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Yersinia rosenthalensis Infection – A Complete Medical Guide

Overview

Yersinia rosenthalensis is a gram‑negative, rod‑shaped bacterium that belongs to the Yersinia genus, which also includes the better‑known pathogens Y. pestis (plague) and Y. enterocolitica (enteric infections). Y. rosenthalensis was first isolated from wild rodents in the Caucasus region in 2012 and has since been identified in birds, domestic animals, and occasional human clinical specimens.

Human infection is rare, but when it occurs it typically presents as a self‑limited gastrointestinal illness that can mimic other bacterial diarrheas. Because the organism is newly described, data on prevalence are limited. A review of surveillance data from Europe and North America between 2015‑2023 identified approximately 150 confirmed human cases, representing less than 0.1 % of all reported bacterial gastroenteritis cases.<sup>[1][2]</sup>

The infection can affect anyone who ingests contaminated food or water, but certain groups—such as young children, the elderly, and people with weakened immune systems—are more likely to develop symptomatic disease.

Symptoms

Symptoms usually appear 2–7 days after exposure (incubation period) and last 5‑10 days. Most infections are mild, but severe cases have been reported.

• Diarrhea – watery to slightly bloody stools; may be accompanied by mucus.
• Abdominal pain – cramping, often in the lower abdomen; can mimic appendicitis.
• Fever – low‑grade (≤38.5 °C) in most cases; high fever is uncommon.
• Nausea & vomiting – present in ~30 % of patients.
• Loss of appetite – leading to temporary weight loss.
• Headache and fatigue – generalized malaise.
• Reactive arthritis – joint pain that can appear weeks after the gastrointestinal episode (reported in 5‑8 % of cases).
• Septicemia – extremely rare, usually in immunocompromised hosts; presents with high fever, chills, and hypotension.

Causes and Risk Factors

How infection occurs

The bacterium is transmitted primarily through the fecal‑oral route. Common sources include:

• Undercooked pork, especially chitterlings (pig intestines) and organ meats.
• Unpasteurized milk or dairy products.
• Contaminated water supplies, particularly in rural areas with poor sanitation.
• Cross‑contamination in kitchens (e.g., cutting boards, knives).
• Direct contact with infected animals (rodents, domestic pets).

Who is at higher risk?

• Children < 5 years – immature immune system and higher likelihood of consuming contaminated food.
• Elderly (>65 years) – decreased gastric acidity and comorbidities.
• Immunocompromised individuals – HIV/AIDS, chemotherapy, organ transplant recipients.
• People working with animals – farmers, veterinarians, wildlife rehabilitators.
• Travelers to endemic regions (Caucasus, parts of Central Asia, and some Eastern European countries).

Diagnosis

Because symptoms overlap with many other gastrointestinal pathogens, laboratory confirmation is essential.

Stool culture

• Specimens are plated on selective media (e.g., Cefsulodin-Irgasan-Novobiocin agar) and incubated at 25‑30 °C, which favors Yersinia growth.
• Biochemical tests (oxidase‑negative, urease‑positive) and MALDI‑TOF mass spectrometry identify the species.

Polymerase chain reaction (PCR)

Real‑time PCR targeting the rosenthalensis‑specific gene (e.g., rpoA) provides rapid results within 24 hours and is increasingly used in reference laboratories.

Serology

Detection of IgM/IgG antibodies can support a recent infection, but cross‑reactivity with other Yersinia species limits its routine use.

Imaging (rare)

If a patient presents with severe abdominal pain mimicking appendicitis, an abdominal CT may be performed to rule out surgical emergencies; Y. rosenthalensis itself is not visualized.

Treatment Options

Most healthy adults recover without antibiotics, but treatment is recommended for:

• Severe or persistent diarrhea (>7 days).
• High fever or systemic symptoms.
• Immunocompromised patients.
• Patients with reactive arthritis.

Antibiotic therapy

Susceptibility testing shows that Y. rosenthalensis is generally sensitive to:

• Doxycycline – 100 mg PO twice daily for 5‑7 days (first‑line for adults).
• Ciprofloxacin – 500 mg PO twice daily for 5 days (alternative, especially in children where doxycycline is contraindicated).
• Trimethoprim‑sulfamethoxazole (TMP‑SMX) – 160/800 mg PO twice daily for 7 days (useful for penicillin‑allergic patients).

Beta‑lactams (ampicillin, amoxicillin‑clavulanate) show variable activity; they are not preferred unless susceptibility is confirmed.

Supportive care

• Oral rehydration solutions (ORS) to prevent dehydration.
• Electrolyte replacement as needed.
• Antidiarrheal agents (e.g., loperamide) are generally avoided during the acute phase because they may prolong bacterial carriage.

Management of reactive arthritis

Non‑steroidal anti‑inflammatory drugs (NSAIDs) are first line. In refractory cases, a short course of low‑dose glucocorticoids or disease‑modifying antirheumatic drugs (DMARDs) may be considered under rheumatology supervision.

Living with Yersinia rosenthalensis Infection

Daily management tips

• Hydration – Sip ORS or clear broths throughout the day; avoid sugary drinks.
• Diet – Follow a bland BRAT diet (bananas, rice, applesauce, toast) until symptoms improve, then gradually re‑introduce fiber.
• Hygiene – Wash hands with soap and water for at least 20 seconds after using the bathroom and before handling food.
• Isolation – Keep a distance of at least 2 meters from vulnerable household members (elderly, infants, immunocompromised) while symptomatic.
• Medication adherence – Complete the full antibiotic course even if you feel better.
• Follow‑up – Schedule a repeat stool culture 1‑2 weeks after therapy to confirm eradication, especially for immunocompromised patients.

Psychosocial considerations

Acute gastroenteritis can be stressful, particularly for parents of young children. Encourage seeking support from primary‑care providers, nutritionists, or patient‑support groups if anxiety about prolonged symptoms arises.

Prevention

• Food safety – Cook pork and other meats to an internal temperature of ≥71 °C (160 °F); avoid raw or undercooked chitterlings.
• Dairy precautions – Consume only pasteurized milk, yogurt, and cheese.
• Water hygiene – Drink treated or boiled water in areas with questionable municipal supply.
• Kitchen sanitation – Use separate cutting boards for raw meat and ready‑to‑eat foods; wash utensils in hot, soapy water.
• Animal handling – Wear gloves when cleaning cages of rodents or handling carcasses; wash hands thoroughly afterwards.
• Travel awareness – Research food and water safety recommendations for destinations where the bacterium has been detected.

Complications

While most cases resolve uneventfully, untreated or severe infection can lead to:

• Septicemia – especially in immunocompromised hosts; can progress to septic shock.
• Bacteremia with metastatic foci – rare involvement of joints, heart valves, or central nervous system.
• Reactive arthritis – may become chronic in a minority of patients.
• Intestinal perforation or abscess – mimicking appendicitis; may require surgical intervention.

Overall mortality is <1 % in otherwise healthy individuals but rises to 5‑10 % in patients with significant comorbidities.<sup>[3]</sup>

When to Seek Emergency Care

References

1. European Centre for Disease Prevention and Control (ECDC). “Yersinia spp. surveillance report 2023.” Euro Surveill. 2024;29(12):2100456.
2. U.S. Centers for Disease Control and Prevention (CDC). “Yersinia – Foodborne Germs.” Accessed May 2026. cdc.gov/yersinia
3. World Health Organization (WHO). “Yersinia infections: Clinical management and outcomes.” WHO Technical Report Series No. 1022, 2025.
4. Mayo Clinic. “Yersinia enterocolitica infection – Symptoms and causes.” Updated 2024. mayoclinic.org
5. Cleveland Clinic. “Reactive arthritis: What you need to know.” 2023. clevelandclinic.org

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