Öz
Giriş: Yenidoğan yoğun bakım ünitelerindeki (YYBÜ) çok düşük doğum ağırlıklı yenidoğanlarda flukonazol profilaksisi kullanımının mantar enfeksiyonu insidansını büyük ölçüde azalttığı gösterilmiştir. Bununla birlikte, Malassezia’nın lipid bağımlı türlerinden biri olan Malassezia furfur’un neden olduğu artan sayıda yenidoğan fungemisi olgusu bildirilmektedir. Mayalar arasında antifungal direncin varlığı da tedavi başarısızlığına neden olabilir. Bu çalışmanın amacı, hastanemiz YYBÜ’de Malassezia türleri ile deri kolonizasyonu oranını, ilişkili faktörleri ve M. furfur suşlarının antifungal duyarlılıklarını değerlendirmektir.
Gereç ve Yöntem: Bu çalışmaya YYBÜ’de takip edilen 150 yenidoğan dahil edildi. Örnekler hastaneye yatış gününde deri yüzeyinden sürüntü yöntemi ile alınarak mDixon agar besiyerinde bir hafta süreyle kültüre edildi. Malassezia türlerini tanımlamak için geleneksel testler ve MALDI-ToF analizi kullanılmıştır. Antifungal duyarlılık testleri yağ asitleri ve resazurin ile zenginleştirilmiş RPMI-1640 besiyerinde (RPMI++) yapıldı.
Bulgular: Malassezia sp. kolonizasyonu 150 yenidoğanın 50’sinde (%33,3) bulundu. En sık M. furfur izole edilirken (16; %32,0), bunu Malassezia sympodialis (13; %26,0), Malassezia restricta (9; %18,0), Malassezia obtusa (6; %12,0) ve Malassezia globosa (6; %12,0) izlemiştir. Total parenteral beslenme alan 63 yenidoğanın 12’sinde (%19,04) M. furfur kültürü yapılmıştır (p<0,05). Flukonazol almayan yenidoğanların %39,2’sinde Malassezia sp. kolonizasyonu gözlenirken, profilaksi grubundaki bebeklerin sadece %10’unda gözlenmiştir (p<0,05). Flukonazolün M. furfur suşları için 32 µg/ml gibi yüksek bir MIC90 değerine sahip olduğu bulunmuştur.
Sonuç: Mikrobiyoloji laboratuvarlarında Malassezia kültürlerinin sıklıkla yapılmaması nedeniyle Malassezia ile ilişkili enfeksiyonlar maskelenecektir. Yenidoğan yoğun bakım ünitelerinde Malassezia taraması yapılması ve antifungal direncin mevcut olup olmadığının belirlenmesi, tedavi prosedürlerinin oluşturulması sürecinde yardımcı olacaktır.
Anahtar Kelimeler: YYBÜ, Malassezia furfur, flukonazol, direnç
Kaynakça
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