Bacterial fever is usually the most serious from the second to the fifth day of the disease, the specific time there is a certain individual difference, with the individual physique and so on. The clinical symptoms of bacterial infections are more common is fever, generally between 2 to 5 days of the course of clinical symptoms are more obvious, this time is often the critical period of the disease, easy to induce clinical symptoms, including high fever, cough and fatigue, as well as coughing sputum, dyspnea, and loss of appetite. Bacterial infections require identification of the specific type of bacteria, and then sensitive antibiotic treatment; if the type of bacteria cannot be identified, broad-spectrum antibiotics (e.g., cefepime, meropenem, etc.) can be used for treatment. In addition, bacterial infections have a certain degree of danger, it is necessary for patients to actively go to the regular hospital to receive examination and treatment.