Studies on Arthrospore of Trichophyton rubrum (II)

DOI DOI DOI Open Access
  • MIYAZI Makoto
    The Department of Dermatology, Narashino National Hospital Department of Sanitary Bacteriology, Institute of Food Microbiology, Chiba University.
  • NISHIMURA Kazuko
    Department of Dermatology, School of Medicine, Chiba University.
  • KARIYA Hideo
    Department of Dermatology, School of Medicine, Chiba University.

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Other Title
  • Trichophyton rubrumの分節胞子 (II)
  • Relationship Between the Types of Eruption and the Parasitic Forms of Trichophyton rubrum
  • 皮疹と寄生形態との関係

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The relationship between the types of eruption and the parasitic forms of Trichophyton rubrum was studied. <BR>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. <BR>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. <BR>Type B : Hyphae with septa at intervals of less than 5μ and the width of hyphae less than 5μ. <BR>Type C : Individual arthrospore detached from hyphae, swelled and shaped spherically (some of them occasionally germinated). Its diameter was more than 5μ. <BR>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.<BR>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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