Elderly patients with influenza are prone to pneumonia, and the prognosis is often more severe in those who are elderly, frail or have combined cardiopulmonary disease. Early examination shows flushing, mild conjunctival congestion and ocular tenderness, congestion in the pharynx but no secretions, mild enlargement of cervical lymph nodes and tenderness in about 25% of patients, later there may be coarse breath sounds, scattered croup or limited clicking sounds. Prevention: 1. General management: report the epidemic early when the patient is found, isolate the patient in place, actively treat the patient, reduce gatherings and group activities during the epidemic, and wear a mask. 2, vaccine prevention: Although the drift of the influenza virus antigen greatly affects the effectiveness of vaccine prevention, but the best prevention method is still inactivated virus vaccine, which contains two kinds of inactivated virus A and B. Elderly people should be vaccinated against influenza a few weeks before the start of the epidemic season every year, foreign literature reports that its efficiency is 67% to 92%, reducing the hospitalization rate of elderly deaths by about 75%, the only influenza vaccination The only contraindication to influenza vaccination is an allergy to eggs. 3, drug prevention: amantadine, amantadine prevention efficiency of 75% to 90%, before the start of the epidemic season oral amantadine or amantadine 100mg, 1 time / d, for 5-7 weeks (2 weeks for those who are also vaccinated against influenza).