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According to common belief during the Han dynasty, what would a cluster of calamities, prodigies, and heavenly omens usually portend?
Vector Organisms
Animals like mosquitoes, ticks, and birds that carry and spread pathogens (germs or other infectious agents) in a given area.
Pathogens
Microorganisms, such as bacteria, viruses, fungi, or parasites, that can cause disease or illness in their host.
Geographic Locations
Specific places or areas on Earth's surface identified by their physical and geographic characteristics.
Pandemic
An epidemic of an infectious disease that has spread across a large region, for instance multiple continents or worldwide, affecting a substantial number of people.
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