eradicationPublic HealthThe permanent elimination of a disease worldwide; smallpox is the only human disease ever eradicated.Learn about this termUnit 04: vaccinationPublic HealthRelated TermsepidemicA disease outbreak affecting a large number of people in a p...pandemicAn epidemic that spreads across multiple countries or contin...miasma theoryThe historical theory that diseases were caused by "bad air"...germ theoryThe theory that microorganisms cause infectious diseases. De...