What Is the Difference Between NTS and Typhoid Fever?

If your lab results show non-typhoidal Salmonella (NTS), you can be reassured that this is not typhoid fever. Non-typhoidal Salmonella is the standard, common form of food poisoning often linked to outbreaks in foods like poultry, eggs, and fresh produce ^[1]. Typhoid fever, on the other hand, is a completely different and more severe illness that typically occurs after traveling internationally to areas with poor sanitation ^[2].

What is Non-Typhoidal Salmonella (NTS)?

Non-typhoidal Salmonella refers to the vast majority of Salmonella bacteria strains that cause standard foodborne illness.

• How you get it: It is usually acquired by eating contaminated foods (such as eggs from a recalled batch) or handling infected animals ^[3].
• Symptoms: NTS primarily attacks the digestive tract, causing gastroenteritis—which includes symptoms like diarrhea, stomach cramps, vomiting, and fever. Symptoms typically start 6 hours to 6 days after exposure ^[2].
• Recovery: For most healthy individuals, the infection is self-limiting ^[4]. This means it resolves on its own within 4 to 7 days. Because severe diarrhea drains your body of more than just water, recovery requires replacing electrolytes with oral rehydration solutions, broths, or electrolyte drinks. While healthy people usually recover without antibiotics, your doctor may prescribe them if you are an infant, an older adult, or have a weakened immune system, to prevent complications.
• Contagiousness: Even though you got it from food, NTS is highly contagious person-to-person. The bacteria is shed in your stool, so strict handwashing—especially after using the restroom—is essential, and you should avoid cooking for others while symptomatic. Some workplaces, like food service or healthcare, may require a negative stool test before you can return.

How is Typhoid Fever Different?

Typhoid fever (also known as enteric fever) is caused by highly specific, human-restricted strains of bacteria called Salmonella Typhi or Salmonella Paratyphi ^[5].

• How you get it: Unlike the NTS found in typical food recalls, the bacteria that cause typhoid fever only live in humans. It spreads through contaminated water and food in regions lacking modern sanitation ^[5]. In the United States, most cases occur in people who have recently traveled abroad.
• Symptoms and Severity: Typhoid fever is a systemic infection, meaning it does not just stay in the gut ^[2]. The bacteria can evade your immune system, enter your bloodstream, and spread to internal organs like the gallbladder ^[5][6].
• Treatment: Because it is a widespread infection throughout the body, typhoid fever always requires prompt, aggressive treatment with antibiotics to prevent severe, life-threatening complications ^[6].

What Your Diagnosis Means for You

Seeing “Salmonella” on a lab report can be frightening, but the “non-typhoidal” designation is an important distinction. It means your body is fighting a localized digestive infection rather than a dangerous systemic disease ^[4].

While NTS usually stays in the gut, there is a small risk that the bacteria can enter the bloodstream—a condition known as invasive non-typhoidal Salmonella (iNTS) ^[7]. This is rare but more common in very young children, the elderly, or those with weakened immune systems ^[8]. If you experience a fever that won’t go down, severe abdominal pain, or an inability to keep fluids down, you should contact your doctor right away.