Campylobacter infection

Disease Description (Causes and Symptoms)

• Definition: Campylobacteriosis is a gastrointestinal infection mainly caused by Campylobacter jejuni and related organisms.
• Causes/Pathophysiology: The bacteria enter orally through infected animals (especially poultry) or contaminated food and water (raw meat, unpasteurized milk, contaminated water, etc.), invade the intestinal mucosa, and cause inflammation. In some cases, bacteremia may occur, affecting other organs such as the central nervous system.
• Incubation Period/Transmission: Generally 2–5 days (1–10 days possible). Bacterial shedding may continue for up to 2–7 weeks after infection. Person-to-person transmission is rare and infection mainly occurs through contaminated food or contact with animals.
• Main Symptoms: Initially (12–48 hours), fever, headache, muscle aches, and general malaise → followed by severe abdominal pain and watery or bloody diarrhea (from several times a day to more than 10 times), with possible nausea and vomiting. Symptoms may be more severe in immunocompromised people, who may also become chronic carriers.

Treatment Methods

• General Principles: Most cases resolve spontaneously (supportive treatment) — fluid replacement and electrolyte management are key.
• Fluid/Electrolyte Replacement: Oral replacement (oral rehydration solution) or intravenous fluids in cases of severe dehydration.
• Antibiotics:
  • Antibiotics are generally unnecessary for mild or moderate gastrointestinal infections.
  • Antibiotics are recommended in the following cases: severe symptoms such as high fever, bloody stool, or frequent diarrhea (e.g., several times a day), symptoms lasting 7 days or more, immunocompromised people, high-risk groups such as children, older adults, and pregnant women, or confirmed bacteremia.
  • First choice: Macrolides (short-course azithromycin; erythromycin was used in the past).
  • Alternative: Fluoroquinolones (e.g., ciprofloxacin) should be used according to susceptibility testing because resistance is increasing.
  • Severe cases/Bacteremia: Intravenous macrolides or antibiotics selected according to susceptibility.
• Use of Antidiarrheal Agents: In cases showing invasive enteritis, such as fever or bloody stool, antidiarrheal agents (such as loperamide) are not recommended because they may worsen symptoms. They may be used cautiously for short-term symptom relief in mild, non-bloody diarrhea.
• Hospitalization/Isolation: Hospital treatment is required for high fever, severe dehydration, bacteremia, immunocompromised people, and similar cases. In hospitals, contact and standard precautions should be followed.

Checklist Before an Outpatient Visit (Including Preparation and Sample Questions)

• Items to Bring:
  • A list of currently taken medications (including prescriptions, OTC medications, and supplements)
  • Recent test results (stool test/culture results if available)
  • A record of when symptoms began and their progression (presence of fever, number of diarrhea episodes, presence of bloody stool, vomiting, symptoms of dehydration, etc.)
  • Recent food history (raw meat, unpasteurized milk, eating out, overseas travel) and contact with animals
  • Underlying conditions (immunosuppression, diabetes, liver or kidney disease, etc.) and whether you are pregnant
• Information to Tell the Healthcare Provider in Advance During the Outpatient Visit:
  • When the diarrhea or bloody stool began and how severe it is (frequency and characteristics)
  • Whether vomiting is present or fluid intake is impossible (for assessing the risk of dehydration)
  • Fever, systemic symptoms, and drug allergies

Examples of General Questions to Ask the Doctor

• "Do I need antibiotics in my case? If you recommend them, which medication should I take and for how long?"
• "How much fluid (or electrolytes) should I consume each day to prevent dehydration?"
• "If my symptoms do not improve, when should I return for medical care (or be hospitalized)?"
• "How high is the risk of complications (e.g., Guillain-Barré syndrome)?"

Examples of Disease-Specific Questions

• "If the diarrhea lasts for 7 days or more, should antibiotic treatment be started, and what additional tests are needed?"
• "How long does bacterial shedding last, and what measures should I take to reduce the risk of transmitting the infection to family members or colleagues?"

Additional Information Summary:

• Prevention Summary: Thoroughly cook poultry, do not consume unpasteurized milk, prevent cross-contamination (clean countertops and knives), wash hands, and boil contaminated water before drinking. Campylobacter can survive for several weeks even at low temperatures (4℃), so refrigeration alone does not completely eliminate it.
• Complications: Guillain-Barré syndrome (a risk of approximately 1 in 1,000 patients), reactive arthritis, and, rarely, bacteremia or meningitis.
• Diagnostic Methods: Confirmed by stool culture or molecular testing (PCR). Signs of inflammation (elevated white blood cell count and CRP) may be observed in cases of fever and on blood tests.

(Prepared by combining the provided materials and standard medical guidelines)