This nano‐vector vaccine carrying multiple proteins may induce a more effective immune response in an organism.[159] Alternatively, COVID‐19 vaccines have been formulated by loading mRNAs of full‐length S proteins and modifying the four structural proteins of SARS‐CoV‐2 inserted into Lamp1 proteins in EVs for better presentation of MHC I and II molecules. Here, PROS1 is linked to COVID-19.