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Composition of five types of commonly used influenza vaccines: (A) Live attenuated influenza vaccine, (B) Whole virus inactivated vaccine, (C) Spit-virion influenza vaccine, (D) Subunit influenza vaccine, and (E) Virosomes influenza vaccine. These five different compositions of influenza vaccine differ in activity, antigen components and structural organization, which impact the immunogenicity and protective efficacy of the vaccine. The figure was created with Biorender.com.
