More than 160 million wild and domesticated birds have been culled in the U.S. after testing positive for avian flu in the past few years. So why is the country not rushing to vaccinate flocks to stop the spread of the outbreak?

As H5N1 spreads rapidly, wild birds remain at risk. Here’s what to know about the outbreak and how to keep your feathered visitors safe.

With egg prices soaring, the US is considering vaccinating laying chickens, which have been hit particularly hard by the avian influenza outbreak.