The ability of an antigen or vaccine to stimulate immune responses.
The properties of a virus, compound or recombinant protein that provokes an immune response when injected into a human body. This undesirable reaction demonstrates that this protein is sufficiently different to the human to be recognized as a foreign body and rejected by the Immune system.
The ability of a vaccine to stimulate the immune system, as measured by the proportion of individuals who produce specific antibody or T cells, or the amount of antibody produced
The property of being able to evoke an immune response within an organism; it depends partly on the size of the size and complexity of the substance (antigen) in question and partly on how unlike the substance is in comparison to the host's molecules (self-antigens).