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
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