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.⏎
Institute of Medicine - An independent, nonprofit organization that works outside of government to provide unbiased and authoritative advice on health and medicine to decision makers and the public.⏎
Immune System - The system of biological structures and processes that protects the body from foreign substances, including pathogens.⏎
Intravenous - The use of veins through which medications and solutions are administered.⏎