这个词是什么意思？
The theory that infectious agents, symbiotic microorganisms, and parasites are normal stimulants for the maturation of the immune system toward a balanced immune response. The theory predicts that lack of such stimulation leads to allergies and AUTOIMMUNE DISEASES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D061148 · MeSH 2026。
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