How do the symptoms and transmission of salmonella differ from e. Coli?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Salmonella and E. coli are two common bacteria that cause foodborne illness, but they differ in how they spread and the symptoms they cause. Salmonella most often comes from contaminated eggs, poultry, or dairy, and typically triggers fever, diarrhea, and stomach cramps within 6 hours to 6 days of exposure. E. coli, on the other hand, often spreads through undercooked ground beef, unwashed produce, or contaminated water, and can cause severe abdominal cramps, bloody diarrhea, and, in serious cases, kidney complications.

Because symptoms can overlap—and because some strains lead to dangerous complications—identifying the likely cause early matters. If you're experiencing digestive symptoms and aren't sure whether it's a mild stomach bug or something more serious, taking a free, instant, online symptom check can help you understand possible causes and decide whether home care, a doctor's visit, or urgent care is your best next step.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn if salmonella or E. coli fits Discover your symptoms' likely cause and severity Find out if your illness needs care See OTC options for diarrhea and cramps Find a doctor for foodborne illness Understand medically valid home remedies for recovery Check whether salmonella or E. coli is likely

Not seeing your question? No worries.

Submit your own Question

Explanation

Salmonella and E. coli are both types of bacteria that can make people sick, especially in their stomachs. They can cause symptoms like diarrhea and stomach pain, but they spread in different ways and can have different effects.

Transmission

Salmonella: This bacteria is often found in foods like raw eggs, raw poultry, and sometimes in fruits and vegetables. People usually get sick when they eat food that has the bacteria.
E. coli: This bacteria can spread through water or food that is contaminated with feces. It can be found in undercooked ground beef, raw milk, and sometimes in fresh produce.

Symptoms

Salmonella: Symptoms can include diarrhea, fever, and stomach cramps. These usually start 6 hours to 6 days after getting the bacteria.
E. coli: Symptoms can include severe stomach cramps, diarrhea (often bloody), and vomiting. These symptoms usually appear 3 to 4 days after exposure.

Both bacteria can cause serious illness, especially in young children, older adults, and people with weak immune systems. If you're experiencing any of these symptoms and want to better understand what might be causing them, try our free AI symptom checker for personalized guidance. It is important to practice good hygiene and proper food handling to prevent infections.

(References)

Winfield MD, & Groisman EA. (2004). Phenotypic differences between Salmonella and .... Proceedings of the National Academy of Sciences of the United States of America, 15569938.
Meysman P, Sánchez-Rodríguez A, Fu Q, Marchal K, & Engelen K. (2013). Expression divergence between Escherichia coli and .... Molecular biology and evolution, 23427276.
Bhan MK, Khoshoo V, Sommerfelt H, Raj P, Sazawal S, & Srivastava R. (1989). Enteroaggregative Escherichia coli and Salmonella .... The Pediatric infectious disease journal, 2671906.

Thinking about asking ChatGPT?Ask me instead

Tell your friends about us.

We would love to help them too.

For First Time Users

What is Ubie’s Doctor’s Note?

We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.

Was this page helpful?

Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.