How did you come to this conclusion? I’ve been curious about it for some time but haven’t seen anything concrete which could explain this at a level I understand.

I wasn’t referring to that but simply the concern that immunity might be relatively short lived: given how well this spreads even a vaccine which only gave, say, 10-12 months might be worthwhile if it meant that we could have schools, transit, restaurants, bars, churches, etc. able to operate normally.

Mutation is not the only factor determining how often a vaccine would be given. If antibodies only last a year from the vaccine dose, it should still be given yearly, even if the virus has not mutated.