Figure 4.

Vaccine platforms and their ways of producing immunogen in cells. (A) Inactivated vaccine results in a broader spectrum of antigens when it is taken up and broken down by cells. (B) Protein-based vaccine produces a more focused response to a targeted antigen when it is taken up and processed into multiple epitopes by cells. (C) Viral vector vaccine delivers antigen-encoding DNA to cells and enhances the inflammatory response and immunity. (D) Nucleic acid vaccine enters cells and serves as the transcriptional/translational template for protein antigen synthesis.