal vesiculation consistent with a full-thickness burn. Because of the history of exposure to direct sunlight, limitation of plaques and eschars to black-haired dorsal skin, histopathology, and lack of another identifying cause, the lesions were attributed to a thermal burn from sunlight.
Dermatitis associated with micro®lariae of a nematode of the superfamily Filarioidea was diagnosed in 10 dogs from the western United States. Clinically, lesions were single or multiple papules and plaques with alopecia, scarring, erythema, ulceration, or crusting. Eight dogs had lesional pruritus. Microscopically, there was perivascular, periglandular, to interstitial in¯ammation, with many eosinophils and/or plasma cells, and scarring aecting the dermis and subcutis. Microgranulomas containing micro®laria were seen in six dogs. Micro®lariae were noted in microgranulomas or free in the dermis or subcutis, but not in vessels. In one case, an adult female nematode emerged from a biopsy sample that was placed in physiologic saline. Study of this nematode revealed that it was a ®larioid of the family Onchocercidae; it was identi®ed as Acanthocheilonema sp. (syn: Dipetalonema). Antigen tests of ®ve dogs were negative for Diro®laria immitis. The Knott tests and/or ®lter tests of nine dogs were negative for micro®lariae. An indirect¯uorescence antibody test of one dog was also negative for D. immitis. One dog was not evaluated for micro®lariae.
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