Study of the distribution of Malassezia species in patients with pityriasis versicolor and healthy individuals in Tehran, Iran

BMC Family Practice

Sassan Rezaie²  Zahra Hallaji¹  Hojjat Zeraati³  Farshid Saadat⁴  Kamiar Zomorodian²  Farideh Zaini²  Parivash Kordbacheh²  Bita Tarazooie² 

[1] Department of Dermatology, Razi University Hospital, Tehran, Iran;Department of Medical Mycology & Parasitology, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, Iran;Department of Bio-statistics, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, Iran;Department of Immunology, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, Iran

关键词: healthy skin;    Malassezia species;    pityriasis versicolor;   

Others  :  856873
DOI  :  10.1186/1471-5945-4-5

 received in 2003-12-17, accepted in 2004-05-01,  发布年份 2004

【 摘 要 】

Background

Pityriasis versicolor is a superficial infection of the stratum corneum which caused by a group of yeasts formerly named pityrosporium. The taxonomy of these lipophilic yeasts has recently been modified and includes seven species referred as Malassezia. The aim of this study is to compare the distribution of Malassezia species isolated from pityriasis versicolor lesions and those isolated from healthy skins.

Methods

Differentiation of all malassezia species performed using morphological features and physiological test including catalase reaction, Tween assimilation test and splitting of esculin.

Results

In pityriasis versicolor lesions, the most frequently isolated species was M. globosa (53.3%), followed by M. furfur (25.3%), M. sympodialis(9.3%), M. obtusa (8.1%) and M. slooffiae (4.0%). The most frequently isolated species in the skin of healthy individuals were M. globosa, M. sympodialis, M. furfur, M. sloofiae and M. restricta which respectively made up 41.7%, 25.0%, 23.3%, 6.7% and 3.3% of the isolated species.

Conclusions

According to our data, M. globosa was the most prevalent species in the skin of healthy individuals which recovered only in the yeast form. However, the Mycelial form of M. globosa was isolated as the dominant species from pityriasis versicolor lesions. Therefore, the role of predisposing factors in the conversion of this yeast to mycelium and its subsequent involvement in pityriasis versicolor pathogenicity should be considered.

【 授权许可】

   
2004 Tarazooie et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.

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