Don't go too overboard on this. There are a few problems to be overcome.
Pigs have built up dormant viruses related to HIV, known as porcine endogenous retroviruses (PERVS), over thousands of years and there are fears they may be passed on to humans who receive transplanted cells and organs.
If viruses did cross the species barrier, some scientists fear the creation of new diseases which could have a devastating effect on human life - what the New Scientist calls the "doomsday scenario".
On the other hand, pigs are genetically the most suitable animal for transplants and the ability to use their organs and cells could solve the worldwide shortage of organ donors.
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