If ground beef is not cooked at a high enough temperature, which of the following should be the biggest concern?

• A. Salmonella toxins
• B. Listeria toxins
• C. E. Coli toxins
• D. Staphylococcus aureus toxins

Answer: (C)

Ground beef can harbor bacteria throughout the meat because grinding mixes surface bacteria into the interior, so you can’t rely on cooking the outside to make it safe. To kill these bacteria, the meat must reach a high internal temperature.

The biggest concern when ground beef isn’t cooked enough is toxins from E. coli, especially E. coli O157:H7. This strain is strongly linked to ground beef and can produce potent toxins that cause severe illness, including bloody diarrhea and kidney injury in children. Cooking ground beef to the recommended safe internal temperature (about 160°F / 71°C) destroys the bacteria and reduces the risk of toxin formation.

Salmonella and Listeria can cause illness from various foods, and Staphylococcus aureus toxins can be a risk in improperly handled foods, but the direct, high-severity link between undercooked ground beef and E. coli toxins makes it the primary concern here.