免疫力是指人的机体识别和排除抗原性异物的功能,即机体区分自己和非己的功能。免疫力已不是单纯指人体抗致病微生物的抵抗力了,使人致病的各种病原体只是抗原性异物的一种,其他如非致病性花粉、药物甚至食物,正常机体内经常出现的衰残细胞以及偶尔突变出现的癌细胞也都属于非 Immunity refers to the function of the human body to identify and exclude antigenic foreign bodies, that is, the function of the body to distinguish itself from its own. Immunity is not simply refers to the resistance of the body against pathogenic microorganisms, pathogens causing pathogenicity is only a kind of antigenic foreign body, other non-pathogenic pollen, drugs and even food, often occur in the normal body Decayed cells and cancer cells that occasionally mutate are also non-cancerous