Influenza is generally diagnosed by combining the patient’s etiology, clinical symptoms and laboratory tests, etc. The specific tests are as follows: 1, blood picture: total white blood cells are normal or reduced, lymphocytes are increased, if combined with bacterial infection, total white blood cells and neutrophils will rise; 2, virus isolation: virus isolation is the gold standard for the diagnosis of the disease, the influenza virus can be isolated directly from the nasopharynx, airway secretions; 3, serum antibody test: the patient’s nasopharynx and airway secretions are positive; 3.Serum antibody test: Double serum examination within 3 days before the onset of the disease and within 2-4 weeks during the recovery period of the patient, and a 4-fold increase in antibody potency is positive; 4.Other tests: such as taking the patient’s nasal mucosa pressure staining to find inclusion bodies, and immunofluorescence detection of antigen as positive.