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. 2021 May 20;23(8):104841. doi: 10.1016/j.micinf.2021.104841

Table 1.

Number of candidate vaccines under clinical evaluation globally.a

Vaccine design Number of candidates
Whole virus
 Live attenuated 2
 Inactivated 12
Viral vector
 Replicating 4 (VSV, measles virus, and influenza virus)
 Non-replicating 14 (adenovirus 5, adenovirus 26 and MVA)
Protein subunit 29
Virus like particle 5
Nucleic acid
 RNA 13
 DNA 10
Antigen presenting cells with replicating viral vector 1
Antigen presenting cells with non-replicating viral vector 2
a

WHO candidate vaccines, reference [26]. VSV, vesicular stomatitis virus; MVA, modified vaccinia virus Ankara.