Some people are concerned that the development of a vaccine against COVID-19 has been so incredibly fast. And in fact, there are still some things we don't know. For example, how long immunity lasts after vaccinatio. Another question, is safety: what side effects can the vaccines have?
In Norway, 33 seniors died, after being inoculated against COVID-19. Authorities are investigating whether there was a link. That's why the world's setting up monitoring systems watching out for side effects, that may not have been seen in big clinical trials. Still hopes are high that this is the best vaccine in history.
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