FILE - In this Thursday, Aug. 16, 2007 file photo, a lettuce worker washes romaine lettuce in Salinas, Calif. Leafy green vegetables were the leading source of food poisoning over an 11-year period, federal health officials say, Tuesday, Jan. 29, 2013. However, the most food-related deaths were from contaminated chicken and other poultry. (AP Photo/Paul Sakuma, File)

Associated Press
FILE - In this Thursday, Aug. 16, 2007 file photo, a lettuce worker washes romaine lettuce in Salinas, Calif. Leafy green vegetables were the leading source of food poisoning over an 11-year period, federal health officials say, Tuesday, Jan. 29, 2013. However, the most food-related deaths were from contaminated chicken and other poultry. (AP Photo/Paul Sakuma, File)
FILE - In this Thursday, Aug. 16, 2007 file photo, a lettuce worker washes romaine lettuce in Salinas, Calif. Leafy green vegetables were the leading source of food poisoning over an 11-year period, federal health officials say, Tuesday, Jan. 29, 2013. However, the most food-related deaths were from contaminated chicken and other poultry. (AP Photo/Paul Sakuma, File)
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