肠毒素有两种，即不耐热毒素（heatliabletoxin，LT）和耐热毒素（heatstabletoxin，ST）。
B-mic I-mic I-mic O O O O O B-mic I-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O B-mic I-mic O O B-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O B-mic I-mic O O