A03.3 Shigellosis due to Shigella sonnei

Name of the Condition

• Shigellosis due to Shigella sonnei

Summary

Shigellosis due to Shigella sonnei is an acute bacterial infection of the intestine caused by this specific Shigella species. The condition is characterized by gastrointestinal symptoms, including diarrhea (often bloody), abdominal cramps, and fever. It is highly contagious and spreads through the fecal-oral route, typically via contaminated food, water, or direct person-to-person contact.

Causes

Shigellosis due to Shigella sonnei is caused by infection with Shigella sonnei bacteria, which are transmitted through ingestion of contaminated materials. The bacteria invade the intestinal lining, leading to inflammation and the characteristic symptoms of the illness.

Risk Factors

• Close contact with infected individuals (e.g., in households, childcare settings, or crowded environments).
• Consumption of food or water contaminated with Shigella sonnei.
• Poor hand hygiene practices, especially after using the restroom or changing diapers.
• Travel to areas with inadequate sanitation or hygiene infrastructure.
• Weakened immune systems, which may increase susceptibility to severe infection.

Symptoms

• Diarrhea (often bloody or mucoid)
• Abdominal pain and cramping
• Fever
• Nausea and vomiting
• Tenesmus (painful, incomplete bowel movements)
• Dehydration (in severe cases)

Diagnosis

Diagnosis is confirmed through laboratory testing of stool samples to detect Shigella sonnei bacteria. Stool culture or molecular assays may be used to identify the specific species and guide treatment. Clinical evaluation of symptoms and exposure history also supports diagnosis.

Treatment Options

Treatment focuses on managing symptoms and preventing dehydration. Antibiotics may be prescribed for severe cases or high-risk individuals, though resistance patterns should be considered. Supportive care, including fluid replacement and rest, is often sufficient for mild infections.

Prognosis and Follow-Up

Most individuals recover fully within a week with appropriate care. Follow-up may be needed to monitor for dehydration or complications, especially in vulnerable populations. Antibiotic treatment can shorten the duration of illness and reduce transmission risk.

Complications

• Severe dehydration, which may require hospitalization.
• Hemolytic uremic syndrome (rare but serious, particularly in children).
• Reactive arthritis or other post-infectious complications.
• Spread of infection to others if hygiene measures are not followed.

Lifestyle & Prevention

• Practice thorough handwashing with soap and water, especially after using the restroom or handling food.
• Avoid consuming untreated water or food from unhygienic sources.
• Ensure proper sanitation in childcare or communal settings.
• Stay home from work or school while symptomatic to prevent transmission.

When to Seek Professional Help

Seek medical attention if symptoms worsen, persist beyond a few days, or include high fever, bloody diarrhea, or signs of dehydration (e.g., dizziness, reduced urination). Prompt care is important for severe cases or vulnerable individuals.

Tips for Medical Coders

Use code A03.3 for confirmed cases of shigellosis specifically due to Shigella sonnei. Document the causative organism when available, as this differentiates it from other Shigella species. Ensure clinical correlation with symptoms and diagnostic results to support accurate coding.