Can you tell me what the different Covid vaccines are and how they are different?
Can you tell me what the different Covid vaccines are and how they are different?
user
There are currently two vaccines in development: one made by the US biotech company Moderna, and the other from Pfizer/BioNTech.
assistant
Do you know what makes them different from each other?
user
They both aim to deliver a piece of the virus that causes Covid-19 to the person's body, so that it triggers an immune response that protects the body from reinfection.  The difference is the virus they use:
assistant
Okay and what is the difference in the viruses that they use?
user