Salmonella in Food Recalls: How It Gets Into Food and What the Risk Actually Is

Salmonella is a genus of bacteria found in the intestinal tracts of many animals, including livestock, poultry, reptiles, and even some household pets. It enters the food supply through several routes: contaminated animal products (meat, poultry, eggs), contaminated irrigation water on produce farms, cross-contamination during food processing when animal products contact produce or equipment, and contaminated environmental surfaces in food processing facilities.

In recent years, some of the largest Salmonella recalls have involved products that most consumers would not associate with bacterial contamination risk: peanut butter, cantaloupe, peppers, onions, tahini, sprouts, and packaged salads. These products may be contaminated by contaminated irrigation water, animal intrusion at farms, or cross-contamination during processing.

Unlike Listeria, Salmonella does not grow at refrigerator temperatures — it requires warmer conditions. But this does not mean refrigerated products are safe from Salmonella: the bacteria can survive at refrigerator temperatures without multiplying, and when contaminated refrigerated food is eaten without cooking, the live bacteria can still cause illness.

Salmonellosis — the illness caused by Salmonella — typically begins 6 to 72 hours after exposure. Symptoms include diarrhea (often severe or bloody), fever, stomach cramps, nausea, and vomiting. Most healthy adults recover within 4 to 7 days without medical treatment, though diarrhea may persist longer.

Severe cases require hospitalization, particularly when Salmonella spreads beyond the intestines into the bloodstream — a condition called bacteremia that can be life-threatening. Children under 5, adults over 65, and immunocompromised individuals are at the highest risk of severe illness. Infants are at particular risk for bacteremia from non-typhoidal Salmonella.

A subset of Salmonella infections leads to reactive arthritis — joint pain that develops 3 to 4 weeks after the initial infection and can persist for months or years. This long-term complication is not always recognized as stemming from a prior foodborne illness.

Salmonella recall notices vary considerably in specificity. The most useful notices list the specific serotype of Salmonella involved (there are over 2,500 Salmonella serotypes; the most common in foodborne illness are Salmonella Typhimurium, Salmonella Enteritidis, and Salmonella Newport), the specific product lots affected, the distribution geography, and whether any illness cases have been confirmed.

Recalls issued in connection with a confirmed outbreak — meaning illness cases have been traced to the product through epidemiological investigation — typically include this information. Recalls issued based on environmental or product testing, without associated illness cases, do not indicate that anyone has become sick but reflect preventive action.

When checking whether your product is affected, compare the lot number, best-by date, and UPC code on your product to the specific codes in the recall notice. If your product is not in the affected lot range, it was produced in a different batch and is not part of the recall.

For most Salmonella-contaminated foods, thorough cooking — reaching an internal temperature of 165°F for poultry, 160°F for ground beef and eggs — does kill the bacteria. This is why the risk framework is different for recalled raw chicken than for recalled peanut butter or cantaloupe.

Ready-to-eat foods contaminated with Salmonella present higher risk because there is no cooking step to kill the bacteria before consumption. The same applies to any product you eat raw or with minimal preparation. For these foods, the only safe response to a recall is to stop using the recalled product — do not attempt to make it safe by cooking.

The most important caveat: if you have already eaten a recalled product and experience symptoms of foodborne illness, seek medical attention. This is especially important for young children, elderly individuals, and immunocompromised people. A stool culture can confirm Salmonella as the cause and may influence treatment decisions.