Bacterial InfectionsFeverFever of Unknown OriginCalcitoninImmunoglobulins, IntravenousCefotaximeAnti-Bacterial AgentsROC CurveUrinary Tract InfectionsEmergency Service, HospitalInfant, NewbornProtein PrecursorsProspective StudiesVirus DiseasesImmunoassayRisk AssessmentBiological MarkersFollow-Up StudiesImmunity, InnateVirusesGram-Negative Bacterial InfectionsMice, Inbred C57BLListeriosisLymphocytic ChoriomeningitisRespiratory Tract InfectionsLymphocytic choriomeningitis virusHost-Pathogen InteractionsGram-Positive Bacterial InfectionsNeutrophilsCD8-Positive T-LymphocytesMice, KnockoutBacteriaListeria monocytogenesVirus ReplicationCell LineMice, Inbred BALB CCytokinesInterferon Type ICells, CulturedPneumonia, BacterialLipopolysaccharidesSepsisInterferon-betaStaphylococcus aureusHerpesviridae InfectionsPoly I-COrthomyxoviridae InfectionsInterferon-gammaSignal TransductionDisease SusceptibilityMolecular Sequence DataArenaviridae InfectionsAcute DiseaseMacrophagesRNA Virus InfectionsLungDisease Models, AnimalOpportunistic InfectionsPicornaviridae InfectionsInterferonsToll-Like ReceptorsVirus Physiological PhenomenaEscherichia coli InfectionsInfectionBacterial Infections and MycosesRhinovirusPseudomonas InfectionsAntiviral AgentsStaphylococcal InfectionsSpleenTime FactorsPhagocytosisImmunologic MemoryAntimicrobial Cationic PeptidesInflammationInterferon Regulatory Factor-3Influenza A virusPseudomonas aeruginosa