Immune System
The body’s defense against infection. It includes cells tissues and organs.
Antibody
A protein that helps fight infection. It recognizes harmful substances.
Antigen
A substance that triggers an immune response. It may be a virus or bacteria.
Inflammation
The body’s reaction to injury or infection. It causes redness heat and swelling.
Vaccine
A substance that helps the body build immunity. It prevents disease.
Allergy
An immune reaction to a harmless substance. Symptoms may include sneezing or rash.
Autoimmune Disease
A condition where the immune system attacks the body. It causes inflammation.
Pathogen
A microorganism that causes disease. It may be viral bacterial or fungal.
Immunity
The body’s ability to resist infection. It may be natural or acquired.
White Blood Cells
Cells that fight infection. They increase during illness.
Lymph Nodes
Small structures that filter harmful substances. They swell during infection.
Inflammatory Response
The body’s reaction to harmful stimuli. It helps protect tissues.
Chronic Inflammation
Long lasting inflammation. It may contribute to disease.
Histamine
A chemical released during allergic reactions. It causes itching and swelling.
T Cell
A type of white blood cell that helps fight infection. It plays a role in immunity.
B Cell
A white blood cell that produces antibodies. It helps defend against infection.
Immune Deficiency
A condition where the immune system is weakened. It increases infection risk.
Exposure
Contact with a harmful substance. It may lead to infection.
Booster
An additional vaccine dose. It strengthens immunity.
Response
The body’s reaction to infection or vaccination. It varies by individual.