SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Escherichia coli bacteria on a lettuce leaf. Their presence may constitute a health hazard and cause severe food poisoning, particularly if the bacteria are toxigenic. They may get onto the vegetables if the water used for irrigation is contaminated with fecal material. Similar bacterial contamination was also found with spinach and green onions. Enhanced SEM. Image width: 18.3 micrometers; magnification: 5465x if the image is printed 10 cm wide.
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