An infectious disease is an illness caused by pathogenic microorganisms such as bacteria, viruses, fungi, or parasites that can be transmitted from one person (or organism) to another.
Related terms
Vector-borne Disease: A vector-borne disease is an infectious disease that is transmitted through organisms like mosquitoes or ticks.
Epidemic: An epidemic refers to the rapid spread of an infectious disease within a specific population during a given period.
Pandemic: A pandemic is an epidemic that has spread over multiple countries or continents, affecting a large number of people.