Exploration on the Quadrivalent Influenza Vaccine Immunization Schedule for Children Aged 3-8 Years

The goal of this \[To evaluate the immunogenicity and safety of 1 - and 2-dose schedules of quadrivalent influenza vaccine (split virion) in healthy people with and without immunization history.\] is to \[aged 3-8 years\] in \[Healthy people\]. The main question\[s\] it aims to answer are: • \[To evaluate the immunogenicity of a two-dose schedule of quadrivalent influenza vaccine (quadrivalent influenza vaccine) in healthy population aged 3-8 years with or without vaccination history.\] •\[ To evaluate whether antibody levels are different 30 days after one dose of quadrivalent influenza vaccine versus two doses of quadrivalent influenza vaccine in healthy people aged 3-8 years with or without vaccination history.\]