MemoryImmunologic MemoryMemory DisordersMemory, Short-TermMemory, Long-TermCD8-Positive T-LymphocytesMemory, EpisodicCD4-Positive T-LymphocytesT-Lymphocyte SubsetsLymphocyte ActivationMental RecallMice, Inbred C57BLAntigens, CD45ImmunophenotypingAntigens, CD27B-LymphocytesMice, TransgenicMaze LearningAdoptive TransferNeuropsychological TestsRetention (Psychology)Recognition (Psychology)Lymphocytic choriomeningitis virusHippocampusFlow CytometryCell DifferentiationT-LymphocytesLymphocytic ChoriomeningitisLearningReceptors, Interleukin-7Receptors, CCR7B-Lymphocyte SubsetsAntigensImmunization, SecondaryLymphocyte CountAssociation LearningListeriosisLymphoid TissueAntibody-Producing CellsInterleukin-15Precursor Cells, T-LymphoidAntibody FormationSpleenInterferon-gammaAmnesiaVerbal LearningTime FactorsL-SelectinMice, Inbred BALB CEpitopes, T-LymphocyteFearMice, KnockoutSpatial BehaviorCognitionInterleukin-7Avoidance LearningParabiosisCell ProliferationListeria monocytogenesConditioning (Psychology)Cells, CulturedCytokinesReaction TimeInterleukin-2Receptors, Antigen, T-CellImmunoglobulin DReceptors, CXCR5DinitrobenzenesImmunizationMagnetic Resonance ImagingCytotoxicity, ImmunologicAgingModels, ImmunologicalT-Lymphocytes, Helper-InducerConditioning, ClassicalAnalysis of VarianceHemocyaninCognition DisordersPichinde virusPsychomotor PerformanceT-Lymphocytes, CytotoxicInterleukin-7 Receptor alpha SubunitBehavior, AnimalBrainTh1 CellsAttentionImmunity, CellularPrefrontal CortexBrain MappingAntigens, CD44LymphopeniaTh2 CellsLymph NodesLymphocyte SubsetsT-Lymphocytes, RegulatoryOvalbuminCuesPalatine TonsilGerminal CenterAmygdala