这个词是什么意思？
An acute hypersensitivity reaction due to exposure to a previously encountered ANTIGEN. The reaction may include rapidly progressing URTICARIA, respiratory distress, vascular collapse, systemic SHOCK, and death.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000707 · MeSH 2026。
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