TVMDL received skin biopsy samples from several bearded dragon lizards with a patchy dermatitis that grossly presents as discolored skin with a crusty surface. Microscopic evaluation showed marked hyperkeratosis and mixed leukocytic infiltrates in the upper dermis (Figure 1). A PAS stain revealed the presence of fungal hyphal elements in the thick surface layer of keratin (Figure 2). The clinical picture and microscopic lesions are typical of dermatitis due to surface infection with the fungus Nannizziopsis vriesii, formerly named Chrysosporium anamorph of Nannizziopsis vriesii (CANV). CANV is spread as a contact infection. Damaged skin, poor husbandry, and/or poorly maintained environments provide an avenue for the infection to initiate. The infection does not resolve spontaneously, but rather requires intervention by a veterinarian.
For more information on tests and services offered by TVMDL, call 979.845.3414 or visit tvmdl.tamu.edu.
