M. Cem ERGON, Buğse TUNÇ, Mine DOLUCA DERELİ

Maya mantarlarının identifikasyonunda iki farklı kromojenik besiyerinin karşılaştırılması

Amaç: Kateter, protez kullanımı, uzun süren geniş spektrumlu antibiyotik tedavileri, organ nakli ve immün yetersizlik gibi faktörler invazif Candida enfeksiyonlarında artışa neden olmaktadır. Son yıllarda hızlı maya identifikasyonunu sağlamak amacıyla birçok kromojenik besiyeri geliştirilmiştir. Bu çalışmada maya suşlarının tür düzeyinde tanımlanmasında iki farklı kromojenik besiyeri olan CHROMagar Candida (CHROMagar, Fransa) ile Rosachrom Candida Agar II’nin (Gül Biyoloji Laboratuvarı, Türkiye) performanslarının karşılaştırılması amaçlandı. Gereç ve Yöntem: Çalışmaya, Eylül – Ekim 2015 tarihleri arasında hastanemiz Mikoloji Laboratuvarında çeşitli klinik örneklerden soyutlanan 22 C. glabrata, 16 C. tropicalis, 10 C. albicans, dokuz C. parapsilosis, dört C. kefyr, iki Saprochaete capitata, iki Trichosporon spp., bir C. lusitaniae olmak üzere toplam 66 suş alındı. Suşların her iki kromojenik besiyerindeki koloni morfolojisi ile rengi ve koloni etrafında halenin varlığı, 24. ve 48. saatlerde iki farklı kişi tarafından değerlendirildi. Bulgular: Çalışmaya alınan izolatların tümü her iki kromojenik besiyerinde de ayırt edilebilen koloniler şeklinde iyi üreme gösterdi. C. albicans için 24.-48. saatlerde duyarlılık ve özgüllük değerleri sırası ile CHROMagar Candida için %100 ve Rosachrom Candida için %70-80 ile %94,6-96,4 olarak saptandı. Bu değerler, C. tropicalis izolatlarında sırası ile CHROMagar Candida için %100; Rosachrom Candida için %43,7–50 ve %98-100 idi. Sonuç: CHROMagar Candida, C. albicans, C. tropicalis ve C. glabrata türlerini doğru identifiye etmede gösterdiği yüksek duyarlılık ve özgüllük oranları nedeniyle Candida türlerinin identifikasyonu için uygun bir besiyeri olarak belirlendi. Rosachrom Candida besiyerinin ise, C. albicans identifikasyonunda CHROMagar Candida besiyerine alternatif olarak düşünülebileceği ancak C. tropicalis identifikasyonundaki performansının yeterli olmadığı görüşüne varıldı.

Anahtar Kelimeler:

Maya Mantarı İdentifikasyonu, Kromojenik Besiyeri, Chromagar Candida, Rosachrom Candida

COMPARISON OF TWO CHROMOGENIC MEDIA FOR YEAST IDENTIFICATION

Objective: Usage of catheter, prosthesis, treatment with extended spectrum antibiotics for a long time, organ transplantation and immunodeficiency enhanced invasive Candida infections. Quite a few chromogenic media were developed for rapid identification of yeasts, recently. We aimed to compare performances of CHROMagar Candida (CHROMagar, France) and Rosachrom Candida Agar II (Gül Biyoloji Laboratuvarı, Turkey) for the identification of the yeast species.Material and Method: Totally 66 isolates including 22 C. glabrata, 16 C. tropicalis, 10 C. albicans, nine C. parapsilosis, four C. kefyr, two Saprochaete capitata, two Trichosporon spp., one C. lusitaniae isolated from various clinical specimens between September–October 2015 in Mycology Laboratory of our hospital were included. The colonies of the isolates were evaluated by considering the colony morphology, color and the existence of halo around the colony by two different people after 24 and 48 hours.Results: The isolates grew well on both chromogenic media, and showed clearly distinguished colonies. The sensitivity and specificity values for C. albicans were detected as 100% for CHROMagar Candida; 70-80% and 94.6-96.4% for Rosachrom Candida, at 24 and 48 hours, respectively. These values for C. tropicalis were 100% for CHROMagar Candida; 43.7–50 % and 98-100 % for Rosachrom Candida, respectively. Conclusion: CHROMagar Candida which can identify, C. albicans, C. tropicalis and C. glabrata with high sensitivity and specificity rates was concluded as a reliable medium for identification of Candida species. Rosachrom Candida may be thought to be an alternative to CHROMagar Candida for C. albicans identification but its performance in identification of C. tropicalis was not found sufficient.

Keywords:

Identification of Yeasts, Chromogenic Media, Chromagar Candida, Rosachrom Candida,

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