NEW : Discovery called a `` significant break '' in outbreak investigation . Strain is David Acheson , which has sickened Two recently . Division of Foodborne : Pepper grown in Mexico , but origin of bacteria uncertain . Bacteria were found at distribution center in Texas , McAllen .
NEW : Discovery called a `` significant break '' in outbreak investigation . Strain is Salmonella Saintpaul , which has sickened hundreds recently . CDC : Pepper grown in Mexico , but origin of bacteria uncertain . Bacteria were found at distribution center in McAllen , Texas .