ecoli is from fecal matter or exposure to fecal matter. most ground beef is ground with parts of the intestines, hence the fecal matter. They try to remove but it is still almost always present.
That is why blue rare steak doesn't make you sick. If you quickly add high heat to the outside of the steak you kill of any fecal matter that it may have come in contact with. If you grind sirloin or chuck you can eat it mid rare with no issues.
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