Bacteria contamination soil tests

Bacteria contamination soil tests

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Credit: STEPHEN AUSMUS/US DEPARTMENT OF AGRICULTURE/SCIENCE PHOTO LIBRARY

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Caption: Bacteria contamination soil tests. Microbiologist (left) examining bacterial colonies in petri dishes, while a technician (background) prepares more soil and water samples for analysis. The dark-blue colonies, an indication of Escherichia coli bacteria, will be isolated and tested for false positives. The E. coli bacterium is normally only found in animal intestines, and its presence in soil can indicate contamination with faecal matter. Some strains cause food poisoning in humans.

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