Germ Theory - A theory in medicine stating that microorganisms are the causative agents of infectious, contagious diseases.⏎
Infectious Disease - A type of illness caused by a pathogenic agent, including viruses, bacteria, fungi, protozoa, parasites, or abnormal proteins known as prions.⏎
Mucous Membrane - The moist linings of body passages and internal cavities involved with absorption and secretion of substances.⏎
Morbidity - The relative occurrence of a disease or a condition that causes illness.⏎
Latent Infection - An infection that is currently not producing or showing any symptoms but has the potential of being reactivated and then manifesting symptoms.⏎