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

• disease

• pathogen

• infectious disease

• non infectious disease

• Allergy

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

• disease

• pathogen

• infectious disease

• non infectious disease

• Allergy

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

• disease

• pathogen

• infectious disease

• non infectious disease

• Allergy

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

• disease

• pathogen

• infectious disease

• noninfectious disease

• Allergy

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

• acute

• chronic

• bacteria

• virus

• lymphatic system

An abnormal reaction to a foreign substance

• disease

• pathogen

• infectious disease

• non infectious disease

• Allergy

a major component of the immune system that protects the body from pathogens

• acute

• chronic

• bacteria

• virus

• lymphatic system

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

• lymph node

• immunity

• active immunity

• passive immunity

• lymph nodes, adenoids, spleen, bone marrow, lymphatic vessels, tonsils, thymus, appendix

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

• acute

• chronic

• bacteria

• virus

• lymphatic system

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

• acute

• chronic

• bacteria

• virus

• lymphatic system