The prospective observational study is to establish a registry database to evaluate the
potential impact of prior treatment with CMX001 on the long-term incidence of specific
events, such as outcomes, late CMV and other Double-stranded DNA virus associated events, s
well as survival rates in subjects previously enrolled in selected clinical studies of
CMX001. Each Registry participant will be followed for a period of approximately 3 years from
their enrollment in the Registry.