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.

Commercially available eggs pass through testing, grading and inspection, with extra layers of protection in California, specifically.

As the ongoing bird influenza continues to devastate the nation’s egg production, Turkey plans to export eggs into the U.S. through July in a preliminary agreement reached between the two nations.