A48.4 Brazilian purpuric fever

Name of the Condition

• Brazilian purpuric fever

Summary

Brazilian purpuric fever is a rare, severe bacterial infection characterized by sudden onset of fever, purpura (bruising), and shock, often progressing to multi-organ failure. It primarily affects children and is associated with Haemophilus influenzae type b (Hib) infections, particularly in regions with limited vaccination access. The condition requires urgent medical intervention due to its rapid progression and high mortality risk.

Causes

Brazilian purpuric fever is caused by invasive Haemophilus influenzae type b (Hib) bacteria, which enter the bloodstream and trigger a systemic inflammatory response. The infection typically follows a respiratory or otitis media episode, with the bacteria spreading to cause vasculitis and purpura. The syndrome is linked to Hib strains producing specific virulence factors, though the exact pathophysiology remains under study.

Risk Factors

• Unvaccinated children (especially under 5 years old)
• Living in regions with low Hib vaccination coverage
• Prior respiratory or ear infections (e.g., otitis media)
• Crowded living conditions or poor sanitation
• Underlying immunocompromised states

Symptoms

• Sudden high fever and chills
• Petechiae or purpura (bruising) on the skin
• Hypotension (low blood pressure) and shock
• Altered mental status or lethargy
• Abdominal pain or vomiting
• Possible seizures or organ dysfunction

Diagnosis

Diagnosis is based on clinical presentation (fever, purpura, shock) and confirmed by laboratory tests. Blood cultures may isolate H. influenzae type b, while PCR or antigen testing can detect bacterial DNA or proteins. Imaging (e.g., CT) may assess organ involvement, and lumbar puncture rules out meningitis. Clinical judgment is critical given the condition’s rapid progression.

Treatment Options

Immediate hospitalization and intensive care are mandatory. Treatment includes intravenous antibiotics (e.g., ceftriaxone) targeting H. influenzae, fluid resuscitation for shock, and vasopressors if needed. Adjunct therapies (e.g., corticosteroids) may be considered, but outcomes depend on early intervention. Supportive care for organ failure (e.g., dialysis) is often required.

Prognosis and Follow-Up

Prognosis is poor without prompt treatment, with high mortality rates. Survivors may experience long-term complications like neurological deficits or organ damage. Follow-up includes monitoring for sequelae, rehabilitation, and vaccination (if not previously immunized) to prevent recurrence. Regular check-ups assess recovery and address residual effects.

Complications

• Multi-organ failure (kidney, liver, or heart)
• Septic shock
• Neurological damage (e.g., seizures, cognitive impairment)
• Skin necrosis or gangrene
• Secondary infections (e.g., meningitis)

Lifestyle & Prevention

• Ensure Hib vaccination for children per local guidelines.
• Practice good hygiene (handwashing) to reduce infection risk.
• Seek prompt treatment for respiratory or ear infections in children.
• Avoid exposure to crowded, unsanitary environments where Hib may spread.

When to Seek Professional Help

Seek emergency care immediately if a child develops sudden fever, unexplained bruising, or signs of shock (e.g., pale skin, rapid breathing, confusion). Early intervention is critical to improve survival chances.

Tips for Medical Coders

Code A48.4 is specific to Brazilian purpuric fever. Document the clinical presentation (fever, purpura, shock) and confirmatory tests (e.g., blood cultures, PCR) to support the diagnosis. Ensure the code is not used for other H. influenzae infections (e.g., meningitis) unless the condition matches the syndrome’s criteria. Follow local coding guidelines for accuracy.