PROBLEM TO BE SOLVED: To provide a material that deactivates vero toxin produced by enterohemorrhagic Escherichia coli, and is useful for prevention, treatment or improvement of symptoms caused by the bacterial infection.SOLUTION: A vero toxin deactivator comprises baicalein as an active ingredient.【課題】腸管出血性大腸菌の産生するベロ毒素を不活性化し、当該菌の感染による症状を予防、治療又は改善するために有用な素材の提供。【解決手段】バイカレインを有効成分とするベロ毒素不活性化剤。【選択図】なし