That’s literally the whole point of trials for vaccines, to determine if they work and what the side effects there are if any. Public health officials then use that data to determine if, how and when to distribute the vaccines based on of those risks of the vaccine outweigh the public health risks of the continued diseas spread
In a global pandemic when millions of people are dying, a 1/10000 risk of reduced quality of life that helps 10/10000 people not die of the pandemic disease and another 100/10000 not experience reduced quality of life from the pandemic disease is pretty easy numbers to say “yes roll it out” because the benefits far outweigh the risks
That’s literally the whole point of trials for vaccines, to determine if they work and what the side effects there are if any. Public health officials then use that data to determine if, how and when to distribute the vaccines based on of those risks of the vaccine outweigh the public health risks of the continued diseas spread
In a global pandemic when millions of people are dying, a 1/10000 risk of reduced quality of life that helps 10/10000 people not die of the pandemic disease and another 100/10000 not experience reduced quality of life from the pandemic disease is pretty easy numbers to say “yes roll it out” because the benefits far outweigh the risks