<qa>  What is the goal of the protocol?This protocol aims to assess the efficiency of treatment by injection of donor CD4 and CD8 T cells specifically directed against cytomegalovirus or adenovirus, to patients receiving allogenic transplant with infection of one of these two viruses, and in conventional antiviral treatment failure. Donor memory T cells will be obtained from an aphaeresis of mononuclear cells and will be selected on the basis of their ability to produce interferon-gamma IFN-g after stimulation with viral peptides. The speed 48 hours and the reproducibility of this method let hope a better feasibility for clinical use compared to previously developed technologies. Given epidemiology different after allogenic transplant of HSC of these two viruses, and the relative low expected number of patients with adenovirus infection, statistical analysis will focus exclusively on patients who received T cells for CMV infection. The study of efficiency and tolerance of this adoptive immunotherapy for adenovirus will be considered as a secondary purpose. 