The common clinical manifestation of lung infection is fever with cough and sputum. The clinician will decide the initial anti-infection treatment according to the patient’s condition. Generally, if the body temperature can be reduced to normal, the respiratory symptoms improve and the white blood cells return to normal, the treatment is considered effective. It is necessary to cooperate with the doctor to analyze the condition, to retain sputum as early as possible, to clarify the pathogenic bacteria, and to do traumatic examination to help adjust the medication if necessary.