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In page Organic food:

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Organic farming has a preference for using manure as fertilizer, compared to conventional farming in general.[citation needed] This practice seems to imply an increased risk of microbiological contamination, such as E. coli O157:H7, from organic food consumption, but reviews have found little evidence that the actual incidence of outbreaks can be positively linked to organic food production.[1][2][3] The 2011 Germany E. coli O104:H4 outbreak, however, was blamed on organically farmed fenugreek sprouts.[4][5]