A23.0 Brucellosis due to Brucella melitensis

Name of the Condition

• Brucellosis due to Brucella melitensis

Summary

Brucellosis due to Brucella melitensis is a bacterial infection caused by the Brucella melitensis species, which primarily affects the musculoskeletal system, liver, and spleen. The condition is characterized by fever, fatigue, and joint pain, and it is commonly transmitted through contact with infected animals or consumption of contaminated animal products.

Causes

Brucellosis due to Brucella melitensis is caused by the Brucella melitensis bacterium, which is primarily transmitted to humans through direct contact with infected animals (e.g., goats, sheep) or consumption of unpasteurized dairy products from these animals. The bacteria can enter the body through broken skin, mucous membranes, or ingestion.

Risk Factors

• Occupational exposure to livestock or animal products (e.g., farmers, veterinarians).
• Consumption of unpasteurized milk or cheese.
• Travel to regions where Brucella melitensis is endemic.
• Handling of infected animal tissues or fluids without proper protection.

Symptoms

• Intermittent or undulating fever.
• Profuse sweating, especially at night.
• Fatigue and weakness.
• Joint and muscle pain (arthralgia/myalgia).
• Headache.
• Loss of appetite and weight.
• Hepatomegaly or splenomegaly in some cases.

Diagnosis

Diagnosis is based on clinical presentation, exposure history, and laboratory testing. Blood or bone marrow cultures may identify Brucella melitensis, while serologic tests (e.g., agglutination assays) can detect antibodies. PCR testing may also be used for confirmation.

Treatment Options

• Antibiotics: Combination therapy with doxycycline and rifampin is commonly used. Alternative regimens may include trimethoprim-sulfamethoxazole or fluoroquinolones.
• Supportive care: Rest and hydration to manage symptoms like fever and fatigue.
• Monitoring: Regular follow-up to ensure resolution of infection and prevent relapse.

Prognosis and Follow-Up

With appropriate treatment, most patients recover fully, though some may experience prolonged fatigue or joint pain. Follow-up is recommended to monitor for relapse, especially in cases with delayed diagnosis or incomplete treatment.

Complications

• Chronic infection with persistent symptoms.
• Endocarditis (infection of the heart valves).
• Neurobrucellosis (involvement of the nervous system).
• Osteoarticular complications (e.g., arthritis, spondylitis).

Lifestyle & Prevention

• Avoid consuming unpasteurized dairy products.
• Use protective gear when handling animals or animal products.
• Practice good hand hygiene after contact with animals.
• Ensure proper cooking of meat from potentially infected animals.

When to Seek Professional Help

Seek medical attention if you experience persistent fever, unexplained joint pain, or have been exposed to livestock and develop symptoms consistent with brucellosis.

Tips for Medical Coders

When coding for brucellosis due to Brucella melitensis, use ICD-10-CM code A23.0. Ensure documentation specifies the causative organism (Brucella melitensis) and includes details of exposure history, clinical presentation, and diagnostic findings to support the code assignment.