这个词是什么意思？
A common interstitial lung disease caused by hypersensitivity reactions of PULMONARY ALVEOLI after inhalation of and sensitization to environmental antigens of microbial, animal, or chemical sources. The disease is characterized by lymphocytic alveolitis and granulomatous pneumonitis.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000542 · MeSH 2026。
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