Organ Nakli Alıcılarında Viral Enfeksiyonların Laboratuvar Tanısı ve İzlemi
Özet
Bu çalışma, hematopoietik kök hücre ve solid organ nakli alıcılarında immünsupresyon sonrası gelişen fırsatçı viral enfeksiyonların laboratuvar tanısı ve izlem stratejilerini ele almaktadır. Normal bireylerde hafif seyreden herpes virüsler (HSV, CMV, EBV), polyoma virüsler (BKV), adenovirüsler ve solunum yolu etkenleri, nakil hastalarında organ yetmezliği ve yüksek mortaliteye yol açabilmektedir. Tanı ve izlemde, latent ile aktif enfeksiyonu ayırt edebilen ve viral yük takibine olanak tanıyan kantitatif Polimeraz Zincir Reaksiyonu (PZR) gibi nükleik asit amplifikasyon testleri (NAT) temel klinik araç haline gelmiştir. Nakil öncesi donör ve alıcı serolojik taramaları risk sınıflandırmasını sağlarken, nakil sonrasında seri moleküler izlem sayesinde semptomlar gelişmeden önce preemptif tedavi müdahaleleri yapılabilmektedir. Ancak laboratuvarlar arası ekstraksiyon, standart farklılıkları ve standardizasyon eksikliği, küresel klinik kılavuzların oluşturulmasını zorlaştırmaktadır. Sonuç olarak, optimize edilmiş numune yönetimi ve uluslararası standartlara göre kalibre edilmiş test protokolleri, enfeksiyon kaynaklı morbiditeyi azaltmada kritik öneme sahiptir.
This study reviews the laboratory diagnosis and monitoring strategies for opportunistic viral infections following immunosuppression in hematopoietic stem cell and solid organ transplant recipients. Viral agents such as herpesviruses (HSV, CMV, EBV), polyomaviruses (BKV), adenoviruses, and respiratory pathogens, which cause self-limiting infections in immunocompetent individuals, can lead to graft failure and high mortality in transplant recipients. Quantitative Polymerase Chain Reaction (PCR) and nucleic acid amplification tests (NAT) have become essential clinical tools, distinguishing between latent and active infections while enabling viral load monitoring. Pre-transplant donor and recipient serological screenings provide risk stratification, whereas serial post-transplant molecular monitoring allows for preemptive therapeutic interventions before clinical symptoms develop. However, variations in extraction methods, standard differences, and a general lack of assay standardization across laboratories challenge the establishment of universal clinical guidelines. Consequently, optimized sample management and testing protocols calibrated to international standards are critical to mitigating infection-related morbidity.
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