Dermatophytosis

Etiology:  Trichophyton mentagrophytes is the most common isolate; Microsporum canis is occasionally recovered.

Incidence:  Incidence of infection is occasional.

Transmission: Transmission occurs by direct contact.

Incidence:  There is a high incidence of the carrier state, with low incidence of disease.

Clinical Signs:  A crusty, pruritic, patchy alopecia on the head which spreads to the paws and other parts of the body is typical (see photo).  Secondary bacterial infections are common.

Diagnosis:  Perform skin scrapings from the periphery of lesions cleared in 10% KOH to examine for arthrospores.  Inoculate DTM agar and characterize hyphae.  Use silver or PAS stains to look for arthrospores in section.

Public Health Significance:  Rabbits can transmit the disease to humans.