Anahtar kelimeler: BK-JC virüs, immünsüpresif hasta, gerçek zamanlı polimeraz zincir reaksiyonu SUMMARY Investigation of BK and JC Virus DNA Positivities by Real-Time Polymerase Chain Reaction in Immunosuppressive Patients Aim: This study was aimed to investigate the BK virus (BKV) and JC virus (JCV) DNA by real-time polymerase chain reaction (Real-Time PCR) in immunosuppressive patients with high risk. Materials and Methods: A total of 296 samples obtained from 129 patients hospitalized in Gazi University