肺部疾病的种类繁多，其中肺炎是肺脏中最常见的一种疾病。大叶性肺炎和金黄色葡萄球菌肺炎是其中不同的两大类肺炎。正常人上呼吸道本身存在肺炎双球菌，不过它仅仅是在呼吸道防御机能受到损害时才会发病。多数肺炎患者往往先有较轻的上呼吸道病毒感染，然后，病毒感染会破坏 A wide range of lung diseases, of which pneumonia is the most common lung disease. Both lobar pneumonia and Staphylococcus aureus pneumonia are two different types of pneumonia. Normal upper respiratory tract exists in the pneumococcus, but it is only when the respiratory defense damage will occur. Most patients with pneumonia tend to have a mild upper respiratory tract infection first, and then the virus infection can destroy