A Phase 4 Randomized, Double-blind, Placebo-controlled Study to Evaluate the Safety of 1 New 6:2 Influenza Virus Reassortant in Adults

This prospective annual release study is designed to evaluate the safety of 1 new influenza virus vaccine strain to be included in FluMist Quadrivalent for the 2017-2018 influenza season.本前瞻性年度研究旨在评估拟纳入2017-2018流感季四价喷鼻流感疫苗（FluMist Quadrivalent）的1株新型流感病毒疫苗毒株的安全性。