I have no idea if having pig organs would make one more susceptible to pig diseases, but I imagine the human immune system (as opposed to a pig immune system) would play a part in this as well.

That said, the anti-rejection meds usually given to transplant patients make them more susceptible to infection in general. So the added risk could be negligible.

Also worth noting, if it were me and my lungs were failing, I’d choose “at risk for pig diseases” over “certain death” any day.