The incidence of Ad infection is >25% for patients at risk in the first 100 days after transplant 1 2. In the transplant population, adenovirus is recoverable from many sites and may cause hemorrhagic cystitis, pneumonitis, nephritis, hepatitis, colitis and pancreatitis, often with severe morbidity and a mortality approaching 60%3. The most frequently used drug for the treatment of adenoviral infections is Cidofovir. But while there are occasional reports of responses to Cidofovir, no approved antiviral agent has proven efficacy for the treatment of severe Ad disease, nor are there any prospective randomized, controlled trials of potentially useful anti-Ad therapies 4. With the increasing use of so-called submyeloablative or reduced intensity, highly immunosuppressive conditioning regimens, higher rates of Ad infections/reactivation have been observed due to prolonged immune suppression. The onset of Ad disease/reactivation has recently been reported to occur at a median of 18 days post-transplant (range -7/>+100) 2.