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Current vaccine strategies for SARS-CoV-2. Clockwise from top left: (a), delivery of mRNA encoding viral protein through lipid nanoparticle; (b), direct delivery(electroporation) of plasmid DNA encoding viral protein; (c), human and chimpanzee adenovirus-based delivery of DNA encoding viral protein; (d), injection of inactivated viral vector; (e), injection of genetically modified immune cells
