Disease - A pathological condition of a part, organ, or system of an organism characterized by an identifiable group of signs or symptoms, Pathogen - An organism or particle that causes disease (viruses, bacteria, etc.), Infectious disease - A contagious disease cause by pathogens (flu, measles, chickenpox, malaria), Noninfectious disease - A disease that is not caused by pathogens and is not contagious (Alzheimer's, cancer), Allergy - An abnormal reaction to a foreign substance, Allergen - A substance that provokes allergies (pollen, mold, dust, certain foods), Acute - Beginning suddenly and lasting for a short time, Chronic - Lasting for a long time and/or recurring frequently (cancer, arthritis, diabetes), Bacteria - Microorganisms which are typically one-celled, have no chlorophyll, multiply by simple division, and can be seen only with a microscope, Virus - A tiny, nonliving particle that can infect cells and cause diseases and cannot be killed with antibiotics, Lymphatic system - A major component of the immune system that protects the body from pathogens, Lymph node - A rounded mass of tissue that filters fluids from other body tissues and traps pathogens, Immunity - The body's ability to protect itself from pathogens before they cause disease, Active immunity - They type of immunity in which the immune system produces antibodies in response to the presence of a pathogen. It can last a few years or up to a lifetime, Passive immunity - A type of immunity acquired when a person receives antibodies from an outside source. It only lasts for a few months, Lymph nodes, adenoids, spleen, bone marrow, lymphatic vessels, tonsils, thymus, appendix - Components of the immune and lymphatic systems, Immune system, lymphatic system, and cardiovascular system - Body systems that work together to defend the body against disease,

Infectious diseases

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