320 COVID-19 vaccines are being developed worldwide, but how will we know which is the best?

A healthcare worker of the free influenza vaccination programme holds a flu vaccine inside a tram, as the global spread of the the coronavirus disease (COVID-19) continues, in Vienna, Austria, October 1, 2020. REUTERS/Lisi Niesner - RC2L9J9A2QKE

CEPI wants to start like-for-like comparisons Image: REUTERS/Lisi Niesner

Kate Kelland
Correspondent, Reuters
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COVID-19 Vaccination Global Health
The number of COVID-19 drugs and vaccines in development worldwide as of October 2, 2020. Image: Statista
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