Pulmonary infections are commonly referred to as pneumonia. In general, pneumonia does not require admission to the ICU. admission to the ICU usually refers to a series of serious complications such as acute exacerbation of lung infection, respiratory distress or the development of shock, as well as sepsis or renal failure. Usually, after entering the ICU ward, after 3-5 days of intensive treatment, satisfactory results can be obtained and the patient can be transferred from the ventilator to the general ward. The examination and treatment in the ICU are very powerful and comprehensive, and sometimes even assisted respiratory ventilation, or ventilator therapy, is required.