Germ Theory - A theory in medicine stating that microorganisms are the causative agents of infectious, contagious diseases.⏎
Immunization - The process of strengthening the body’s defense against a particular infectious agent, often accomplished by receiving a vaccine.⏎
Habitat - The specific geographical area or physical environment that is inhabited by an organism or a population of organisms.⏎
Incubation Time - The period of time between exposure to an infectious agent and the appearance of symptoms of the infection or disease it causes.⏎
Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎