Information You Need: Vaccines are entering phase 3 of clinical trials

Of the 37 vaccines that are currently undergoing human trials for the prevention of COVID-19, 9 of these vaccines have entered phase 3 of clinical trials, but what does this mean?

How many clinical trial phases are there?

What is happening in phase 3?

  • In phase 3, there are at least two groups in the clinical trial: one group who received the vaccine and another group who receives a placebo (i.e., a treatment that mimics the appearance, but has no effects). The trials are organized this way in order to compare the two groups and measure a difference between the number of people infected with COVID-19 and to monitor any side effects. 

What does this mean for the vaccine approval timeline?

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