The infant happens the most easily and more serious, coccus of pneumococcus of particularly easy infection, meningitis, coliform organisms, flu is bloodsucking bacillus.

• 婴幼儿最易发生而且比较严重，特别容易感染肺炎球菌、脑膜炎球菌、大肠杆菌、流感嗜血杆菌等。