这个词是什么意思？
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.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007108 · MeSH 2026。
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