Epidemiological characterization of pityriasis versicolor and distribution of Malassezia species among students in Hai Phong city, Vietnam

• मुख्य लेखकों: Bac Nguyen (लेखक), Hien Vo (लेखक), Mai Dinh (लेखक), Thai Vu (लेखक), Thuy Lai (लेखक), Mui Nguyen (लेखक), Anh Bui (लेखक), Khuong Trinh (लेखक), Loi Cao (लेखक), Sang Trieu (लेखक), Dung Le (लेखक), Sa Hoang (लेखक), Anh Le (लेखक), Luc Nguyen Nguyen (लेखक), Do Anh (लेखक)
• स्वरूप: पुस्तक
• प्रकाशित: Mazandaran University of Medical Sciences, 2020-06-01T00:00:00Z.
• विषय: article
• ऑनलाइन पहुंच: Connect to this object online.
• Notes: 2423-3439; 2423-3420; 10.18502/cmm.6.2.2838
• Keywords: hai phong city; malassezia; pityriasis versicolor; students; vietnam; Internal medicine; RC31-1245; Biology (General); QH301-705.5
• Source: Current Medical Mycology, Vol 6, Iss 2, Pp 11-17 (2020)

<strong>Background and Purpose:</strong> Pityriasis versicolor (PV) is a common fungal skin infection caused by Malassezia species. Previous studies have shown that the prevalence of PV is influenced by geographic factors. The aim of the current study was to find the epidemiological characteristics of PV and distribution of Malassezia species in the secondary school students living in Hai Phong city, Vietnam.<br /> <strong>Materials and Methods:</strong> This study was conducted on 1357 students within the age range of 10 - 16 years selected from four secondary schools in Hai Phong city. The students were screened for PV skin lesions from August 2016 to December 2017. The isolates of Malassezia from PV patients were analyzed by performing direct microscopy and culturing on modified Dixon agar plates, containing gentamicin, at 32oC for 7 days. In the next stage, the fungal strains obtained from patients with positive fungal cultures were identified using the CHROMagarTM Malassezia medium, polymerase chain reaction-restriction fragment length polymorphism techniques, and D1/D2 rDNA genome sequencing.<br /> <strong>Results:</strong> Pityriasis versicolor was diagnosed in 305 (22.48%) students and confirmed by clinical appearance and direct examination. A total of 293 (96.07%) samples grew on modified Dixon agar. With regard to demographic characteristics, 50.49% of the PV cases were female, and 57.38% of cases resided in urban areas. Furthermore, 88.52% of the subjects had the illness duration of more than 6 months. Hypopigmented and erythematous skin lesions were also observed in the research participants, with hypopigmentation being the most frequent condition (97.05%). Most of the Malassezia fungal strains were isolated from the back (39.56%), face (23.99%), and chest (16.51%). Malassezia furfur and M. japonica accounted for PV in 96.25% and 3.75% of the cases, respectively. Furthermore, Malassezia furfur was distributed in both rural and urban areas, while M. japonica was found only in the urban areas.<br /> <strong>Conclusion:</strong> The findings of the present study were indicative of the high prevalence of Malassezia yeasts, mostly M. furfur, among the students in Hai Phong city, Vietnam<br /> <strong>for print</strong>