Source:http://linkedlifedata.com/resource/umls/id/C0020963
MSH: The specific failure of a normally responsive individual to make an immune response to a known antigen. It results from previous contact with the antigen by an immunologically immature individual (fetus or neonate) or by an adult exposed to extreme high-dose or low-dose antigen, or by exposure to radiation, antimetabolites, antilymphocytic serum, etc.,NCI: An innate tolerance that prevents the body from attacking native proteins and tissue.,NCI: The failure of the immune system to respond to an antigen that previously caused an immune response.