PROBLEM TO BE SOLVED: To find an Oryza sativa-derived component having an infection preventing function such as antibacterial activity or inflammation suppression activity and to provide a novel infection preventive composition and applications thereof.SOLUTION: The infection preventive composition includes any of (A) to (C) below as an effective ingredient. (A) is a protein including an amino acid sequence represented by a specified sequence； (B) is a protein including an amino acid sequence represented by a specified sequence in which one to several amino acids are deleted, substituted or added, and having an infection preventing function； and (C) is a fragment including part of the protein (A) or (B) and having an infection preventing function.【課題】抗菌活性や炎症抑制活性等の感染防御作用を有するイネ由来成分を見出し、新規な感染防御用組成物およびその用途を提供すること。【解決手段】以下の（Ａ）～（Ｃ）のいずれかを有効成分として含有することを特徴とする感染防御用組成物。（Ａ）特定の配列で表されるアミノ酸配列からなるタンパク質（Ｂ）特定の配列で表されるアミノ酸配列において１～数個のアミノ酸が欠失、置換もしくは付加されたアミノ酸配列からなり、かつ感染防御作用を有するタンパク質（Ｃ）前記（Ａ）または（Ｂ）の一部からなり、かつ感染防御作用を有するフラグメント【選択図】なし
