an allergie
allergy
Antigen is the medical term meaning foreign substance.
Antigen
When a foreign substance enters the body.
Immune System
The Immune Disorder SLE is and autoimmune disorder.
An antigen is a substance that produces an immune response in the body, typically by binding to specific antibodies or activating immune cells. This immune response is essential for recognizing and eliminating foreign substances such as pathogens.
Antigen
Lymphocytes
An antibody is a substance formed by the body in response to a perceived foreign substance. Antibodies are produced by the immune system to help identify and neutralize potentially harmful invaders, such as bacteria and viruses.
Antigenan·ti·gen/ˈantijən/Noun:A toxin or other foreign substance that induces an immune response in the body, esp. the production of antibodies.
The first defense is nonspecific.