But the Vaccine does not prevent you from getting Covid it reduces the symptoms. Why can it not mutate. It is now facing immune systems that are not as effected by it so it will need to mutate.
In "some" cases it doesn't prevent you from getting it and only reduces the symptoms. In other cases it does prevent you from getting it at all. And it also potentially reduces the chances of an asymptomatic person spreading it. Less spreading in general means less chances for it to mutate.