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Chromomycosis In Amphibians
Brent R. Whitaker
National Aquarium in Baltimore, Pier 3/501 E. Pratt
Street, Baltimore, MD
Chromomycosis,
or chromoblastomycosis, in amphibians is a systemic or integumentary infection
caused by ubiquitous pigmented fungi normally found in soil, wood, and decayed
vegetation. It is one of the most common and often lethal fungal diseases
affecting amphibians. Infections
originate in skin wounds or the intestinal tract. Pigmented fungi have also
been observed in crickets used as food for captive amphibians, although a
direct correlation with disease has not been shown. Clinical signs in affected
animals are often non-specific and typically include anorexia, weight loss,
ulcerative or granulomatous skin lesions, and distended coelom. A diagnosis is
easily made by finding brown or black hyphae, sclerotic bodies or
chlamydospores in granulomata, which are often disseminated throughout the
animal. Special stains, such as periodic acid shift (PAS), can be used to
detect the presence of these fungi in biopsies, impression smears or
histological specimens, but this is rarely needed as the pigmented fungi are
readily detected in unstained tissues.
To date, treatment of chromomycosis in amphibians has not been
successful. However, the use of antifungal agents such as itraconazole, which
is effective against many fungi including dermatophytes and yeast, should be
investigated.
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