Origin of antigenanti- + -gen
An example of an antigen is a common cold virus which causes the body to make antibodies which help prevent the person from getting sick.
- (immunology) A substance that induces an immune response, usually foreign.
From French antigène, from anti- + gène.
- Another type of test looks for the presence of polymerase chain reaction (PCR) which identifies the specific chemical character of the antigen in its DNA, according to a 2001 study in Veterinary Ophthalmology.
- A person who inherits an A antigen gene from each parent has type A blood; receiving two B antigen genes corresponds with type B blood; and inheriting A and B antigen genes means a person has type AB blood.
- Rh blood incompatibility-Incompatibility between the blood of a mother and her baby due the absence of the Rh antigen in the red blood cells of one and its presence in the red blood cells of the other.
- If a radically different blood type is introduced into the bloodstream, the immune system produces antibodies, proteins that specifically attack and destroy any cell carrying the foreign antigen.
- Inactivated-rabies vaccines are injected, either before or after exposure to the virus, in 1.0-ml. doses containing at least 2.5 IU/ml. of rabies virus antigen.