肺炎为临床上常见疾病,有报告因肺炎住院者占住院总人数的5％,是直接造成死亡或促成死亡的主要原因之一。在儿科,肺炎更为常见,据联合国儿童基金会认为,我国每年有30多万5岁以下儿童死于肺炎,因此临床医师应重视肺炎的防治。肺炎的病因有多种,主要是由病原微生物所引起。在医院外受病原菌侵袭发生的肺炎叫社会获得性 Pneumonia is a common clinical disease. One of the main causes of death or death caused by the fact that pneumonia accounts for 5% of the total number of hospitalizations has been reported. In pediatrics, pneumonia is more common. According to UNICEF, over 300,000 children under the age of 5 die from pneumonia each year in our country. Clinicians should therefore pay attention to the prevention and treatment of pneumonia. There are many causes of pneumonia, mainly caused by pathogenic microorganisms. Pneumonia outside the hospital affected by pathogenic bacteria is socially acquired