Novel coronavirus infection pneumonia presents with a dry cough without sputum. If novel coronavirus pneumonia is combined with a bacterial infection, the symptoms of cough and sputum will be white. If there is a combination of Pseudomonas aeruginosa infection, the sputum will appear green. Based on the color of the sputum, it is possible to observe which type of bacterial infection the patient has. However, bacteriological tests, such as sputum culture and drug sensitivity tests, should be performed to determine which type of bacteria or pathogen is responsible for the infection, and antibiotics or antiviral drugs should be used for treatment based on the results. In addition to cough and sputum, patients with new pneumonia also have other symptoms, such as chest tightness, chest pain, etc. In severe cases, patients may have difficulty breathing.