Flu-resistant livestock chickens would form "a buffer between wild birds and humans," Wendy Barclay of Imperial College London, the co-lead on the effort, told Reuters. On Wednesday, she wrote to Popular Science with an update to her remarks. "We HOPE that the chicks will be hatched later this year," she wrote, "but cannot guarantee that as science can be unpredictable." The work involves a multi-institutional team, she wrote, and there's still a ways to go. They've only made the idea work in in vitro studies so far, which means the science hasn't made it out of the test tube yet.