FILE - In thus April 23, 2015 file photo, flags flutter in the breeze outside of the Blue Bell Creameries in Brenham, Texas. A supplier of cookie dough that Blue Bell Creameries is blaming for a possible listeria contamination of some of its ice cream products says its product tested negative for the pathogen before being sent to the Texas-based company. In a statement Thursday, Sept. 22, 2016, Iowa-based Aspen Hills said the "positive listeria results were obtained by Blue Bell only after our product had been in their control for almost two months." (Smiley N. Pool/The Dallas Morning News via AP, File)
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