Acute DiseaseCritical IllnessVirus DiseasesConvalescenceSystemic Inflammatory Response SyndromeSeverity of Illness IndexRespiratory Tract InfectionsProspective StudiesFeverHospitalizationChronic DiseaseHomes for the AgedGastroenteritisTime FactorsInfant, NewbornIntensive Care UnitsDisease OutbreaksRetrospective StudiesUnited StatesCohort StudiesRisk FactorsVirusesLength of StayHospital MortalityIncidenceFamily PracticeLymphocytic ChoriomeningitisLymphocytic choriomeningitis virusFollow-Up StudiesAge FactorsTreatment OutcomeCost of IllnessPrognosisRisk AssessmentVirus ReplicationCD8-Positive T-LymphocytesArenaviridae InfectionsRNA Virus InfectionsMice, Inbred C57BLImmunity, InnateInfluenza, HumanHerpesviridae InfectionsInterferon Type IVirus Physiological PhenomenaAntiviral AgentsPoly I-CMental DisordersRhinovirusAdenoviridae InfectionsCell LineInterferon-betaAntibodies, ViralPicornaviridae InfectionsInterferonsIllness BehaviorHost-Pathogen InteractionsRNA, Double-StrandedInfluenza A virusMuromegalovirusViral ProteinsOrthomyxoviridae InfectionsSendai virusRNA, ViralParamyxoviridae InfectionsVacciniaRespirovirus InfectionsAntigens, ViralToll-Like Receptor 3Central Nervous System Viral DiseasesHerpes SimplexImmunologic MemoryInterferon Regulatory Factor-3Cytomegalovirus InfectionsCoxsackievirus InfectionsRhabdoviridae InfectionsMolecular Sequence DataCells, CulturedCommon ColdMice, Inbred BALB CDNA, ViralInterferon-alphaRespiratory Syncytial Virus InfectionsMice, KnockoutInfluenza A Virus, H1N1 SubtypeCytomegalovirusCytokinesOrthomyxoviridaeRespiratory Syncytial VirusesGene Expression Regulation, ViralInterferon-gammaEncephalitis, ViralPneumonia, ViralRNA VirusesEnterovirus InfectionsDNA Virus InfectionsKiller Cells, NaturalBacterial InfectionsDendritic CellsCD4-Positive T-LymphocytesHerpesvirus 1, Human