Well for one, cats suffer Aids as in feline aids and they think there is a 'make-up' link with human Aids. Therefore, if they can make up a group of identical cats then the tests done on them would give a more accurate result. This of course leaves the door wide open to the animal experiment row. I dont think the idea is to produce 1,000's of cats to swamp the worlds cat population. I do believe that the company who sponsored the research were interested in producing cats which the owners wish to 're-born' after their precious moggy had passed away.