According to this Nov 1, 2010 article at themedguru.com, "China is the third country in the world, after US and Japan, to have successfully genetically engineered a monkey."
If the genes from one species are being spliced into another species to help cure diseases, it's theoretically possible that we could come up with a new human subspecies that's resistant to a disease that would otherwise wipe out Homo sapiens.
That's the premise of my new science fiction novel, The Venom of Vipers, scheduled to be released Dec 1, 2010.
"So far only mice and rats have been genetically engineered to contain certain diseases which has helped scientists to test their theories before implying them on humans.
However, similar usage of monkeys has been a controversial issue worldwide due to the fear that it could eventually lead to the creation of genetically-engineered humans in future."
The possibility is real. The story is fiction. Look for The Venom of Vipers at Amazon, B&N and Smashwords on Dec 1.