前者如细菌、钩端螺旋体、分枝杆菌、CMV病毒、Hanta病毒以及多瘤病毒等。
O O O B-mic I-mic O B-mic I-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic 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 O O B-mic I-mic I-mic I-mic O O