Shigella Alert: What Every Certified Food Protection Manager Must Know

How to prevent Shigella.

In the complex world of food safety, certain pathogens demand our utmost attention. Shigella is one of them. As a certified food protection manager, recognize the threat Shigella poses to build strong defenses in your establishment. Shigella’s high infectivity and severe health consequences demand rigorous control beyond other contaminants.

This isn’t about fear—it’s about empowerment. Understanding the science behind Shigella, including how it spreads and the precise actions to prevent it, enables you to lead your team with confidence. Additionally, it helps you protect every customer who walks through your doors.

Why Shigella is a “Big 6” Pathogen

Shigella is a group of bacteria that causes an infection known as shigellosis. The U.S. Centers for Disease Control and Prevention (CDC) estimates it is responsible for approximately 450,000 infections in the United States each year. Fever, stomach pain, and diarrhea that is often bloody characterize the illness.

However, what truly sets Shigella apart is its designation by the FDA as one of the “Big 6” foodborne pathogens, alongside Norovirus, Hepatitis A, Salmonella Typhi, Nontyphoidal Salmonella, and E. coli. The FDA designates highly infectious pathogens that cause severe illness and are frequently transmitted by food employees as having this special status.

• Extremely Low Infectious Dose: Shigella is notoriously easy to contract. It takes as few as 10 to 100 bacterial cells to cause an infection. This microscopic amount easily transfers from contaminated surfaces or unwashed hands to food.
• Severity of Illness: While many cases resolve in 5-7 days, some can lead to severe complications, including post-infectious arthritis and bloodstream infections.
• Emerging Drug Resistance: The CDC has issued alerts regarding extensive drug-resistant (XDR) strains of Shigella. These “superbug” versions are resistant to all commonly recommended antibiotics, making prevention, not treatment, the only reliable strategy.

How Shigella Spreads in a Food Service Environment

The primary mode of transmission for Shigella is the fecal-oral route. This means an infected person’s stool passes the bacteria to the mouth of another person. In a food service setting, this happens almost exclusively through the hands of an infected food employee. If an employee uses the restroom and fails to wash their hands properly, they can contaminate everything they touch afterward, including food, equipment, door handles, and utensils.

• Direct Food Contamination: This is the most common risk in a kitchen. An infected employee preparing salads, slicing fruit, or making sandwiches can directly transfer the bacteria to ready-to-eat foods.
• Contaminated Water: Produce irrigated or washed with contaminated water can carry Shigella into your kitchen.
• Person-to-Person Spread: Because the infectious dose is so low, the bacteria can spread rapidly among staff members if hygiene protocols are not strictly followed, increasing the risk of a widespread outbreak.

Your Action Plan: A Certified Food Protection Manager’s Prevention Strategy

As a Certified Food Protection Manager, your role is to move from awareness to action. Preventing a Shigella outbreak depends on implementing, monitoring, and enforcing a multi-layered defense system. Your leadership in these areas is non-negotiable.

• Mandate Impeccable Hand Hygiene: This is your single most effective tool. Go beyond simply having sinks available.

• Action: Implement a policy requiring hand washing for at least 20 seconds with soap and water. Ensure it is done after using the restroom, before starting work, between tasks, and any time hands may have become contaminated.
• Verification: Directly observe staff during shifts and make handwashing a key part of your daily walk-throughs.

• Enforce a Strict Employee Health Policy: An employee with diarrhea cannot work.

• Action: The FDA Food Code requires that any employee diagnosed with an illness from Shigella spp. be excluded from work. Your policy must be even more direct: any employee experiencing vomiting or diarrhea, regardless of the cause, must report it and stay home.
• Support: Create a work environment where employees feel safe reporting symptoms without fear of penalty.

• Implement Rigorous Cleaning and Sanitizing: Treat every surface as a potential point of cross-contamination.

• Action: Develop a clear schedule for cleaning and sanitizing all food-contact surfaces, equipment, and high-touch areas (such as cooler handles and POS screens) with approved sanitizers.
• Training: Ensure staff understand the difference between cleaning (removing soil) and sanitizing (reducing pathogens to safe levels), as well as the correct procedures for both.

The key to preventing shigella is handwashing!

A well-trained team led by a knowledgeable certified food protection manager is the ultimate defense against pathogens like Shigella. Your expertise is critical to public health and the success of your business.

Is your team fully ready to handle threats like Shigella? Safe Food Training offers expert, instructor-led options for 8-hour food manager certification and continuing education, all right here in Minnesota. Ensure that you and your team have the knowledge and tools to protect both customers and employees. 

Register for an upcoming course today!