Skin test-active substance prepared from culture filtrate of Fonsecaea pedrosoi.
Ethanol-precipitated substance (EP) was prepared from culture filtrate of Fonsecaea pedrosoi. EP was separated into two components by passing through a Sephadex G-50 column; the faster passing component was referred to as EP-1, the slower as EP-2. EP-1 and EP-2 were evaluated as an antigen for detecting cutaneous delayed hypersensitivity in patients with chromomycosis. EP-1 elicited positive delayed skin reactions in all of 8 patients with chromomycosis, of which 7 caused by F. pedrosoi and one by Exophiala jeunselmei. Healthy subjects, patients with sporotrichosis and patients with tinea barbae failed to react to EP-1. These results indicate that EP-1 is a useful tool for detecting cutaneous delayed hypersensitivity in patients with chromomycosis caused by F. pedrosoi. It was found that precipitin test using EP-1 as an antigen had little diagnostic value in chromomycosis. EP-2 did not show antigenic activity in both skin and precipitin reactions.
D000328:Adult; D000368:Aged; D000946:Antigens, Fungal / Q000276:immunology*; D002862:Chromoblastomycosis / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D003904:Mitosporic Fungi / Q000276:immunology*; D011233:Precipitin Tests; D012882:Skin Tests
D000946:Antigens, Fungal