a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin;
Toxoid is a substance that has been treated to destroy its toxic properties but retains the capacity to stimulate production of antitoxins,used in immunization. 类毒素是经过处理后已消除其毒素特性的一种物质，但仍保留有激发产生抗毒素的能力，用于免疫中。
