herd immunity
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vaccinevaccinationimmunizationantibodyantigenpathogenvirusbacteriainfectioncontagionepidemicpandemicoutbreaktransmissionspreadthresholdimmunityresistancesusceptibilityexposureinoculationboosterdoseefficacyeffectivenesspublic healthepidemiologyvirologyimmunologyplasmaserologycarrierhostvectorincubationsymptomquarantineisolationsocial distancingmaskhygienesanitizationmortalitymorbiditycaseclusterprevalenceincidenceherdpopulationcommunitysocietyprotectiondefenseshieldingacquired immunityinnate immunityadaptive immunitylymphocyteleukocyteT cellB cellvaccinology