Lipid - A broad group of molecules including fats and waxes that are insoluble in water and are an important part of living cells.⏎
Immune System - The system of biological structures and processes that protects the body from foreign substances, including pathogens.⏎
Germ Theory - A theory in medicine stating that microorganisms are the causative agents of infectious, contagious diseases.⏎
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.⏎
Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎