Actually, that's still just one theory about how spinach can get contaminated with E. Coli, although the news keeps repeating it as if it were already established as fact. No one knows how or where the contamination started yet. That's why the FDA is telling Americans to avoid all fresh spinach because they really don't know. Obviously, all the spinach produced in the country from all these different farms can't possibly be contaminated, but the gov't can't narrow it down any further at the moment. The warning changes as new information is uncovered. The warnings started vague last week, got more specific, then just got more vague again today.