SmallpoxSmallpox VaccineVariola virusDisease OutbreaksVacciniaMonkeypox virusMonkeypoxPoxviridae InfectionsVaccinia virusOrthopoxvirusBiological WarfareVaccinationMass VaccinationFoodborne DiseasesPericarditisPoxviridaeAdverse Drug Reaction Reporting SystemsGastroenteritisImmunization ProgramsSalmonella Food PoisoningEctromelia virusCowpox virusCivil DefensePopulation SurveillanceEctromelia, InfectiousHistory, 20th Century