As for this invention, the cell wall component of the intestinal micrococcus, and the prevention of the bacterial infection symptom and the use in cure it regards. Being the cell wall component of the intestinal micrococcus, < Conversion 1 >And its derivative, and it is selected from the group where those consist of the approved possible salt pharmacy, the cell wall component of the intestinal micrococcus< Selective figure >Figure 1本発明は、腸球菌の細胞壁成分、並びに細菌感染症の予防及び治療法におけるその使用に関する。腸球菌の細胞壁成分であって、【化1】及びその誘導体、並びにそれらの薬学的に許容可能な塩からなる群から選択される、腸球菌の細胞壁成分【選択図】図1