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Overview

Yersinia Infection Overview

Yersinia infection is an illness caused by bacteria in the Yersinia genus, usually after eating contaminated food or having contact with infected animals or environments. Yersinia enterocolitica is the most common cause and mainly affects the digestive system. Yersinia pseudotuberculosis can also cause illness, sometimes with abdominal pain and fever. Young children are affected most often, although anyone can become infected.

Symptoms

Symptoms of Yersinia Infection

  • Diarrhea, which may sometimes be bloody (yersinia diarrhea).
  • Abdominal pain or cramping, which can be pronounced in the lower right abdomen.
  • Fever and chills may occur with the infection.
  • Vomiting can occur, especially in younger children.
  • A rash or painful, swollen joint (reactive arthritis) may develop after the intestinal illness in some people.

Risk Factors

Risk Factors for Yersinia Infection

  • Eating raw or undercooked pork is an important exposure risk for Yersinia enterocolitica.
  • Drinking unpasteurized milk or other untreated products can increase exposure to Yersinia.
  • Contact with infected animals, their feces, or contaminated environments can spread the bacteria.
  • Poor hand hygiene or cross-contamination between raw foods and ready-to-eat foods increases infection risk.
  • Infants and young children are more likely to develop yersinia diarrhea after exposure.
  • A weakened immune system or an underlying condition can increase the risk of severe or prolonged illness.
  • Iron-overload conditions may make invasive Yersinia infection more likely.

Complications

Complications of Yersinia Infection

  • Dehydration can result from ongoing diarrhea or vomiting.
  • A bloodstream infection (sepsis or bacteremia) can occur rarely, particularly in people with weakened immune systems.
  • Reactive arthritis may cause painful or swollen joints after the intestinal infection improves.
  • Skin findings such as tender red nodules (erythema nodosum) may occur after infection.
  • Severe intestinal inflammation or other intestinal complications are uncommon but possible.

When illness is more serious

Know who may need closer monitoring

Complications are uncommon, but they may be more likely in infants, older adults, people with weakened immune systems and those with iron-overload conditions. These groups should contact a clinician promptly if symptoms are severe, persistent or worsening.

Diagnosis

Diagnosis of Yersinia Infection

Clinicians consider the pattern of symptoms, recent foods, animal or environmental exposures, age and underlying health conditions. They may suspect Yersinia when diarrhea or abdominal pain follows a relevant exposure, but other infections can look similar. The diagnosis is usually confirmed with laboratory testing.

  • A stool culture or molecular stool test can identify Yersinia enterocolitica or Yersinia pseudotuberculosis.
  • Blood cultures may be needed when there are signs of bloodstream infection or severe disease.
  • Testing another specimen may be considered when infection has spread beyond the intestine.
  • The laboratory should be told that Yersinia is suspected because special culture methods or handling may be needed.

Treatment & Management

Treatment and Management of Yersinia Infection

Most uncomplicated infections improve with supportive care. Drink fluids as tolerated, replace electrolytes when diarrhea or vomiting causes fluid loss, rest, and ask a clinician which symptom medicines are appropriate. People with significant dehydration, severe illness or risk factors may need medical treatment, intravenous fluids or hospital care; self-treatment should not replace medical assessment.

When antibiotics may be needed

Antibiotics are not needed for every case of Yersinia infection. A clinician may prescribe them for severe, prolonged or invasive infection, or for people at higher risk of complications. The antibiotic choice and duration depend on test results, the affected body system and the person’s health, so treatment for Yersinia enterocolitica should be individualized.

Use medicines carefully

Treatment should be individualized

Do not use leftover antibiotics or anti-diarrheal medicines without medical advice. This is especially important for children, people with bloody diarrhea and anyone with severe or worsening illness.

Prevention

Preventing Yersinia Infection

  • Cook pork thoroughly and use a food thermometer when possible.
  • Avoid unpasteurized milk, juice and other products that may contain bacteria.
  • Keep raw pork and its juices separate from ready-to-eat foods during shopping, storage and preparation.
  • Wash hands with soap and water after handling raw meat and before preparing or eating food.
  • Use safe drinking water and avoid untreated water that may be contaminated.
  • Wash hands after touching animals, animal feces, pet food or farm environments.
  • Clean cutting boards, utensils and surfaces that contact raw pork before using them for other foods.

Outlook and Prognosis

Outlook and Prognosis for Yersinia Infection

Many otherwise healthy people recover from Yersinia infection with supportive care. How long recovery takes and how serious the illness becomes can vary with age, immune status, the body system affected and whether antibiotics or hospital treatment are needed. Some people may have prolonged bowel symptoms or post-infectious joint problems and need follow-up.

  • Arrange follow-up for diarrhea that continues, returns or interferes with eating and drinking.
  • Contact a clinician for unintentional weight loss or difficulty maintaining hydration.
  • Discuss new or persistent joint pain, swelling or stiffness after the infection.
  • Seek review for recurrent abdominal pain, fever or other symptoms after initial improvement.
  • Prompt evaluation is needed when symptoms suggest dehydration, bloodstream infection or another complication.

When Should You See a Doctor

When Should You See a Doctor for Yersinia Infection?

  • Seek medical advice for persistent or severe yersinia diarrhea.
  • Contact a clinician for signs of dehydration, such as very little urination, dry mouth or unusual tiredness.
  • Blood in the stool, a high fever or severe abdominal pain warrants prompt medical assessment.
  • Arrange evaluation for symptoms in an infant or in someone with a weakened immune system or another high-risk condition.
  • Ask for medical advice if vomiting prevents adequate fluid intake or symptoms are getting worse.

Seek urgent care

Do not wait for symptoms to worsen

Get urgent care for confusion, fainting, severe dehydration, inability to keep fluids down, breathing difficulty or rapidly worsening illness. These symptoms may signal a serious complication and require immediate assessment.

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