Have you heard of xenotransplantation?

kris
"Xenotransplantation is the transplantation of living cells, tissues or organs from one species to another.[1] Such cells, tissues or organs are called xenografts or xenotransplants." Typically animal organs or tissue are transplanted into humans. 
So far no organs have been successful long term but science doesn't seem to be far from its goals. Organs from pigs and baboons are usually the main choice.  On one side, about 25-40% of patients on the organ waiting lists die before they receive an organ so this would greatly reduce the deaths. On the other hand, health officials worry about disease transmission from animal to human. Many ethical arguments are also made. 
What are your thoughts?