I think that, in principle, any disease that a donor has has some small chance of affecting the recipient. Infections, cancers, prion diseases, toxins are well

I think that, in principle, any disease that a donor has has some small chance of affecting the recipient. Infections, cancers, prion diseases, toxins are well known to do so, some immune issues also have a clear pathway, but in principle even genetic issues could affect the recipient depending on a whole host of complicated biology that we don't fully understand.