Romaine Lettuce

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Romaine or cos lettuce is a variety of lettuce that grows in a tall head of sturdy dark green leaves with firm ribs down their centers. Unlike most lettuces, it is .In total, there were eight Canadian cases of E. coli O that were genetically similar to the U.S. outbreak linked to romaine lettuce coming from .Epidemiologic, laboratory, and traceback evidence indicated that romaine lettuce from the Yuma growing region was the likely source of this outbreak..