PROBLEM TO BE SOLVED: To provide a method for activating proliferation of type II alveolar epithelial cells by oral ingestion thereby allowing influenza or infectious lung disorder to be cured or alleviated, and to provide a type II alveolar epithelial cell activator drug.SOLUTION: The method for activating proliferation of type II alveolar epithelial cells thereby allowing lung disorder to be cured or alleviated, includes oral ingestion of lactobacillus. A type II alveolar epithelial cell activator is also provided. The lactobacillus is preferably genus Enterococcus, particularly, faecalis species.【課題】経口摂取により、ＩＩ型肺胞上皮細胞の増殖を活性化させ、インフルエンザや感染性の肺障害を治癒あるいは軽減させる方法、およびＩＩ型肺胞上皮細胞活性化剤薬剤の提供。【解決手段】乳酸菌を経口摂取することで、ＩＩ型肺胞上皮細胞の増殖を活性化させ、肺傷害を治癒あるいは軽減させる方法、およびＩＩ型肺胞上皮細胞活性化剤。該乳酸菌としては、Ｅｎｔｅｒｏｃｏｃｃｕｓ属、特に、ｆａｅｃａｌｉｓ種であることが好ましい。【選択図】図１
