常见病原体为流感病毒、副流感病毒、腺病毒等及肺炎链球菌、溶血性链球菌及葡萄球菌等。
O O O O O 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 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 O B-mic I-mic I-mic I-mic O O