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What kinds of 100 candidate vaccines are currently being developed?

It can be roughly divided into inactivated virus vaccine, protein vaccine, recombinant virus vector vaccine and nucleic acid vaccine. Inactivated virus vaccine, protein vaccine and recombinant virus vector vaccine are traditional vaccines widely used in the past, and most of the COVID-19 vaccines under study belong to this category; Nucleic acid vaccine is a new type of vaccine, which has not been approved before.