The risk of transmission to humans remains low, but it can happen. As the popularity of keeping backyard and urban chicken flocks grows, health and agriculture experts warn that bird flu can pose a risk to your feathered friends — and by extension, a small risk to you, as well.

The price of eggs at U.S. grocery stores has climbed to a record high, nearly doubling from a year ago, as outbreaks of bird flu have led to shortages by wiping out millions of hens.

As egg prices soar to new highs, the two industries are on opposite sides of the debate over whether to give shots to birds.