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Increased use of ingredient-based analyses is being promoted by researchers after the method was used to identify the source of infection in an E. coli outbreak. 

Public Health England was alerted to an outbreak of Shiga toxin-producing E. coli (STEC) O157 phage type (PT) 34 in July 2016 involving 56 cases in England and Wales. The source of infection was baby-mixed leaf salad, which was an ingredient in multiple dishes.

“A traditional analysis may have resulted in multiple menu items being associated with illness, thereby failing to identify the true source of infection,”
Continue Reading Analysis shows source of E. coli outbreak was leafy greens