The Correlation of Clinical and Mycological Features of Tinea Corporis / 대한의진균학회지

BACKGROUND: The skin lesion of dermatophytosis is best shown in the lesion of tines corporis. The most common one is an annular lesion with central clearing area. But its size and features are various according to the dermatophytes. OBJECTIVE: The purpose of this study is to evaluate the correlation of clinical and mycological features of tinea corporis. METHODS: The clinical features of 113 patients with tinea corporis from February to April 1998 in Catholic Skin Disease Clinic were evaluated. KOH examination and culture from the lesion were done. And dermatophytes were identified with colony morphology and microscopic findings. RESULTS: The ratio of male to female was about 1.7:1 and showed more prevalence in male. Patients with tinea corporis were the most common in the thirties. Of all 113 patients with tinea corporis, single lesion (75 cases, 66.4%) was the most common. In the size of individual lesion, 40 cases (35.4%) were larger than 10cm. The unexposed area (66.0%) was more frequently affected than exposed area (34.0%) and the most common site was buttock (32.1%). Twenty-eight cases (24.8%) had a history of contact with animals and men that were thought be to infection source. Coexisting dermatophytoses in patients with tinea corporis were noted in 66 cases that had 104 lesions of other dermatophytosis. And they were tinea pedis (34.6%), tinea unguium (33.7%), tinea cruris (15.4%) and tithe.5. From 113 patients with tinea corporis, 77 dermatophytes were isolated. They were composed of Trichophyton(T.) rubrum(67cases), T. mentagrophytes(7 cases) and Microsporum(M.) canis(3cases). In 67 cases with T. rubrum infection, 64 cases had annular type, 48 cases had single lesion and 29 cases had larger than loom in size of lesion. In 7 cases with T. mentagrophytes infection, 6 cases had annular type, 6 cases had one lesion and size of lesion was variable. In 3 cases with M. canis infection, all cases had annular type, 2 cases had single lesion and 2 cases had lesions smaller than 2cm in size. CONCLUSION: There findings suggest that clinical features were characteristic according to its causative dermatophytes.

Mycological features of trichophyton verrucosum isolated in Taegu area / 대한피부과학회지

Trichophyton verrucosum is a worldwide zoophilic dermatophye. The human infection was first reported in t.he South western part of Korea in 1986 and Fas been increasing in Taegu area. Thirty-one strains of T. verrucosum isolated from the patients in Taegu area were investigated for their mycological features. Gross observation on Sabot rauds dextrose agar, microscopic examination by scotch tape method and slide culture or Sabourauds dextrose agar and potato dextrose agar, and hair perforation test were perforn ed at 37C. The averages of the largest dimensions of the colonies were .9mm at 2 weeks and 59mm at 4 weeks. The morphologic features of the colonies were clasified into three types. Eighteen of 31 strains showed flatwhitish, disc-like colonies with suvmerging hyphae, 11 strains had large radiating follows on the center of the colonies, and 2 strains showed colonies having diffuse fine folds on their surfaces with well-defined borders. On microscopic exaniination, many chlamydospores, antlerlive hyphae, oval and clavate microconidia, and rat tail or string bean shaped macroconidia were observed. It seemed that observation on potato dextrose agar during 10 to 14 days af er inoculation was suitable method for microscopic examination of T. verrucosum. All 31 strains showed positive reaction on hair perforation test.