Salmonella contamination has been linked to a wide range of foods, not just the raw chicken and eggs most people suspect. Poultry, eggs, and meat products are the most common sources, but past U.S. outbreaks have also been traced to fruits, leafy greens, nut butters, raw sprouts, and even dry pet food. In the United States, Salmonella causes an estimated 1.28 million infections, 12,500 hospitalizations, and 238 deaths each year, making it the leading cause of death among foodborne pathogens.
Poultry and Meat
Raw and undercooked chicken, turkey, and other poultry are the foods most commonly tied to Salmonella. The bacteria live in the intestines of birds and can contaminate the meat during processing. Even poultry that looks and smells normal can carry the bacteria on its surface or within the tissue. Ground poultry is particularly risky because the grinding process can spread bacteria from the surface throughout the entire product.
Beef, pork, veal, and lamb are also potential sources, especially ground versions. Whole cuts like steaks and chops carry less risk because bacteria tend to stay on the outer surface, where heat reaches first. Ground meat mixes everything together, so the interior needs to reach a safe temperature too. The safe internal temperature for poultry is 165°F (73.9°C). For ground beef, pork, and other non-poultry meats, it’s 160°F (71.1°C). Whole cuts of beef, pork, veal, and lamb need to hit 145°F (62.8°C) and rest for at least three minutes before you cut into them.
Eggs
Eggs are one of the trickier Salmonella sources because contamination can happen before the shell even forms. A specific strain called Salmonella Enteritidis can infect a hen’s ovaries and colonize the developing egg follicle, depositing bacteria into the yolk or the membrane surrounding it. This means even an egg with a clean, uncracked shell can contain Salmonella inside. Cooking eggs to an internal temperature of 160°F (71.1°C) kills the bacteria, which means runny yolks and homemade preparations using raw eggs (like certain salad dressings, cookie dough, or hollandaise sauce) carry real risk.
Fruits, Vegetables, and Leafy Greens
Produce might seem like a safe bet since it doesn’t come from an animal, but Salmonella outbreaks have repeatedly been traced to leafy greens, fresh vegetables, and fruits. The bacteria reach produce through contaminated irrigation water, soil, wildlife, or inadequate sanitation during processing and packaging. In one notable outbreak involving packaged leafy greens, the FDA traced the contamination to a stormwater retention basin adjacent to the farm, where the outbreak strain was found in the water.
Raw sprouts deserve special mention. Seeds need warm, humid conditions to sprout, and those same conditions are ideal for Salmonella to multiply rapidly. If even a small number of bacteria are present on the seed, sprouting creates a perfect growth environment. Washing sprouts doesn’t reliably remove the bacteria because they can be embedded in the sprout tissue itself.
Peanut Butter, Flour, and Other Dry Foods
One of the more surprising categories is low-moisture foods like peanut butter, tree nuts, spices, and raw flour. These products have almost no water, so you might expect bacteria can’t survive in them. In reality, Salmonella is unusually good at surviving starvation and drying. Peanut butter has a moisture level so low that bacteria can’t actively grow, but they can persist for months or even years in a dormant state. When you eat the contaminated product, the bacteria rehydrate in your digestive tract and cause infection.
Multiple major outbreaks have been linked to peanut butter, including a widespread U.S. outbreak in 2006-2007 and another in 2008-2009. Raw almonds and pecans have caused outbreaks too. The drying and starvation stress these bacteria endure actually makes them more heat-resistant, which is why roasting temperatures during processing don’t always eliminate them completely. Raw flour is another common culprit, since grain can be contaminated in the field and flour is never treated with a kill step before it reaches your kitchen.
Raw Pet Food and Dry Kibble
Pet food is an overlooked source of human Salmonella infections. Raw pet diets are especially risky since they contain uncooked meat, but even dry kibble has caused outbreaks. A multistate outbreak of Salmonella Infantis infections was linked to dry dog food produced at a single manufacturing facility, and the people who got sick were the pet owners handling the food, not the pets themselves. Salmonella spreads through the fecal-oral route, so handling contaminated pet food or cleaning up after an infected animal and then touching your mouth or preparing food without washing your hands is enough.
How Salmonella Gets Into Your Body
Once you swallow food carrying Salmonella, the bacteria have a specialized system for breaking into the cells lining your intestine. They essentially force your intestinal cells to swallow them. The bacteria inject proteins directly into your cells using a needle-like structure, triggering the cell membrane to ruffle and fold inward, pulling the bacteria inside. Once inside the cell, Salmonella hides in a protective compartment where it can multiply while partially shielded from your immune system. Symptoms typically start 6 hours to 6 days after you eat the contaminated food and last 4 to 7 days, with diarrhea, fever, and stomach cramps being the most common signs.
Cross-Contamination in the Kitchen
Many Salmonella infections don’t come from eating a contaminated food directly. They come from cross-contamination: bacteria from raw meat or poultry transferring to other surfaces, utensils, or ready-to-eat foods in your kitchen. Something as simple as cutting raw chicken on a board and then slicing fruit on the same surface, or picking up an apple after handling raw meat packaging without washing your hands, is enough to cause infection. A USDA study found that only 32% of people clean and sanitize the surface they used to prepare raw meat.
The highest-risk habits include using the same cutting board for raw meat and other foods, reusing platters or utensils between raw and cooked items, and storing raw meat above other foods in the refrigerator where juices can drip down. Wrapping raw meat securely and placing it on the lowest shelf, using separate cutting boards, and washing hands, knives, and surfaces with hot soapy water after handling raw products are the most effective ways to prevent the spread. When thawing meat in the refrigerator, placing it in a bag or on a dish catches any leaking juices before they reach other food.