Fig. 3.

Different types of WHO-approved vaccines for emergency use including; (A) mRNA enter cells and act as a translational template for spike protein synthesis, (B) Viral vector vaccine that delivers antigen-encoding DNA to cells and initiates the inflammatory response and immunity, (C) Inactivated virus vaccine which is up taken and broken down by cells and (D) Recombinant nanoparticle and virus-like particle which release viral synthetic spikes is when up taken then processed into multiple epitopes by cells.