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Cytomegalovirus (CMV) infection is a major and often deadly complication of haematopoietic stem cell (HSC) transplantation.1 Successful preemptive CMV therapy in transplant patients depends on the availability of sensitive, specific, and timely diagnostic tests for CMV infections.2 The pp65antigenemia assay has been used for this purposewith considerable success but has disadvantages of being time-consuming and labor-intensive.3 Recently,commercial quantitative polymerase chain reaction (PCR) methods based on TaqMan technique have become available and proven to be useful in the diagnosis of microbial infection as well as the determination of viral load.4 In this study, we developed a fluorescent-based quantitative real-time PCR (RT-FQ PCR) assay using TaqMan chemistry for rapid and quantitative detection of CMV DNA and assessed its clinic value for monitoring the reinfection of CMV in patients after HSC transplantion.