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Dangerous bacteria are becoming a bigger problem than ever as new germs arrive in imported products and microbes already here evolve into new forms. In a report for the Institute of Food Technologists, scientists report that the increasing use of manure as fertilizer poses the risk of spreading harmful bacteria to food, either by contaminating irrigation water or coming into direct contact with crops.

Manure harbors bacteria such as E. coli and salmonella and is used as a substitute for chemical fertilizer on both organic and conventional crops. In some countries, chicken manure is fed to farm-raised shrimp.
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