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Influenza vaccine platforms: a diagram of different influenza vaccine platforms. Currently licensed vaccine formulations include live-attenuated influenza vaccines (A); recombinant HA vaccines (B); and inactivated-whole (C), split (D), or subunit (E) vaccines. Next-generation vaccine platforms include virus-like particles (F), peptide-based vaccines (G), nucleic-acid-based vaccines (H), and viral vector vaccines (I).
