Bird Flu

The more exposures and the more incursions of the bird virus into mammals, the more chances that this could happen. That risk goes up and up. The one that we're really concerned about, I think, is the mink clum. We use ferrets as a model for human flu because the way the virus moves from one ferret to the next is very much the same way that it would move from a person to the next. And of course, ferrets are very closely related to mink and we believe that the same kinds of barriers would exist there.