CoughWhooping CoughAntitussive AgentsSuppression, GeneticCapsaicinCitric AcidCodeineReflexRespiratory SoundsExpectorantsTime FactorsBronchitisChronic DiseaseAsthmaBordetella pertussisImmune ToleranceImmunosuppressionCells, CulturedNasal DecongestantsAdministration, InhalationDose-Response Relationship, DrugCommon ColdSignal TransductionRespiratory Tract DiseasesGastroesophageal RefluxGuaifenesinSputumCell Line, TumorBronchial Provocation TestsRespiratory Tract InfectionsMice, Inbred C57BLRespiration DisordersApoptosisRNA, MessengerRepression, PsychologyDown-RegulationT-Lymphocytes, RegulatoryDextromethorphan