HIV SeropositivityCytomegalovirus InfectionsCytomegalovirusHIV SeroprevalenceHIV InfectionsSubstance Abuse, IntravenousMuromegalovirusSexual BehaviorRisk FactorsGanciclovirSeroepidemiologic StudiesAntibodies, ViralCytomegalovirus RetinitisCytomegalovirus VaccinesHerpesviridae InfectionsAntiviral AgentsDNA, ViralFoscarnetImmunoglobulin GPregnancy Complications, InfectiousAntigens, ViralImmediate-Early ProteinsImmunocompetenceVirus ReplicationSerologic TestsImmunoglobulin MViral ProteinsEnzyme-Linked Immunosorbent AssayVirus ActivationKidney TransplantationInfant, NewbornPolymerase Chain ReactionRoseolovirusViral Matrix ProteinsAIDS-Related Opportunistic InfectionsChlamydophila pneumoniaeImmunocompromised HostFibroblastsGastritis, HypertrophicPregnancyAcquired Immunodeficiency SyndromeViral LoadInfectious Disease Transmission, VerticalOpportunistic InfectionsAntibodies, BacterialViremiaChlamydophila InfectionsTransplantation, HomologousGenes, Immediate-EarlySalivary GlandsCells, CulturedFetal DiseasesUrinePrevalenceTime FactorsGene Expression Regulation, ViralComplement Fixation TestsOrgan TransplantationPneumonia, ViralCell LineMice, Inbred BALB CProspective StudiesHerpesvirus 6, HumanRibonucleosidesHIV SeronegativityKiller Cells, NaturalViral Plaque AssayAcyclovirBlood DonorsBone Marrow TransplantationViral Envelope ProteinsImmunosuppressionMolecular Sequence DataOrganophosphonatesInfant, Newborn, DiseasesCytopathogenic Effect, ViralGraft RejectionSpleenHelicobacter pyloriGenes, ViralHelicobacter InfectionsCytosineRetrospective StudiesImmunity, CellularPostoperative ComplicationsCase-Control StudiesVirus LatencyIncidenceInclusion Bodies, ViralNK Cell Lectin-Like Receptor Subfamily ACD8-Positive T-LymphocytesImmunoglobulin APhosphoproteinsTissue DonorsLiver TransplantationSensitivity and SpecificityToxocariasisTransplantationVirologyImmunosuppressive Agents