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Source: Fig. 2 in T. Thanh Le et al. Nature Rev. Drug. Disc. http://doi.org/ggrnbr (2020).

Eight ways in which scientists hope to provide immunity to SARS-CoV-2 

More than 90 vaccines are being developed against SARS-CoV-2 by research teams in companies and universities across the world. Researchers are trialling different technologies, some of which haven’t been used in a licensed vaccine before. At least six groups have already begun injecting formulations into volunteers in safety trials; others have started testing in animals. Nature’s graphical guide explains each vaccine design.

The race for coronavirus vaccines: a graphical guide (PDF)

https://www.nature.com/articles/d41586-020-01221-y