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Explain why participants in the Pfizer-BioNTech vaccine trial recorded information in an app after receiving injections.
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Sagot :

Answer:

It helps doctors and scientists better understand the vaccine and it's effects on people, and it'll improve future variations of the vaccine.

Explanation:

We'll likely have to get more vaccines for the virus in the following years, so learning about the side effects it has on people and how likely it is for those to occur helps health officials adapt the vaccine to make it less likely for people to experience symptoms.