DENVER (AP) – Health officials have issued a warning for Rocky Ford cantaloupes from Colorado amid a bacteria outbreak blamed for four deaths in the state and New Mexico. The warning from the Centers for Disease Control and Prevention came after 16 cases of a strain of Listeria were reported in five states, including 11 from Colorado, two from Texas, and one each from Indiana, Nebraska and Oklahoma. The agency said it was the first Listeria outbreak linked to cantaloupe in the United States. The U.S. Food & Drug Administration said it had not recalled the melons while it worked to locate the source. Several grocery stores in the Rocky Mountain region have voluntarily pulled Rocky Ford cantaloupes. The cantaloupes are grown about 130 mile southeast of Denver and are known for their high sugar content.