Immunocompromised individuals such as transplant recipients and HIV-infected individuals with CD4 counts below 50/μl are also impacted by HCMV infection and this virus is regarded as the most important viral pathogen affecting transplantation, including both solid organ transplant and allogeneic hematopoietic stem cell transplant recipients [1], [32], [33]. This evidence concerns the gene CD4 and cytomegalovirus infection.