Yersiniosis: Causes, Symptoms, and Prevention

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026

Quick Answer

Yersiniosis is an infection caused by Yersinia enterocolitica bacteria, commonly from raw or undercooked pork, especially chitlins. [1] It causes diarrhea, often bloody, along with fever and abdominal pain, starting 4 to 7 days after exposure and lasting up to 3 weeks. [1] It is contagious during diarrhea and for up to 3 months after it stops. [1] [2]

What the research says

• Yersinia is a small but steady cause of gastroenteritis worldwide. A systematic review and meta-analysis of 47 studies found that Yersinia enterocolitica was present in about 2% of gastroenteritis cases (1.97% by culture and 2.41% by molecular testing). It was found in all age groups, with similar rates in males and females and across seasons, and serotype O3 was the most common. (Riahi et al., Int J Microbiol, 2021) [4]

• Yersinia infection is a real cause of appendicitis-like pain. A meta-analysis of 33 studies (18 in the pooled analysis) found that about half of patients with mesenteric lymphadenitis (51%) and two-thirds of those with terminal ileitis (65%) tested positive for Yersinia, compared with 8% of normal appendices. The authors concluded that Yersinia infection may lead to unnecessary surgery for suspected appendicitis. (Fonnes et al., J Surg Res, 2022) [5]

• Joint and skin complications are more common after yersiniosis than in people without it. In a population-based study in Germany (2009-2010) that followed laboratory-confirmed patients for 4 weeks, 27% were hospitalized, and 6% of patients aged 5 and older had an appendectomy. Symptoms consistent with reactive arthritis were reported by 12% of patients versus 5% of a comparison group, and symptoms consistent with erythema nodosum (a tender skin rash) by 3% versus 0.1%. (Rosner et al., BMC Infect Dis, 2013) [6]

What is Yersiniosis?

Yersiniosis is a type of bacterial infection caused by a germ called Yersinia enterocolitica. [1] [2] This condition primarily affects the digestive system, leading to symptoms like stomach cramps and diarrhea. [1] While anyone can contract the infection, it is significantly more common in children than in adults. [1] In the United States alone, approximately 117,000 people are affected by yersiniosis every year. [1]

The most frequent way people get this infection is by handling or eating pork that has not been cooked to a safe temperature. [1] [2] However, the bacteria can also be found in other animals, including cows, sheep, rabbits, horses, and even household pets like dogs and cats. [1] Because the infection is often linked to food preparation, those who prepare traditional dishes like chitlins (pig intestines) are at a higher risk of both catching and spreading the bacteria. [1]

How Does Yersiniosis Spread?

The primary way people become infected is by ingesting the Yersinia enterocolitica bacteria. This often happens through “fecal-oral” transmission, where bacteria from animal or human waste find their way into the mouth. [1] [2] Common transmission routes include:

• Contaminated food and water: Drinking unpasteurized milk or water that contains the bacteria, or eating food (most commonly raw pork) that has been contaminated. [1] [3]

• Poor hand hygiene: Touching surfaces, animal waste, or diapers that carry the bacteria and then putting your hands in your mouth without washing them first. [1]

• Food preparation: Handling raw pork, such as chitlins, and then touching your mouth or other people before thoroughly cleaning your hands and fingernails. [1]

• Medical procedures: In very rare cases, the infection can be spread through a blood transfusion if the donor was infected. [1] [2]

It is important to remember that an infected person remains contagious as long as they have diarrhea and can continue to shed the bacteria in their waste for up to three months after their symptoms have stopped. [1] [2]

Yersinia enterocolitica spreads to people through undercooked pork, contaminated water, and contact with infected animals.

What are the Symptoms of Yersiniosis?

Symptoms typically begin to appear between four and seven days after a person comes into contact with the bacteria. [1] These symptoms generally last for about three weeks, though the severity can vary based on the person's age.

Symptoms in Young Children

For infants and young children, the most common signs of infection include a fever, abdominal pain, and cramping. [1] Diarrhea is also a hallmark symptom and is frequently bloody. [1] Some children may also develop a sore throat, also known as pharyngitis. [1]

Symptoms in Adults and Older Kids

While older children and adults experience similar symptoms to younger children, they are more likely to have intense pain on the right side of their abdomen. [1] This specific location often leads adults to believe they have appendicitis, an inflammation of the appendix that requires emergency surgery. [1] [3] If you experience severe right-sided pain, it is essential to see a healthcare provider to determine the actual cause.

Yersiniosis can cause right-sided abdominal pain that feels like appendicitis, which is why a healthcare provider needs to tell the two apart.

How is Yersiniosis Diagnosed and Treated?

To diagnose yersiniosis, a healthcare provider will perform a physical exam and ask about your recent history, including what you have eaten. The most common way to confirm the infection is through a stool sample test, where a laboratory looks specifically for the Yersinia enterocolitica bacteria. [1] [2]

Treatment and Recovery

In most cases, yersiniosis will get better on its own without the need for specific medical intervention. [1] [2] The body naturally clears the bacteria, although it may take several weeks for you to feel completely normal again. [1] During this time, the most important step is to drink plenty of fluids to avoid dehydration, which is a common risk when you have diarrhea. [1] [2]

If the infection is severe or if a person has a weakened immune system, a doctor may prescribe antibiotics to help kill the bacteria more quickly. [2] Always follow the full course of any prescribed medication.

Are There Long-Term Complications?

Most people recover fully from yersiniosis, but rare complications include a skin rash, reactive arthritis and, very rarely, sepsis. [1] Some individuals develop a skin rash on their legs and abdomen about a month after the initial infection. This rash is more common in women and typically clears up within a few weeks without causing permanent issues. [1] [2]

A more serious, though rare, complication is reactive arthritis. [1] This condition causes joint pain that usually affects the knees, ankles, and wrists about four weeks after the infection starts. [1] While it can be painful, it usually resolves within six months. [1] In extremely rare cases, the bacteria can enter the bloodstream and cause sepsis, a life-threatening whole-body inflammatory response. [1] [2]

How can you prevent yersiniosis?

Yersiniosis prevention centers on good hygiene and food safety, such as cooking pork thoroughly and drinking only pasteurized milk. [1] [3] By following these steps, you can significantly reduce your risk of infection:

1. Practice safe food handling: Always cook pork and other meats to a safe internal temperature using a food thermometer. [1] Avoid cross-contamination by using separate cutting boards for raw meat and other foods. [1]

2. Use pasteurized products: Only consume milk, cheese, and ice cream that have been pasteurized to kill harmful bacteria. [1] [3]

3. Take special care with chitlins: If you are preparing chitlins, do not touch children or their belongings until you have scrubbed your hands and fingernails thoroughly. [1] Use a bleach solution to clean all pots, utensils, and surfaces afterward. [1]

4. Maintain hand hygiene: Wash your hands with soap and water after using the bathroom, changing diapers, or touching animals. [1] Always wash your hands before you eat or prepare food. [1] [3]

Four kitchen habits that lower your risk: wash your hands, cook pork thoroughly, keep raw meat separate, and choose pasteurized milk.

Conclusion

Yersiniosis is a preventable bacterial infection that, while uncomfortable, usually resolves with rest and hydration. By understanding the risks associated with raw pork and practicing consistent hand hygiene, you can protect yourself and your family from this illness.

What steps can you take to protect yourself from yersiniosis?

If you or your child are experiencing severe abdominal pain or persistent diarrhea, consult a healthcare professional immediately. For more health tips and guides, visit Rinnit.com.

Frequently Asked Questions

What exactly is yersiniosis?

Yersiniosis is a bacterial infection caused by Yersinia enterocolitica that affects the digestive tract. [1] [2]

How do you catch yersiniosis?

Most often by eating raw or undercooked pork, or by touching contaminated surfaces and then touching your mouth. [1]

Can pets spread yersiniosis?

Yes, animals like dogs, cats, and rodents can carry and spread the bacteria. [1]

What are the main symptoms?

Diarrhea (often bloody), fever, and stomach cramps are the most common signs. [1]

Why is the pain often mistaken for appendicitis?

In adults, the infection often causes pain on the right side of the abdomen, which is the same location as appendicitis pain. [1]

How long does the infection last?

Symptoms usually last up to three weeks, though recovery can take several weeks in total. [1]

Is there a test for yersiniosis?

Yes, a doctor can confirm the infection by testing a stool sample in a lab. [1] [2]

Do I need antibiotics for yersiniosis?

Most people do not, but they may be prescribed for severe cases or people at high risk. [1] [2]

How long am I contagious?

You are contagious while you have diarrhea and can remain so for up to three months afterward. [1] [2]

What is the most important thing to do during recovery?

Drink plenty of fluids to prevent dehydration. [1]

Can yersiniosis cause joint pain?

Yes, a rare complication called reactive arthritis can cause joint pain weeks after the infection. [1]

Who is most at risk?

Children are more likely to get the infection, as are people who prepare raw pig intestines (chitlins). [1]

Does yersiniosis cause a rash?

In some cases, especially in women, a rash can appear on the legs and abdomen about a month after infection.

How can I prevent the spread at home?

Frequent handwashing, especially after bathroom use and before food prep, is the best defense.

Is yersiniosis fatal?

Yersiniosis is very rarely fatal, but around 35 deaths occur annually in the U.S. due to complications. [1]

References

1. Cleveland Clinic. Yersiniosis. Cleveland Clinic. Last updated June 30, 2022. Accessed October 15, 2026. https://my.clevelandclinic.org/health/diseases/23400-yersiniosis

2. Aziz M, Rausch-Phung EA. Yersinia enterocolitica infection. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Updated January 31, 2026. PMID 29763012. https://www.ncbi.nlm.nih.gov/books/NBK499837/

3. Bush LM, Vazquez-Pertejo MT. Plague and other Yersinia infections. Merck Manual Consumer Version. Last updated September 2026. Accessed October 15, 2026. https://www.merckmanuals.com/home/infections/bacterial-infections-gram-negative-bacteria/plague-and-other-yersinia-infections

4. Riahi SM, Ahmadi E, Zeinali T. Global prevalence of Yersinia enterocolitica in cases of gastroenteritis: a systematic review and meta-analysis. Int J Microbiol. 2021;2021:1499869. PMID: 34512763. https://doi.org/10.1155/2021/1499869

5. Fonnes S, Rasmussen T, Brunchmann A, et al. Mesenteric lymphadenitis and terminal ileitis is associated with Yersinia infection: a meta-analysis. J Surg Res. 2022;270:12-21. PMID: 34628159. https://doi.org/10.1016/j.jss.2021.08.027

6. Rosner BM, Werber D, Höhle M, et al. Clinical aspects and self-reported symptoms of sequelae of Yersinia enterocolitica infections in a population-based study, Germany 2009-2010. BMC Infect Dis. 2013;13:236. PMID: 23701958. https://doi.org/10.1186/1471-2334-13-236

Medical disclaimer

The information provided in this article is for educational purposes only and is not intended as medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Severe abdominal pain, bloody diarrhea, or a high fever needs prompt medical attention.