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

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

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

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

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

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

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

an abnormal reaction to a foreign substance

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

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

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

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

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