PROBLEM TO BE SOLVED: To provide a medicine effective for controlling Staphylococcus aureus having antibiotic resistance and antibiotic sensitivity.SOLUTION: Delphinidin or a salt thereof that is a kind of anthocyanidin and expressed by the following formula, which is effective for treating a subject such as a body of animal, a food product, an animal feed or the like, which are contaminated by the antibiotic resistant Staphylococcus aureus. Water solubility and stability are improved by complexing with sulfobutyl ether-β-cyclo dextrin. A treatment method by preventing destruction of mold, decomposition, inactivation, copying or biofilm formation from occurring. R,R,Rand Rto Rare OH； Ris H.SELECTED DRAWING: None【課題】抗生物質耐性及び抗生物質感受性の黄色ブドウ球菌の制御に有効な薬剤の提供。【解決手段】抗生物質耐性黄色ブドウ球菌に汚染された動物の体、食品、飼料等の対象を処置するのに有効な、アントシアニジンの一種である下式で示されるデルフィニジン又はその塩。スルホブチルエーテル－β－シクロデキストリンとの複合化により水溶性、安定性が向上。黄色ブドウ菌の破壊、分解、不活性化、複製の防止又はバイオフィルム形成の防止による対処方法。［Ｒ3、Ｒ5、Ｒ7及びＲ3'～Ｒ5'はＯＨ；Ｒ6はＨ］【選択図】なし
