Between the two, I'd do the PPD. It's not intended to be a systemic thing like vaccines are; I'd be more worried about radiation exposure from the x-rays for myself than I would be any issues with transfering anything to my nursling.Â
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Just so you know where I'm coming from- I'm in nursing school at the moment as well, and I wasn't able to get waivers for anything, so I delayed starting until my children were almost completely weaned. They haven't had any vaccinations, and I would have preferred to skip everything but HepB for myself.