GanciclovirAntiviral AgentsThymidine KinaseCytomegalovirus InfectionsCytomegalovirus RetinitisCytomegalovirusFoscarnetAcyclovirGenetic TherapySimplexvirusGenes, Transgenic, SuicideProdrugsRetinitisPhosphotransferases (Alcohol Group Acceptor)Herpesvirus 1, HumanGenetic VectorsGliosarcomaOrgan TransplantationBystander EffectAIDS-Related Opportunistic InfectionsOrganophosphonatesAdministration, OralAntimetabolitesTransplantation, HomologousViremiaAdenoviridaeCytosineDrug Resistance, ViralRibonucleosidesInjections, IntravenousVitreous BodyOrganophosphorus CompoundsDNA, ViralAcquired Immunodeficiency SyndromeDrug ImplantsBone Marrow TransplantationGene Transfer TechniquesOpportunistic InfectionsDimercaprolTumor Cells, CulturedHerpesvirus 6, HumanTransduction, GeneticPneumonia, ViralTransplantation