What are the big 5 illnesses?

The Big 5 Foodborne Illnesses: Why They Matter

When it comes to food safety, a short list of pathogens stands out—notorious for their potential to cause serious outbreaks if not handled properly. These are often referred to as the "Big 5": Norovirus, E. coli (specifically E. coli O157:H7), Shigella, Hepatitis A, and Salmonella Typhi. These aren’t just common stomach bugs—they’re highly contagious and can spread rapidly in food service environments, making them a top concern for health regulators.

Employees in restaurants, cafeterias, or any food-handling role who show symptoms like vomiting, diarrhea, or jaundice—or who have a sore throat combined with a fever—could be carrying one of these illnesses. In such cases, immediate action is critical. The standard protocol is clear: exclude the employee from work and contact your local Health Department right away. This isn’t just a precaution—it’s a legal and public health necessity.

Norovirus, for example, spreads with alarming speed through contaminated surfaces or food. Hepatitis A affects the liver and can be transmitted through poor hand hygiene. Salmonella Typhi can lead to typhoid fever, a severe illness with systemic impact. Even asymptomatic carriers can transmit some of these pathogens, which is why strict reporting and exclusion policies exist.

Training staff to recognize the signs and empowering them to report symptoms without fear of retaliation is key. Prevention isn’t just about clean kitchens—it’s about protecting the public from invisible threats. When a team acts quickly and responsibly, they don’t just follow the rules—they uphold trust in the food system.