Several major retailers are imposing restrictions to help ensure customers can still by eggs as the deadly bird flu runs rampant.

A deadly outbreak of avian flu has wiped out nearly half of the egg-laying hens in the U.S., leaving grocery store aisles empty, driving up prices and forcing retailers to limit purchases to curb hoarding.

Trader Joe’s isn’t alone, several other Lexington grocery stores have begun rolling out purchase limits. Blame the highly contagious bird flu, which has led to the loss or culling of more than 13 million egg-laying hens since December,