The largest producer of fresh eggs in the U.S. said Tuesday it had 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.

An Illinois jury ruled this week that several major egg producers conspired to limit the U.S.'s supply of eggs in order to raise prices in a case stemming from a federal lawsuit originally filed 12 years ago.

Cal-Maine Foods, the largest egg producer in the United States, reported revenue doubled and profit surged 718% last quarter because of sharply higher egg prices.