Infectious disease

a rounded mass of tissue that filters fluids from other body tissues and traps pathogens

body systems that work together to defend the body against disease.

a pathological condition of a part, organ, or system of an organism characterized by an identifiable group of signs or symptoms

a disease that is not caused by pathogens and is not contagious (Alzheimer's, cancer)

A type of immunity acquired when a person receives antibodies from an outside source. It only lasts for a few months

the body's ability to protect itself from pathogens before they cause disease

a major component of the immune system that protects the body from pathogens a rounded mass of tissue that filters fluids from other body tissues and traps pat

a substance that provokes allergies (pollen, mold, dust, certain foods)

a tiny, nonliving particle that can infect cells and cause diseases and cannot be killed with antibiotics

a contagious disease caused by pathogens (flu, measles, chickenpox, malaria)

an organism or particle that causes disease (viruses, bacteria, etc.)

an abnormal reaction to a foreign substance

lasting for a long time and/or recurring frequently (cancer, arthritis, diabetes)

microorganisms which are typically one-celled, have no chlorophyll, multiply by simple division, and can be seen only with a microscope

components of the immune and lymphatic systems

beginning suddenly and lasting for a short time (colds, flu)

the 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