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Romaine lettuce on a black background (Lactuca sativa L. var. longifolia)

Romaine lettuce on a black background (Lactuca sativa L. var. longifolia)

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SAN ANSELMO, CA - MAY 02: Romaine lettuce is displayed at a grocery store on May 2, 2018 in San Anselmo, California. One person in California has died from E. coli linked to romaine lettuce. The Centers for Disease Control and Prevention has confirmed a total to 121 cases in 25 states. (Photo by Justin Sullivan/Getty Images)

SAN ANSELMO, CA - MAY 02:  Romaine lettuce is displayed at a grocery store on May 2, 2018 in San Anselmo, California. One person in California has died from E. coli linked to romaine lettuce. The Centers for Disease Control and Prevention has confirmed a total to 121 cases in 25 states.  (Photo by Justin Sullivan/Getty Images)

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Bacterial colonies

Bacterial colonies

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Escherichia Coli (E. Coli.)

Escherichia Coli (E. Coli.)