An outbreak of mucormycosis in slender tree frogs (Litoria adelensis) and white-lipped tree frogs (Litoria infrafrenata)
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A first case of subcutaneous infection caused by Saksenaea vasiformis in an 11-year-old Thai thalassaemic boy was described. The specific diagnosis of infection was attained from microscopic demonstration of the causal agent as well as the isolation of the fungus. The patient was successfully treated by debridement of the lesion and parenteral amphotericin B. The predisposing factors, source of infection and regimen for treatment are discussed.
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An antigen analysis with filtrate and homogenate precipitinogens of single isolates of the zygomycetes Absidia corymbifera, Mucor pusillus, Rhizopus arrhizus, and Rhizopus oryzae demonstrated the presence of common antigens among the three genera as well as antigens which permit their differentiation. Selected homogenate antigens were valuable in developing a diagnostic immunodiffusion (ID) test for systemic zygomycosis. When sera from 43 patients with various proven mycoses other than zygomycosis were tested against each of the antigens, none formed precipitin bands identical to those formed by A. cormybifera, M. pusillus, and the Rhizopus spp. rabbit reference antisera. Sera from 23 normal persons and 25 diabetics did not react with any of the antigens. Homogenate antigens detected antibody in 8 of the 11 sera (73%) from suspected or proven cases of zygomycosis, whereas ID tests with filtrate antigens detected antibody in only 2 of the 11 sera (18%). Of the eight sera that reacted with the homogenate antigens, five only reacted with a specific Rhizopus sp. antigen, two only reacted with a specific M. pusillus antigen, and one only reacted with a specific A. corymbifera antigen. Study results show the ID test with homogenate antigens to be more specific and sensitive than the ID test with filtrate antigens and indicate that the former is a promising technique for diagnosing human zygomycosis.
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A temporal sequence of characteristic radiographic abnormalities in aspergillosis and mucormysis, two types of opportunistic pneumonia, is presented. The first manifestation is a rounded pneumonia with irregular margins, which slowly increases in size and sometimes in number. Progression to hemorrhagic pulmonary infarction is common. Nonspecific diffuse pneumonia may develop. Hematogenous dissemination to the lungs from a distant source produces a miliary-nodular pattern. In an immunocompromised patient, this sequence of findings should lead to either appropriate diagnostic procedures or empirical institution of antifungal therapy.
Although Zygomycetes cause life-threatening, opportunistic infections in immunocompromised hosts, the first case of vaginitis caused by Mucor species in a healthy woman is reported. Mucor vaginitis, which caused mild symptoms only, was refractory to conventional azole therapy and resistant to flucytosine. Cure was achieved with topical amphotericin B.