Evaluate the Safety and Efficacy of Quadrivalent Influenza in Real-world Situations.

Inclusion Criteria: * Healthy people aged 3 years and above; * I (or/and his/her legal guardian/authorized representative) can comply with the requirements of the clinical trial protocol after informed consent and voluntary signed informed consent; * No contraindications of quadrivalent influenza vaccine in the package insert and meet the vaccination requirements after medical history inquiry. Exclusion Criteria: * Allergy to any component of the quadrivalent influenza vaccine, including egg, excipients, formaldehyde, or Triton X-100; * people with a history of anaphylaxis after vaccination (allergy to any previous vaccination); * Acute disease, severe chronic disease, acute onset of chronic disease, cold and fever; * Axillary body temperature ≥37.3℃ (\> 14 years old) and ≥37.5℃ (≤14 years old) before vaccination; * Uncontrolled epilepsy; * patients with progressive neurological disease or a history of Guillain-Barre syndrome; * receiving immunoglobulin injection for less than one month; * vaccination with live attenuated vaccine within 14 days before and other vaccines within 7 days before vaccination;