 It's gambling with people's lives. We're fortunate that these workers didn't get severely ill. But from everything we know about this virus, we have every reason to worry that someone could become severely ill. And, Michelle, that's because bird flu can be quite lethal, although so far it has only led to mild illness in the handful of cases documented in the U.S. since April. Well, how concerning is it that new human cases are being found even after months of trying to get this under control?