antigen
Medical/biological term for a substance that triggers an immune response. Used in contexts such as vaccines, allergies, and infectious diseases.
The vaccine contains antigens from the virus.
A blood test checks for specific antigens.
She had an allergic reaction to pollen antigens.
Immune cells react to this antigen and produce antibodies.
This test kit detects the virus's antigen.
The antigen and antibody bind together, triggering an immune response.
antigenic determinant; epitope
qualitative antigen test