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Salmonella: A Sneaky Food-Borne Bacteria

Salmonella is a type of bacteria that causes salmonellosis, a form of food poisoning. In the United States, it sickens an estimated 1.35 million people each year and is the leading cause of hospitalizations and deaths due to food poisoning. According to Dr. Elizabeth Hohmann of Massachusetts General Hospital, Salmonella can trigger unusual complications and infect people in surprising ways.

Unusual Complications

One patient developed an infected abdominal aortic aneurysm—a dangerous bulge in the body's largest artery—caused by Salmonella. “It’s just an interesting organism and it can be kind of scary,” says Dr. Hohmann.

Common Sources of Salmonella

  • Breaded raw chicken products (nuggets, chicken Kiev)
  • Organic basil and other fresh produce (e.g., cantaloupes)
  • Ground beef, nut butters, raw cookie dough
  • Eggs and raw or unpasteurized milk
  • Flour
  • Backyard poultry and small pets (turtles, frogs)
  • Contaminated pet foods

Modes of Transmission

Salmonella lives in stool and animal feces and can contaminate inanimate objects, soils, and machinery, especially in moist environments. Infection occurs when bacteria on contaminated food or surfaces are transferred from hands to mouth, and people can spread it even if they’re not sick themselves.

Symptoms of Salmonellosis

  • Gastroenteritis: upset stomach, abdominal cramps, diarrhea
  • Onset: as soon as six hours after ingestion
  • Duration: typically 2–3 days, often resolving without treatment
  • Severe signs warranting medical attention: bloody diarrhea, high fever, marked fatigue

Treatment Considerations

Most people recover without medication. Staying hydrated with water or electrolyte drinks helps avoid dehydration. Prescribing antibiotics can paradoxically prolong bacterial shedding, increasing the risk of spreading the infection to others.

High-Risk Groups

Certain individuals are especially vulnerable to serious infection:

  • Infants and young children
  • Elderly adults
  • Pregnant women
  • People with weakened immune systems
  • Those with chronic conditions (e.g., atherosclerosis)

Potential Complications

  • Bacteremia (Salmonella in the blood)
  • Spread to urinary tract, bones, joints, central nervous system
  • Rare vascular complications in those with artery plaque buildup

Prevention Strategies

  • Cook poultry, eggs, and meat thoroughly
  • Avoid raw or unpasteurized foods (milk, eggs, flour)
  • Wash hands, utensils, and surfaces after handling raw products
  • Clean produce under running water; consider extra care for vulnerable households
  • Manage contact with backyard poultry and small pets; wash hands after handling
  • Keep food preparation areas dry and sanitized

“You hate to make people paranoid, so that we’re washing our lettuce leaves with soap, but it’s worth thinking about these things, particularly if you have people in your household who are susceptible—which is an increasing number of people,” Dr. Hohmann advises.

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