The relationship between the types of eruption and the parasitic forms of Trichophyton rubrum was studied.
Parasitic forms were observed by the direct microscopic examination. Materials were obtained from the patients' scraped specimen of erythema, papule, scale or the nail and were examined in 20% potassium hydroxide. The roof of vesicle or pustule was cut off by scissors and was examined in 20% potassium hydroxide.
According to the formation of arthrospore, the parasitic forms of Trichophyton rubrum were classified into three types (Type A, B and C). Type A : Hyphae without remarkable septum and with septa, if found, at intervals of more than 5μ.
Type B : Hyphae with septa at intervals of less than 5μ and the width of hyphae less than 5μ.
Type C : Individual arthrospore detached from hyphae, swelled and shaped spherically (some of them occasionally germinated). Its diameter was more than 5μ.
The relationship between the types of eruption and the parasitic forms was as follows : The lesions of erythema, papule and scale were occupied by 81.6% type A, 18.4% type B and none type C. The lesions of vesicule were occupied by 53.3% type A, 46.7% type B and non type C, while the lesions of pustule by 33.3% type B, 66.7% type C and none type A. The white-macerated-soggy lesions carried 7.7% type A, 76.9% type B and 15.4% type C. While tinea unguium 50.0 % type A, 10.0% type B and 40.0% typeC.
The lesions that appear erythema, papule and scale are dry, whereas the lesions that appear vesicle, pustule, and white-macerated-soggy condition are moist. The hyphae in these moist lesions contact immediately with serous, mucinous, fibrinous, purulent or sanguinous exudate. Regarding to the parasitic forms in the lesions, type B and C were much frequently observed in the moist lesions than in the dry lesions. The swollen spherical cells (type C) were found in 8 of 79 cases, namely 2 in the lesions of pustule, and 2 in the white-macerated-soggy condition, and 4 in tinea unguium.
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