DERMATOPHYTOSIS

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Causative Agent(s)

Trichophyton verrucosum is the usual cause of ringworm in cattle, but T mentagrophytes, T equinum, Microsporum gypseum, M. nanum, M. canis, and others have been isolated. Dermatophytosis is most recognized in calves, in which nonpruritic periocular lesions are most characteristic, although generalized skin disease may develop.

Clinical Presentation and Epidemiology

Infection may lead to the development of generalized skin disease. Cows and heifers develop lesions on the chest and limbs, and bulls develop lesions in the dewlap and intermaxillary skin. Lesions are characteristically discrete, scaling patches of hair loss with grey-white crust formation, but some become thickly crusted with suppuration. Dermatophytosis as a herd health problem is more common in the winter and is more commonly recognized in temperate climates.

Diagnostic Considerations

Direct examinations of scale and hairs or skin biopsy are the only two diagnostic tests that can confirm invasion of the skin/hair follicles.

Management and Treatment
  • Treatment involves improvement of husbandry because overcrowding increases disease prevalence.
  • Remove crusts with a brush or clipping lesioned areas will help to debulk the
  • Topical therapy with lime sulphur 1:16 or Enilconazole 1:100 leave-on rinses (Twice-a- week), or natamycin, or thiabendazole
  • Oral griseofulvin administration at 10 mg/kg, 5-10 days
  • lime sulphur 1:16 twice a week
  • Enilconazole 1:100 leave-on rinses (twice a week) Dermatophytosis will self-cure in animals.