Clinical Trial to Evaluate the Safety and Immunogenicity of Quadrivalent Influenza Vaccine (7.5μg/0.25ml)

Inclusion Criteria: * Healthy volunteer between 6 - 35 months old; Term birth; Birth weight \>2500g; * Proven legal identity; * Written consent of the guardian(s) of the volunteer; Exclusion Criteria: * Received seasonal influenza vaccine in the current year; * Suffering from seasonal influenza in the past 6 moths; * Axillaty temperature \> 37.0 °C; * History of allergy to any vaccine or vaccine ingredient; * History of serious adverse reaction(s) to vaccination, such as urticaria, difficulty in breathing, angioneurotic edema, abdominal pain, etc; * Autoimmune disease or immunodeficiency; * Congenital malformation, developmental disorders; * Severe malnutrition; * Diagnosed coagulation function abnormal (e.g., coagulation factor deficiency, coagulation disorder, or platelet abnormalities) , or obvious bruising or coagulation disorders; * History of epilepsy (except febrile seizures occurred \< 2 years of age or pure epilepsy occurred within the past 3 years that does not need treatment) * Chronic diseases (e.g., viral hepatitis, tuberculosis, diabetes, blood diseases, or neurological disorders) * Acute disease or acute stage of chronic disease; * Receipt of any of the following products: 1. Any subunit vaccine or inactivated vaccine (e.g., pneumococcal vaccine) or treatment of allergy within 14 days prior to study entry; 2. Any live attenuated vaccine within 30 days prior to study entry; 3. Any other investigational medicine(s) or vaccine within 30 days prior to study entry; 4. Blood product within 3 months prior to study entry; 5. Any immunosuppressant, cytotoxic medicine, or inhaled corticosteroids (except corticosteroid spray for treatment of allergic rhinitis or corticosteroid treatment on surface for acute non-complicated dermatitis) within 6 month prior to study entry; * Participate or will participate in other clinical trial(s) during this study; * Based on the judgment of investigator(s) or the Ethic Committee, there was any condition indicating that the subject should be excluded;