The COVID-19 Vaccine Race by Gavi
Scientists around the world are working at an unprecedented pace to test different types of vaccines that could help to stop the spread of COVID-19.
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When candidate vaccines make it to human clinical trials, they first go through Phase 1 trials primarily to test the vaccine’s safety, determine dosages and identify any potential side effects in a small number of people. Phase 2 trials further explore safety and start to investigate efficacy on larger groups. The final stage, Phase 3 trials, which few vaccines ever make it to, are much larger, involving thousands or tens of thousands of people, to confirm and assess the effectiveness of the vaccine and test whether there are any rare side effects that only show up in large groups. The World Health Organization lists candidates at various stages of clinical trials.
Here is a slightly more in-depth look at the 44 candidate vaccines that are in Phase 1 trials or beyond. To read more go to the link below: