一名5岁女孩因高热、意识模糊而入院，查体发现病孩面色苍白，昏迷，时有惊厥，两瞳孔不等大，呼吸微弱，粪检有脓细胞4个，白细胞数16×109/L，脑脊液正常。常规粪便培养发现有革兰阴性杆菌，无动力。临床诊断为中毒性痢疾。该女孩所感染病原体的主要致病物质是

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