The largest producer of fresh eggs in the U.S. temporarily halted production at a Texas plant after bird flu was found in chickens, and officials said the virus had also been detected at a poultry facility in Michigan.

Ridgeland, Mississippi-based Cal-Maine Foods, Inc. said in a statement on Tuesday that approximately 1.6 million laying hens and 337,000 pullets, about 3.6% of its total flock, were destroyed after the infection, avian influenza, was found at a facility in Parmer County, Texas.