Why The Need To Prove Immunity To MMR?

Thanks for your responses. I agree that it probably has more to with protecting the employer from liability if I were of childbearing age. As noted above, one state only was concerned if I was born after a certain year (meaning, I guess, probably not going to be having any children). The other just made a blanket provision, you must do this as the cost of being able to practice here. Of course, it's up to each employer to police this for the state, and to interprete what the law really means (so each may actually interprete it differently).

I guess what doesn't make sense is that if the concern was really for my true risk of injury on the job, they would be insisting that I take hepatitus B vaccine, wouldn't they? So Jolie, I think you are right. It's about liability for them, if I got pregnant. And, I suppose one of my nursing home patients could catch MMR from a co-worker, who was not immune and caught it from her kids (?) But, do they demand the same standards from facility administrators, housekeeping, social workers, etc? It just seems kind of arbitrary to me (and I mean no disrespect to any answers provided). Even visitors can bring infection in to facilities.