Tools and Resources

E. coli: How can I tell if food is contaminated?

E. coli: How can I tell if food is contaminated?

You can't tell whether a food is contaminated with E. coli by the way it looks, smells or tastes. Although most types of Escherichia coli (E. coli) bacteria are harmless, certain strains, such as E. coli O157:H7, can cause serious foodborne illness. To protect yourself from E. coli and other foodborne illnesses, follow basic food safety guidelines:

  • Rinse raw produce thoroughly; scrub produce that has a firm surface.
  • Wash your hands, utensils and kitchen surfaces with hot, soapy water before and after preparing or eating food.
  • Keep raw foods, especially meats, separate from ready-to-eat foods.
  • Cook your food thoroughly. Beef, pork, lamb and veal steaks, chops, and roasts should be cooked to a minimum internal temperature of 145 degrees Fahrenheit (63 degrees Celsius). Ground meats other than poultry should be cooked to at least 160 degrees Fahrenheit (71 degrees Celsius). And all poultry should be cooked to 165 degrees Fahrenheit (74 degrees Celsius).
  • Refrigerate or freeze perishable foods promptly.
  • Avoid unpasteurized juices, ciders and dairy products.
  • Don't drink untreated water from lakes or streams.
Updated: 2/4/2012

© 1998-2014 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "," "EmbodyHealth," "Enhance your life," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research.

Legal restrictions and terms of use applicable to content provided to this site by Clinic Health Information. Use thereof signifies your agreement to these terms of use.