Foodborne Pathogens Every Foodservice Employee Should Know by Name

Norovirus

Norovirus is the leading cause of foodborne illness outbreaks in the United States and is highlycontagious. It takes fewer than 20 viral particles to make a person sick. It spreads easily through contaminated hands, surfaces, and ready-to-eat foods. If you have ever been on a cruise or followed illnesses on cruise ships, you have likely heard of norovirus.

Vomiting and diarrhea are the hallmark symptoms, and infected individuals can shed the virus even before they feel sick. This is why an employee who vomits must be immediately excluded from the operation. There is no cooking temperature that eliminates norovirus once it contaminates ready-to-eat food. Your only defense is keeping infected people out and maintaining rigorous handwashing practices.

Hepatitis A

Unlike the other pathogens on this list, Hepatitis A is a virus that attacks the liver. Symptoms include jaundice, fatigue, and nausea. The illnesses can take 15 to 50 days to appear after exposure, which means an infected employee can unknowingly contaminate food for weeks. It spreads through the fecal-oral route, primarily via unwashed hands. Shellfish harvested from contaminated water are a well-known vehicle. Any employee diagnosed with Hepatitis A must be excluded from work. While it is not mandated, vaccination is available and is recommended for food handlers.

Salmonella

This may be among the most familiar names on the list. Nontyphoidal Salmonella is responsible for more hospitalizations from foodborne illness than most any other pathogen. Poultry, eggs, raw produce, and nut butters are common sources. Symptoms include diarrhea, fever, and abdominal cramps beginning six to 72 hours after exposure. Proper cooking temperatures and preventing cross-contamination, especially between raw poultry products and ready-to-eat foods, are critical in controlling it.

While nontyphoidal Salmonella is common in foodservice, Salmonella Typhi, the strain that causes typhoid fever, is treated separately because of its severity and because some people carry it without ever showing symptoms. It is transmitted through the fecal-oral route, often through contaminated water and food. Any employee diagnosed with typhoid fever must be excluded from the operation until cleared by a medical professional.

Shigella

Shigella causes shigellosis, an intestinal infection characterized by bloody diarrhea, fever, and stomach cramps. Like Norovirus, it requires a very small infectious dose, making it spread easily even with minimal contamination. It is found in the feces of infected people and spreads through poor handwashing, contaminated water, and ready-to-eat foods handled by infected employees. Children, the elderly, and immunocompromised individuals are at the highest risk for severe illness. Excluding ill employees and enforcing strict handwashing are your primary defenses.

Shiga Toxin-Producing E. coli (STEC)

You likely know this one as E. coli O157:H7, though there are other dangerous STEC strains. What makes this pathogen particularly frightening is its potential to cause hemolytic uremic syndrome (HUS), a form of kidney failure that can be fatal, especially in young children. Ground beef is the most associated food, but leafy greens, raw sprouts, and unpasteurized juice have all been vehicles in major outbreaks. Cooking to proper temperatures destroys STEC, but cross-contamination from raw meat to ready-to-eat foods is a serious and persistent risk in any kitchen.

Knowing these pathogens by name and understanding how they spread changes how your employees think about every task, from receiving a delivery to washing their hands after a bathroom break. Post this list in your break room. Include it in your onboarding training. Revisit it at your next pre-shift meeting. The employees who understand why the rules exist are the ones who follow them even when no one is watching. That knowledge is what helps build the culture of food safety in your operation. Risk Nothing.