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.

For Brian Kreher, a fourth-generation farmer in the small town of Clarence, New York, the latest outbreak of bird flu has meant many sleepless nights. He considers his 18-acre farm one of the lucky ones. With extensive safety precautions, he hasn't lost any birds to the virus, which has ravaged poultry farms across the US.

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