八、麻疹为什么容易并发肺炎?如何预防? 肺炎占麻疹并发症的90％以上,1～3岁年龄组发病率较高。同时,年龄越小(6月～2岁)死亡率越高,这在麻疹流行高峰期表现最为显著。麻疹容易并发肺炎是由于麻疹病毒侵犯人体后,呼吸道受累最为严重。麻疹病毒在上呼吸道繁殖破坏局部组织后,由局部蔓延并经血液循环向下侵犯到肺泡组织,使气管、支气管、肺泡等与鼻咽部一样,发 Eight, why measles easily complicated by pneumonia? How to prevent? Pneumonia accounted for more than 90% of the complications of measles, 1 to 3 age group higher incidence. In the meantime, the lower the mortality rate (from June to 2 years), the higher the mortality rate at the peak of the measles epidemic. Measles easily complicated by pneumonia is due to measles virus invades the body, the most serious respiratory tract involvement. Measles virus in the upper respiratory tract after the destruction of local tissue, by the local spread and down through the blood circulation to the alveolar tissue, the trachea, bronchi, alveoli and nasopharyngeal, etc., hair