IgA is an immune protein that functions to stop invading harmful pathogens from attaching to the wall of the gastrointestinal tract and other parts of the body.

• 免疫系统释放抗体是一种免疫蛋白，能阻止有害病原体黏附在肠胃壁和身体其他部分。作者认为双岐杆菌可增强肠胃黏膜抵抗肠胃感染的能力。