To evaluate the immunogenicity of administering one dose of influenza virus split vaccine (0.7mL/dose) to individuals aged 60 and above.
Age over 60 years old, gender not limited, and able to provide legal identification;
Volunteers voluntarily participate in the study and sign an informed consent form;
Volunteers have the ability to understand research procedures, use thermometers, scales, and fill out diary cards as required, and can participate in all planned follow-up visits.
On the day of enrollment, the axillary temperature was ≥ 37.3 ℃;
Those who have had influenza in the past 6 months or meet the definition of influenza like cases;
Have received any influenza vaccine within the past 12 months or have planned to receive any influenza vaccine during the study period;
Allergies to any components of the research vaccine, history of allergic reactions to the use of gentamicin sulfate, history of severe allergies to any vaccine/drug, or history of asthma;