NEW YORK (CBSNEWS.COM) – A new report out Friday reveals some leafy greens recently sold at supermarkets were contaminated with a potentially deadly bacteria.

Consumer Reports says it tested nearly 284 samples of fresh greens like lettuce, spinach and kale and found six of those samples tainted with listeria.

A man shops for vegetables beside Romaine lettuce stocked and for sale at a supermarket. (credit: Frederic J. Brown/AFP/Getty Images)

The contaminated samples included both pre-washed and unbagged greens.

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