肺炎是小儿时期常见的呼吸道疾病,尤多见于寒冷季节及北方地区。其内因主要是由于小儿呼吸系统生理解剖特点和免疫功能不够成熟。其外因除居室环境通风不良,使机体抵抗力下降等因素外病原体侵入机体是主要因素。引起呼吸道疾病的病原体很多。导致肺炎的病原体为: Pneumonia is a common childhood respiratory disease, especially seen in the cold season and the northern region. The internal causes are mainly due to the physiological anatomy of respiratory system in children and immune function is not mature enough. In addition to its external causes of poor ventilation in the home environment, so that the body resistance and other factors outside the invasion of pathogens is the main factor. Cause a lot of respiratory disease pathogens. The pathogens that cause pneumonia are: