听力障碍发生率高，脑膜炎球菌、流感嗜血杆菌、肺炎链球菌所致后遗症分别占5.4%、2.7%、7.8%。
B-sym I-sym I-sym I-sym 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 O B-mic I-mic I-mic I-mic I-mic O O O O O O O O O O O O O O O O O O O O O O O