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PubMed This is a summary of 8 peer-reviewed journal articles Updated
Infectious Disease

What to Expect: Symptoms and Warning Signs

At a Glance

Salmonella symptoms usually start 12 to 96 hours after exposure, causing diarrhea, fever, and stomach cramps for 4 to 7 days. Seek immediate medical care if you experience a fever over 102°F, bloody diarrhea, severe dehydration, or if symptoms last longer than a week.

If you have been exposed to Salmonella, you may be wondering what to expect and whether your symptoms are “normal” for this illness. For most people, salmonellosis (the infection caused by the bacteria) is a short-term digestive upset that the body handles on its own [1].

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The Illness Timeline

Symptoms do not always appear immediately after eating contaminated food. There is a waiting period, called the incubation period, as the bacteria move through your digestive system.

  • Day 1 to 4 (The Waiting Period): After exposure, it typically takes between 12 and 96 hours for symptoms to start [2]. In some cases, it can take up to a week.
  • Day 4 to 11 (Active Illness): Once symptoms begin, a typical illness lasts about 4 to 7 days for healthy adults [1].
  • Weeks 1 to 5 (Recovery & Shedding): Even after symptoms stop, you may continue to shed the bacteria in your stool for up to 4 to 5 weeks [1].

Common Symptoms

The most frequent signs of a Salmonella infection involve the stomach and intestines. You may experience:

  • Diarrhea: This is often the most prominent symptom and can range from mild to severe [3].
  • Abdominal Cramps: Sharp or dull pain and “rumbling” in the stomach area [3].
  • Fever and Chills: A moderate fever is a common sign that your immune system is responding to the bacteria [3].
  • Nausea and Vomiting: These symptoms can make it difficult to stay hydrated [3].
  • Body Aches: Some people also experience headaches or muscle aches during the first few days [3].

“Red Flag” Warning Signs (Acute Complications)

While most cases of Salmonella resolve without medical intervention, certain “red flag” symptoms indicate that the infection may be becoming more serious or causing acute complications like dehydration or bacteremia (when the bacteria enter the bloodstream during the active infection) [4][5].

Seek medical attention immediately if you or a loved one experience:

  • Severe Dehydration: Signs include extreme thirst, a very dry mouth, dizziness when standing up, or producing very little, dark-colored urine [4].
  • High Fever: A persistent fever higher than 102°F (38.9°C) [6].
  • Bloody Diarrhea: Any visible blood in your stool [6].
  • Persistent Vomiting: Being unable to keep down any liquids for an extended period, which prevents rehydration [4].
  • Prolonged Illness: Symptoms that show no sign of improving after 7 days [6].

A Note on High-Risk Groups

If you are over age 65, pregnant, have a weakened immune system, or are caring for an infant, you should contact a doctor at the first sign of illness [1][7]. These groups are more likely to develop invasive disease, where the infection spreads beyond the gut and may require specialized care [1][8].

Common questions in this guide

How long does it take for Salmonella symptoms to start?
Symptoms of a Salmonella infection usually begin between 12 and 96 hours after eating contaminated food or being exposed. However, in some cases, the incubation period can take up to a full week before you feel sick.
How long does a Salmonella infection last?
For most healthy adults, the active illness lasts about 4 to 7 days. It is important to know that even after your symptoms go away, you can still shed the bacteria in your stool for up to 5 weeks, meaning you can still be contagious.
What are the warning signs that my Salmonella infection is getting worse?
You should seek immediate medical care if you develop a fever higher than 102°F, notice blood in your stool, or become severely dehydrated. You should also see a doctor if you cannot keep liquids down or if your symptoms last for more than seven days.
Can I recover from Salmonella at home?
Yes, most healthy adults recover from Salmonella at home without specific medical treatment by resting and staying well-hydrated. However, high-risk individuals, such as infants, the elderly, pregnant women, and those with weakened immune systems, should contact a doctor at the first sign of illness.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my symptoms, do I need to be tested for Salmonella, or should I continue monitoring at home?
  2. 2.At what point should I be concerned if my fever doesn't break or my diarrhea continues?
  3. 3.Are there any specific 'red flag' symptoms I should watch for given my personal health history?
  4. 4.How will I know when I am no longer contagious to others in my household?

Questions For You

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What Are the Signs of Salmonella Bloodstream Infection?

References

References (8)
  1. 1

    Non-typhoidal Salmonella infections in children: Review of literature and recommendations for management.

    Wen SC, Best E, Nourse C

    Journal of paediatrics and child health 2017; (53(10)):936-941 doi:10.1111/jpc.13585.

    PMID: 28556448
  2. 2

    Incubation period for outbreak-associated, non-typhoidal salmonellosis cases, Minnesota, 2000-2015.

    Eikmeier D, Medus C, Smith K

    Epidemiology and infection 2018; (146(4)):423-429 doi:10.1017/S0950268818000079.

    PMID: 29409557
  3. 3

    An Outer Membrane Vesicle-Adjuvanted Oral Vaccine Protects Against Lethal, Oral Salmonella Infection.

    Harrell JE, Kurtz JR, Bauer DL, et al.

    Pathogens (Basel, Switzerland) 2021; (10(5)) doi:10.3390/pathogens10050616.

    PMID: 34069796
  4. 4

    The epidemiology of non-typhoidal Salmonella gastroenteritis and Campylobacter gastroenteritis in pediatric inpatients in northern Taiwan.

    Tseng CF, Chiu NC, Huang CY, et al.

    Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi 2019; (52(3)):449-455 doi:10.1016/j.jmii.2017.08.021.

    PMID: 28988665
  5. 5

    Invasive Non-typhoidal Salmonella (iNTS) Infections.

    Fierer J

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2022; (75(4)):732-738 doi:10.1093/cid/ciac035.

    PMID: 35041743
  6. 6

    Nontyphoidal Salmonella pyomyositis and osteomyelitis in a healthy infant.

    Penfold M, Hasler M, Rahman E, Helfrich A

    BMJ case reports 2025; (18(4)) doi:10.1136/bcr-2024-259722.

    PMID: 40240136
  7. 7

    Clinical presentation and outcomes of non-typhoidal Salmonella infections in patients with cancer.

    Mori N, Szvalb AD, Adachi JA, et al.

    BMC infectious diseases 2021; (21(1)):1021 doi:10.1186/s12879-021-06710-7.

    PMID: 34587893
  8. 8

    Retrospective Description of 27 Cases of Nontyphoidal Salmonella Meningitis in Pediatrics Over 22 Years in France Pleads for a Revision of Age Limit for the Treatment of Salmonella Gastroenteritis in Children.

    Maunier L, Levy C, Baron A, et al.

    The Pediatric infectious disease journal 2026; (45(1)):e10-e12 doi:10.1097/INF.0000000000004966.

    PMID: 40924727

This page provides educational information about Salmonella symptoms and illness timelines. It is not a substitute for professional medical advice, and you should contact a healthcare provider immediately if you experience severe warning signs like high fever or bloody diarrhea.

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