According to a Weibo post by Hu Yang, the deputy chief physician of the Respiratory Department of Shanghai Pulmonary Hospital, both types of viruses, H1N1 and H3N2, can cause influenza pneumonia. For patients with weakened immunity, advanced age, or severe underlying diseases, the possibility of pneumonia is even greater. Symptoms of pneumonia include persistent cough, phlegm, gradually worsening breathing difficulties, and hypoxemia. If these symptoms occur, it is necessary to go to the hospital for a chest X-ray or chest CT examination. In severe cases, ICU treatment may be required, and a small percentage of patients may need intubation treatment. Hu Yang stated that every year, there are basic patients who die from influenza virus-induced white lung, while many others recover from influenza pneumonia after treatment. However, they may be left with fibrotic lesions or even fibrosis in their lungs.