小儿急性呼吸道感染(简称上感)是5岁以下儿童的常见病、多发病,特别是春天北方气候干燥,风大灰尘多,通过飞沫更容易引起呼吸道感染。5岁以下儿童一年要平均患4—5次上感,每4次上感中就会有一次肺炎,而肺炎是严重危害儿童健康的疾病,它不仅造成家庭经济上的损失,也是 Infantile acute respiratory infection (referred to as the flu) is a common disease of children under 5 years old, frequently-occurring disease, especially in spring, the northern climate is dry, windy and dusty, more likely to cause respiratory infections through droplets. Children under the age of 5 have an average of 4-5 times a year on the flu, flu every 4 times there will be a pneumonia, and pneumonia is a serious harm to children’s health disease, which not only caused the family economic losses, but also