pandemicPublic HealthAn epidemic that spreads across multiple countries or continents.Learn about this termUnit 14: climate zoonosisPublic HealthRelated TermsepidemicA disease outbreak affecting a large number of people in a p...eradicationThe permanent elimination of a disease worldwide; smallpox i...miasma theoryThe historical theory that diseases were caused by "bad air"...germ theoryThe theory that microorganisms cause infectious diseases. De...