The Medical Products Agency's assignment from the government includes reviewing medicines before they start being used in Sweden.
This means, among other things, that the authority is responsible for sounding the alarm if a future vaccine is not safe.
However, it can never be guaranteed that a future drug that is approved will not cause very unusual side effects.
- Very unusual side effects can only be found when very many people have been vaccinated, says Veronica Arthursson, unit manager for drug safety at the Medical Products Agency.
Click on the clip to hear Veronica Arthursson tell more about the approval of new vaccines.