However, if they do not screw something up in production (which I regard a larger potential source of error than the vaccine itself) there won't be long term side-effects for most people. There were some side effects from swine-flu in Sweden around 2010 that were certainly major and those affected 1/12.000 people. I would guess that is an upper bound for side effect, but as I said, guessing probabilities of an unknown with sample size one is hard.
BioNtech has been developing mRNA vaccines for cancer patients for some time, so I would not expect any really large long term (in the range of 2-4 years) side-effects for fractions of the population larger than 20% based on that alone.
However, if they do not screw something up in production (which I regard a larger potential source of error than the vaccine itself) there won't be long term side-effects for most people. There were some side effects from swine-flu in Sweden around 2010 that were certainly major and those affected 1/12.000 people. I would guess that is an upper bound for side effect, but as I said, guessing probabilities of an unknown with sample size one is hard.
BioNtech has been developing mRNA vaccines for cancer patients for some time, so I would not expect any really large long term (in the range of 2-4 years) side-effects for fractions of the population larger than 20% based on that alone.