Infectious disease

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

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

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

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

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

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

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

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

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

components of the immune and lymphatic systems

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

an abnormal reaction to a foreign substance

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

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

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

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