I know that there are tons of unknowns surrounding these vaccines, but I'm wondering if we have any idea how transmissible these vaccines are based on what we do know about how they work.

Can the mRNA transmit through blood, saliva or other bodily fluids? Does it spread like an STD? What about the spike proteins? Are these easily transmissible?

I've become very paranoid about this recently. I was at the barbers and became worried that I could've contracted the mRNA because I feel like the clippers/trimmers may not have been sanitized properly, based on the state of the place. I know this may sound ridiculous but I'm just trying to figure out how it spreads, so I can try to live normally for the most part and retain my paranoia for appropriate situations.