Mortality - The number of deaths in a given time or place.⏎
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.⏎
Immunization - The process of strengthening the body’s defense against a particular infectious agent, often accomplished by receiving a vaccine.⏎