Honestly, there isn't anything to worry about. If your grandmother is 90, she's lived through vaccinations with a lot less efficacy and safety testing than this one received. MRNA vaccine technology isn't new, it's just that we haven't ever had a need to exchange the cost (literally - it's expensive) for the unique benefit it provides (rapid, mass production of a novel vaccine).
Millions of people have been vaccinated already. I am actually halfway through an efficacy trial myself.
Honestly, there isn't anything to worry about. If your grandmother is 90, she's lived through vaccinations with a lot less efficacy and safety testing than this one received. MRNA vaccine technology isn't new, it's just that we haven't ever had a need to exchange the cost (literally - it's expensive) for the unique benefit it provides (rapid, mass production of a novel vaccine).
Millions of people have been vaccinated already. I am actually halfway through an efficacy trial myself.
She'll be ok.