Pneumonia is the inflammation of the terminal airways, alveoli, and interstitial lungs. It can be caused by disease microorganisms, physical and chemical factors, immune damage, allergies, and drugs. Bacterial pneumonia is the most common pneumonia and one of the most common infectious diseases. The pneumonia mentioned in the daily life mainly refers to pneumonia caused by bacterial infection. This pneumonia is also the most common type. Before the application of antibiotics, bacterial pneumonia was a great threat to the health of children and the elderly. The emergence and development of antibiotics once caused a significant reduction in the mortality rate of pneumonia. However, in recent years, despite the use of powerful antibiotics and effective vaccines, the overall mortality rate of pneumonia no longer decreases, or even rises.

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