Why not a Nurse Practitioner? Seems they are more aligned with the parts you enjoy about nursing, come from a care/preventative model vs a PA who is more focused on a diagnosis/disease model.

I’m pretty sure it isn’t part of any normal testing. Maybe if there were symptoms in the donor that indicated rabies or their family noted they had interactions with wild animals, but typically I think it’s mostly hepatitis, HIV, syphilis, toxoplasmosis, cytomegalovirus, chagas, and west Nile that are always checked for.