E. coli bacteria on lettuce

In this electron microscope image of green-leaf lettuce, rod-shaped E. coli bacteria nestle inside a minute pore in the leaf called a stoma. Conventional produce sterilization techniques cannot reach pathogens such as E. coli in stomas, said Dr. Rosana Moreira, Texas A&M AgriLife Research food safety engineer. (Texas A&M AgriLife Research photo)

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Taken on December 2, 2010