Why romaine is the deadliest lettuce

I was surprised when I went to the produce department of three local grocery stores and couldn’t find lettuce mixes in bags or boxes. 

It should not have been a surprise. I knew that romaine lettuce had been cleared off of store shelves because of an E. coli outbreak. I realized that of course those lettuce mixes have some romaine in them.

I had assumed, though, that heads of romaine were the most dangerous; but in fact, according to an article in the Washington Post, it was the pre-cut lettuce mixes that sickened so many people.

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