> mRNA vaccine is only active in your body for a few days.

Isn’t the point of it to confer long term immunity? Specifically, it aims to alter the immune system, probably one of the more complicated systems our body has. Immune system disorders are no joke, they can kill or significantly reduce the quality of life. So there is a potential area for things to go wrong.

There is also the case of any long term effects triggered by the short term presence of mRNA. What if it lands in different types of organs, could that cause cancer in 2-3 years, other serious chronic condition. Not by the mRNA still being transcribed there but by some other unintended interaction or lasting damage.

I just don’t understand where the absolute confidence that it’s safe long term is coming from.