Intravenous - The use of veins through which medications and solutions are administered.⏎
Germ Theory - A theory in medicine stating that microorganisms are the causative agents of infectious, contagious diseases.⏎
Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎
Habitat - The specific geographical area or physical environment that is inhabited by an organism or a population of organisms.⏎