E. coli O157 illness is most often linked to which product category?

• A. Vegetable row crops (leafy greens)
• B. Beef
• C. Dairy
• D. Seafood

Answer: (B)

E. coli O157:H7 mainly comes from cattle and is most often linked to beef products because the bacteria live in the cattle’s intestines and can contaminate carcasses during slaughter. When beef is ground, any surface contamination gets mixed throughout the product, so even small amounts can end up in the interior. Undercooked ground beef, such as hamburgers, is a common route of illness because it may not reach a high enough temperature to kill the pathogen. While outbreaks have occurred with other foods like leafy greens or dairy, beef products—especially ground beef—remain the most frequent source. Emphasizing thorough cooking and preventing cross-contamination are crucial controls.