To make intravenous (IV) ganciclovir available to immunocompromised patients with life-threatening or sight-threatening Cytomegalovirus (CMV) infection, where the symptoms of the disease are too severe to allow admission to a controlled clinical study of ganciclovir therapy. To determine the safety and tolerance of 2 - 3 weeks induction course of ganciclovir IV followed by a maintenance course of ganciclovir IV for an indefinite duration. To tabulate the patient's clinical response.