Sariguzel Fatma Mutlu, Koc A Nedret, Yagmur Gülhan, Berk Elife
Department of Microbiology Kayseri Education and Research Hospital Kayseri Turkey Department of Microbiology, Kayseri Education and Research Hospital, Kayseri, Turkey.
Department of Microbiology Erciyes University Medical School Kayseri Turkey Department of Microbiology, Erciyes University Medical School, Kayseri, Turkey.
Braz J Microbiol. 2014 Oct 9;45(3):781-4. doi: 10.1590/s1517-83822014000300003. eCollection 2014.
Interdigital foot infections are mostly caused initially by dermatophytes, yeasts and less frequently by bacteria. Erythrasma caused by Corynebacterium minutissimum can be confused with superficial mycoses. The aim of the study was to determine the prevalence of the etiologic agents of superficial mycoses and the frequency of Corynebacterium minutissimum in interdigital foot infections. All the samples obtained from the 121 patients with interdigital foot infections were examined directly with the use of 20% potassium hydroxide mounts and Gram stain under the microscope and cultured on Sabouraud's dextrose agar plates. In identification of superficial mycoses, the rate was found to be 14% with the cultural method and 14% with direct microscopic examination. Using a combination of direct microscopic examination and culture, a 33.8% ratio was achieved. In the culture of these samples, the most isolated factor was Trichophyton rubrum (33.7%). In 24 of the patients (19.8%) Corynebacterium minutissimum was detected by Gram staining, in 6 of these patients Trichophyton rubrum was found, Trichophyton mentagrophytes was found in 2 and Trichosporon spp. was found in 1. The examination of interdigital foot lesions in the laboratory, the coexistence of erythrasma with dermatophytes and yeast should be considered.
足趾间感染最初大多由皮肤癣菌、酵母菌引起，细菌引起的情况较少。微小棒状杆菌引起的红癣可能会与浅表真菌病相混淆。本研究的目的是确定浅表真菌病病原体的患病率以及微小棒状杆菌在足趾间感染中的出现频率。从121例足趾间感染患者获取的所有样本，直接用20%氢氧化钾涂片并在显微镜下进行革兰氏染色检查，然后接种于沙氏葡萄糖琼脂平板上培养。在浅表真菌病的鉴定中，培养法的检出率为14%，直接显微镜检查的检出率为14%。直接显微镜检查与培养相结合，检出率达到33.8%。在这些样本的培养中，最常分离出的病原体是红色毛癣菌（33.7%）。通过革兰氏染色在24例患者（19.8%）中检测到微小棒状杆菌，其中6例患者同时发现红色毛癣菌，2例发现须癣毛癣菌，1例发现丝孢酵母属。在实验室检查足趾间病变时，应考虑红癣与皮肤癣菌及酵母菌共存的情况。
