I think I would bring the original and leave in the safe with my passport. Carry a paper copy, and /or photo on phone. If the original gets damaged or lost, you can always get another at the place where you originally got your vaccine.
I'm sure our state tracks and prints out something equivalent, but, the card with the actual vial stickers won't be able to be duplicated.
My phone usually stays in the safe too, so I think I will print out a bunch of copies in case they get destroyed or lost and grab a copy each time on the way out the door!
Ugh, but I need ID to go along with it? Begs the next question:
Carry around passport
Keep passport in room safe and carry drivers license.
Keep both in the room safe and carry around photo copies.
I'm not used to carrying anything but cash and the occasional credit card if out shopping.
