I'm in Florida, and I wasn't able to bring any immunization records with me to my POPA, so they drew blood and ran titer tests, and then called me to let me know my results and whether or not I would need to come in for a vaccine. If you do have to get vaccinated again for some reason, they will not do it before your start date if it's a live virus (MMR), so you will have to go in on your first day and get that vaccination.