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" ... This opens up the possibility of genetically engineering chickens so that they can't be infected by avian strains of IAVs. This, in turn, could prevent the bird flu from spreading among flocks. However, before you get too egg-cited, it is no small feat to go from some cells in a test tube to a whole, live chicken (or at least a soon-to-be-live chicken). Chickens are complex systems. It's not yet clear what else altering these genes may do to chickens. Will such chickens be able to survive? Will this create other problems? Playing around with genes in this way is a relatively new possibility, so you have to be careful about what may happen. In other words, don't count your superchickens before they've hatched. ... "