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More people are popping up sick from eating romaine lettuce after a nation-wide E. coli outbreak. Here’s why it’s so hard for Americans to dodge this particular bug. USA TODAY

While officials have identified the area responsible for the romaine lettuce E. coli outbreak reported days before Thanksgiving, people should still pause before ordering a salad or buying lettuce at the grocery store.

At least 52 people in 15 states have become sick after eating contaminated romaine lettuce, the CDC reported Thursday. Illnesses started between Oct. 5 and Nov. 18. At least two have people have suffered kidney failure.

Here’s what we know about the outbreak:

What do we know about the contaminated lettuce?

Last month, the Food and Drug Administration announced that the contaminated lettuce likely came from crops in California, specifically Central Coast growing…