From flu-ridden sea lions to elephant die-offs, mass mortality events are becoming more common. We understand very little about their repercussions.

Now that minks are getting sick, experts are watching for two signals to indicate whether avian influenza could jump into the human population. But underfunding makes their job harder.

Why paying more for eggs could save us from another pandemic

This spring, a virulent strain of bird flu ripped through U.S. farms. The public hardly noticed. That we could ignore the disease shows just how little we’ve learned about the origin of new viruses.