The foods responsible for most foodborne illnesses in the United States follow a clear pattern, according to new federal analysis. Salmonella, E. coli O157, and Listeria monocytogenes cause more than three million foodborne illnesses annually in the U.S., and a comprehensive government report now shows exactly which foods are driving these outbreaks .

Which Foods Are Causing the Most Foodborne Illness Outbreaks?

The Interagency Food Safety Analytics Collaboration (IFSAC), a partnership between the Centers for Disease Control and Prevention (CDC), the U.S. Food and Drug Administration (FDA), and the U.S. Department of Agriculture's Food Safety and Inspection Service (USDA-FSIS), released its latest annual report analyzing foodborne illness patterns from 2023 . The analysis examined nearly 50,000 illnesses linked to 1,390 outbreaks occurring between 1998 and 2023, providing the most comprehensive picture of which foods pose the greatest risk.

The findings reveal distinct patterns for each major pathogen. For Salmonella, more than 75 percent of illnesses were traced to six food categories :

• Chicken: Responsible for 19.1 percent of Salmonella illnesses, making poultry the single largest source
• Fruits: Linked to 14.2 percent of cases, including both fresh and processed varieties
• Seeded vegetables: Accounted for 13 percent of illnesses, such as tomatoes and peppers
• Pork: Contributed to 11.7 percent of Salmonella cases
• Other produce: Responsible for 10 percent of illnesses
• Beef: Linked to 7.8 percent of cases

E. coli O157 shows a different pattern, with more than 85 percent of illnesses concentrated in just two food categories . Vegetable row crops, particularly leafy greens like lettuce and spinach, accounted for 67.9 percent of illnesses, while beef contributed 18.6 percent. This makes raw or undercooked vegetables and beef the primary concerns for this dangerous pathogen.

Listeria monocytogenes presents yet another profile. More than 75 percent of illnesses were attributed to three food categories: dairy products at 31.9 percent, vegetable row crops at 27.4 percent, and fruits at 15.9 percent . However, the report noted that listeriosis outbreaks are relatively rare, making these estimates less reliable than those for other pathogens.

Why Are These Foods More Vulnerable to Contamination?

Understanding which foods carry the highest risk is only part of the story. The 2026 outbreak trends data reveals that many foodborne illnesses stem from preventable operational issues in food handling and preparation . The leading contributing risk factors include improper cooling and reheating, incorrect cooking temperatures, cross-contamination between foods, poor employee hygiene, and unsafe or unapproved food sources.

The data shows that improper cooling remains one of the most common contributing factors in foodborne illness outbreaks. This is particularly concerning because it affects both commercial food operations and home kitchens. When foods are not cooled quickly enough after cooking, or when they are reheated to insufficient temperatures, pathogens can multiply rapidly.

Beyond operational issues, certain foods are inherently more susceptible to contamination. Raw produce like leafy greens and cucumbers can be contaminated at any point from farm to table, while animal products like chicken and dairy can harbor pathogens if not handled properly. Ready-to-eat foods, which receive no further cooking before consumption, pose particular risks if contaminated during processing or storage.

How to Reduce Your Risk of Foodborne Illness at Home

While food safety professionals and manufacturers bear responsibility for preventing outbreaks, consumers can take concrete steps to protect themselves and their families. Based on the risk factors identified in outbreak investigations, here are practical measures you can implement:

• Cool foods properly: After cooking, place hot foods in shallow containers and refrigerate within two hours (one hour if the room temperature is above 90 degrees Fahrenheit). Use a food thermometer to verify that your refrigerator maintains 40 degrees Fahrenheit or below
• Cook to safe temperatures: Use a food thermometer to ensure chicken reaches 165 degrees Fahrenheit, ground meats reach 160 degrees, and whole cuts of beef reach 145 degrees. These temperatures kill harmful pathogens that may be present
• Prevent cross-contamination: Use separate cutting boards for raw meat and produce, wash your hands thoroughly after handling raw foods, and clean all surfaces and utensils that contact raw meat before using them for other foods
• Wash produce thoroughly: Rinse all fruits and vegetables under running water before eating or cooking, even if you plan to peel them. This removes surface contaminants that may have accumulated during growing or handling
• Practice good hygiene: Wash your hands with soap and warm water for at least 20 seconds before preparing food, after handling raw foods, and after using the bathroom or touching your face

The national foodborne illness snapshot is sobering. The United States experiences approximately 48 million foodborne illnesses annually, resulting in 128,000 hospitalizations and 3,000 deaths . Illinois ranked third nationally for reported foodborne illness outbreaks, with 94 outbreaks documented between 2021 and 2023, underscoring that this is not a distant problem but a local public health challenge.

The 2026 outbreak data also highlighted specific pathogens and foods of concern. Norovirus was responsible for the most illnesses overall, while Salmonella caused the most deaths . Recent confirmed outbreaks have linked Salmonella to eggs, home delivery meals, pistachio cream, cucumbers, mini pastries, and moringa leaf powder. Listeria has been found in prepared pasta meals, deli meats, queso fresco and cotija cheese, ready-to-eat foods, and frozen shakes. E. coli has contaminated raw milk cheese, organic carrots, onions, and walnuts.

The IFSAC report emphasizes that these attribution estimates are intended to inform food safety decision-making and provide pathogen-specific direction for reducing foodborne illness . By identifying which foods and pathogens cause the most harm, federal agencies can prioritize interventions, policies, and resource allocation to protect public health. For consumers, this data serves as a reminder that vigilance in food handling and awareness of high-risk foods are essential components of a clean, healthy kitchen.