Biolog微生物自动分析系统建立六种皮肤癣菌的鉴定数据库

Establishment of identification database of six common dermatophytes using Biolog automatic analyzer for microbes

目的 探讨Biolog微生物自动分析系统鉴定皮肤癣菌的应用前景.方法 采用表型及DNA测序的方法,将临床收集的菌株鉴定至种 选取红色毛癣菌、须癣毛癣菌、断发毛癣菌、犬小孢子菌、石膏样小孢子菌和絮状表皮癣菌6种常见皮肤癣菌接种于FF微量板,记录皮肤癣菌对95种不同碳源的利用情况,描述其各自的生长反应谱,建立鉴定数据库.结果 6种皮肤癣菌对一些碳源的利用具有明显的差别,通过是否利用棉子糖可以将须癣毛癣菌、断发毛癣菌同其他4种毛癣菌进行区分 而葵二酸可以区分须癣毛癣菌、断发毛癣菌 通过延胡索酸和琥珀酸可以将红色毛癣菌同石膏样小孢子菌、絮状表皮癣菌和犬小孢子菌进行区分 通过是否利用丙氨酸和苯丙氨酸可以对石膏样小孢子菌进行鉴定.而糊精的利用可以区分絮状表皮癣菌和犬小孢子菌.结论 Biolog微生物鉴定系统采用一种特殊的表型鉴定方法,可以对常见皮肤癣菌进行鉴定.

Objective To investigate the application prospect of Biolog automatic analyzer for microbes in the identification of common dermatophytes. Methods Clinical isolates of dermatophyte were identified to species level based on phenotypes and DNA sequence. The strains of Trichophyton rubrum, Trichophyton mentagrophyte, Trichophyton tonsurans, Microsporum canis, Microsporum gypseum and Epidermophyton floccosum were inoculated into FF microplates, and the utilization of 95 different carbon sources were recorded.The growth and reaction spectrum of these strains were described and identification database was set up. Results There was a great difference in the utilization of carbon sources among different fungal species. The utilization of raffinose could differentiate Trichophyton mentagrophyte and Trichophyton tonsurans from the other four Trichophyton. Sebacic acid could differentiate Trichophyton mentagrophyte from Trichophyton tonsurans.Meanwhile, Trichophyton rubrum could be differentiated from Microsporum gypseum, Epidermophyton floccosum and Microsporum canis by utilization of fumarate and succinate. Microsporum gypseum could be identified by use of alanine and phenylalanine. The utilization of dextrin could distinguish Epidermophyton floccosum from Microsporum canis. Conclusion The Biolog automatic analyzer for microbes has the ability to identify common dermatophytes to species level based on their specific phenotype.