Acute Rheumatic Fever (ARF)
Post-Streptococcal Autoimmune Inflammatory Connective Tissue Disease
Primary risk age: 5 to 15 Years (Rarely occurs in children under 3 years)
- Urgency
- Severe
- Typical age
- 5 to 15 Years (Rarely occurs in children under 3 years)
- Body system
- Cardiovascular System
Typical course: Acute attack typically resolves within 4 to 12 weeks; secondary antibiotic prophylaxis must be maintained for years (often until age 21 or longer).
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Post-Streptococcal Autoimmune Inflammatory Connective Tissue Disease
Pathophysiology (Development Path)
Caused by "molecular mimicry" between streptococcal antigens (specifically the M protein) and host tissues. Antibodies generated against the streptococcal bacterium cross-react with cardiac myosin, joint synovium, basal ganglia, and subcutaneous tissues, triggering a widespread autoimmune inflammatory response.
Primary Causes & Etiology
An autoimmune sequela following an untreated or inadequately treated Group A Beta-Hemolytic Streptococcal (GAS) pharyngitis.
2. Symptom Continuum
- Early Onset Signs
A history of pharyngitis 2 to 4 weeks prior, followed by the sudden onset of fever and migratory polyarthritis (extremely painful swelling and redness shifting between large joints).
- Progressive Phase
Signs of carditis (new heart murmur, chest pain, pericardial friction rub), subcutaneous nodules (painless, firm nodules over bony prominences), and erythema marginatum (a non-pruritic, pink rash with pale centers and rounded borders on the trunk).
- Severe Indicators
Sydenham Chorea (St. Vitus' Dance): rapid, purposeless, involuntary movements of the face and limbs, accompanied by muscle weakness and emotional lability. Severe carditis leading to congestive heart failure.
3. Clinical Verification
Jones Criteria: requires evidence of preceding GAS infection plus either 2 major criteria (Carditis, Polyarthritis, Chorea, Erythema marginatum, Subcutaneous nodules) or 1 major plus 2 minor criteria (Fever, Arthralgia, prolonged PR interval on ECG, elevated CRP/ESR).
4. Care & Elements Plan
Primary Care Treatment Plan
Eradicate remaining streptococcal infection with antibiotics. Control joint pain and systemic inflammation with anti-inflammatory agents. Provide long-term antibiotic prophylaxis to prevent recurrences and progressive rheumatic heart disease.
Home Support Elements
Strict bed rest during the acute phase, especially if carditis is present. Ensure compliance with daily oral or monthly intramuscular antibiotic regimens.
Generic Active Ingredients (No Brands)
- Penicillin V or Benzathine Penicillin G (antibiotic active ingredients for GAS eradication and secondary prevention)
- Naproxen or Aspirin (salicylates/NSAIDs active ingredients to manage polyarthritis and inflammation).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Consult a doctor immediately if a child develops severe or shifting joint pain, shortness of breath, chest pain, or involuntary twitching movements weeks after a sore throat.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Prompt diagnosis and complete 10-day antibiotic treatment of all documented Group A Streptococcal sore throats.
Immunization Context
No vaccine is currently available targeting Group A Streptococcus.
7. Timelines & Outlook
Active Timeline
Acute attack typically resolves within 4 to 12 weeks; secondary antibiotic prophylaxis must be maintained for years (often until age 21 or longer).
Expected Prognosis
Joint symptoms resolve completely. The long-term prognosis depends on the severity of carditis during the initial attack; repeated episodes can lead to permanent scarring of the mitral and aortic valves (Rheumatic Heart Disease).
Potential Untreated Complications
Chronic Rheumatic Heart Disease, mitral valve stenosis, aortic valve regurgitation, infective endocarditis, and heart failure.
More in Acquired Inflammatory Vascular Pathologies
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