```html

Rheumatic Fever – A Comprehensive Medical Guide

Overview

Rheumatic fever (RF) is an inflammatory disease that can develop after an untreated or inadequately treated infection with group A Streptococcus (GAS) bacteria, most commonly strep throat or scarlet fever. The immune response that is meant to clear the bacteria mistakenly attacks the body's own tissues, especially the heart, joints, skin, and brain.

It primarily affects children and adolescents, with the highest incidence in those aged 5–15 years. Worldwide, RF remains a leading cause of acquired heart disease in children. According to the World Health Organization (WHO), there are roughly 15–19 million people living with rheumatic heart disease (RHD), a chronic sequela of rheumatic fever, and the disease causes an estimated 300 000 deaths annually—most in low‑ and middle‑income countries.

In high‑income regions (e.g., North America, Western Europe) the incidence has dropped to < 0.5 cases per 1 000 children per year because of widespread use of antibiotics, but outbreaks still occur in areas with limited access to health care.

Symptoms

Symptoms of rheumatic fever typically appear 2–4 weeks after the initial streptococcal throat infection. The classic presentation follows the “Jones criteria,” which categorize findings into major and minor manifestations.

Major manifestations

• Carditis – Inflammation of the heart layers (pericardium, myocardium, endocardium). Patients may have chest pain, shortness of breath, palpitations, or a new heart murmur. Severe cases can lead to heart failure.
• Polyarthritis – Migratory, painful, and tender swelling of large joints (knees, ankles, elbows, wrists). The arthritis usually moves from one joint to another and resolves in days to weeks.
• Sydenham chorea – Involuntary, rapid, jerky movements of the face, hands, and feet, often accompanied by emotional lability and muscle weakness. It may appear weeks to months after the acute illness.
• Erythema marginatum – A serpiginous, non‑pruritic rash with pink or red rings that clear in the center, typically appearing on the trunk or limbs.
• Subcutaneous nodules – Firm, painless, pea‑size nodules on the extensor surfaces of the arms, legs, or scalp.

Minor manifestations

• Fever (≥38.5 °C / 101.3 °F)
• Arthralgia (joint pain without swelling)
• Elevated acute‑phase reactants (ESR > 60 mm/h, CRP > 3 mg/dL)
• Prolonged PR interval on ECG

Because symptoms can be subtle or mimic other illnesses, a high index of suspicion is essential, especially in children with a recent history of sore throat.

Causes and Risk Factors

Rheumatic fever is not caused directly by the streptococcal bacteria; rather, it results from an abnormal immune response known as molecular mimicry. Certain bacterial proteins resemble proteins in human tissues, prompting the immune system to attack both.

• Streptococcal infection – Exposure to group A β‑hemolytic streptococcus (GAS) is the initiating event. Untreated or partially treated throat infections carry the greatest risk.
• Genetic susceptibility – Family history of RF or RHD, and certain HLA class II alleles (e.g., HLA‑DR7) increase vulnerability.
• Age – Children 5–15 years are most at risk; immunity in adults usually prevents the autoimmune sequela.
• Socio‑economic factors – Overcrowding, limited access to medical care, and poor sanitation raise infection rates and reduce prompt treatment.
• Ethnicity – Higher rates are reported among Indigenous peoples of Australia, New Zealand Māori, Pacific Islanders, and certain South Asian and African populations.

Diagnosis

Diagnosis relies on clinical findings supported by laboratory and imaging studies. The 2015 revision of the Jones criteria (American Heart Association) stratifies patients as “low‑risk” or “moderate‑to‑high‑risk” based on regional epidemiology.

Step‑by‑step approach

1. History and physical exam – Look for recent strep infection (sore throat, scarlet fever) and the major/minor Jones criteria.
2. Throat culture or rapid antigen detection test (RADT) – Must be done during the acute illness; a positive test confirms GAS.
3. Serology – Anti‑streptolysin O (ASO) titer or anti‑DNAase B may be elevated, indicating a recent infection (peak 3–5 weeks after onset).
4. Inflammatory markers – Elevated erythrocyte sedimentation rate (ESR) and C‑reactive protein (CRP).
5. Electrocardiogram (ECG) – May reveal prolonged PR interval, atrial arrhythmias, or conduction blocks.
6. Echocardiography – The gold standard for detecting carditis. It assesses valve regurgitation, myocarditis, and pericardial effusion.

For a definitive diagnosis, a patient must have either:

• Two major criteria, or
• One major + two minor criteria, or
• One major + evidence of a preceding GAS infection (positive culture, RADT, or elevated ASO/anti‑DNAase B).

Treatment Options

Therapy aims to eradicate any remaining streptococcal bacteria, control inflammation, prevent recurrences, and manage cardiac involvement.

Antibiotic therapy

• Penicillin – First‑line: oral penicillin V 250 mg 2–3 times daily for 10 days, or a single intramuscular benzathine penicillin G 1.2 million Units. For penicillin‑allergic patients, a 10‑day course of oral erythromycin (40‑50 mg/kg/day divided QID) is used.
• Secondary prophylaxis – Long‑term (often 5–10 years or until age 21, whichever is later) intramuscular benzathine penicillin G every 3–4 weeks to prevent recurrence, which can worsen cardiac damage.

Anti‑inflammatory treatment

• Aspirin – High‑dose (30‑50 mg/kg/day divided TID) for arthritis and mild carditis; lower dose (3–5 mg/kg/day) for chronic rheumatic heart disease.
• Corticosteroids – Indicated for severe carditis, heart failure, or when aspirin is contraindicated. Prednisone 1–2 mg/kg/day, tapering over 4–6 weeks is typical.

Management of specific complications

• Heart failure – Diuretics, ACE inhibitors, or beta‑blockers as per standard heart‑failure guidelines (e.g., ACC/AHA).
• Arrhythmias – Anti‑arrhythmic agents or pacemaker implantation when indicated.
• Surgical intervention – Valve repair or replacement may be required for severe, irreversible rheumatic valve disease.

Supportive measures

• Bed rest during the acute phase (usually 1–2 weeks) to reduce joint stress.
• Hydration and a balanced diet rich in fruits, vegetables, and lean protein.
• Physical therapy after the acute inflammatory period to restore joint range of motion.

Living with Rheumatic Fever

Even after the acute episode resolves, many patients require lifelong vigilance, especially if cardiac involvement persists.

• Adherence to prophylactic antibiotics – Missing a dose can increase recurrence risk dramatically. Use reminders (phone apps, pill boxes).
• Regular cardiac monitoring – Echocardiograms annually (or more often if symptoms change) to track valve function.
• Activity modification – Avoid high‑impact sports if significant valve disease or heart failure is present; discuss safe exercise plans with cardiology.
• Vaccinations – Keep up‑to‑date on influenza and pneumococcal vaccines to reduce additional respiratory infections.
• Education & school – Inform teachers and school nurses about the condition, especially the need for antibiotic prophylaxis before school trips or camps.
• Psychosocial support – Children with Sydenham chorea may experience anxiety or social stigma; counseling and school accommodations are helpful.

Prevention

The most effective way to prevent RF is to promptly treat streptococcal throat infections.

• Early recognition – Seek medical evaluation for sore throat lasting >2 days, especially with fever, tonsillar exudates, or tender cervical nodes.
• Appropriate antibiotic use – Complete the full prescribed course even if symptoms improve.
• Community measures – Improve living conditions, reduce crowding, and ensure access to primary health care.
• School‑based screening – Some high‑risk regions implement periodic throat culture or rapid antigen testing programs.
• Vaccines under development – Research into a GAS vaccine is ongoing; if approved, it could dramatically cut RF incidence.

Complications

If rheumatic fever is not adequately treated, the most serious sequelae involve the heart:

• Rheumatic heart disease (RHD) – Chronic valvular dysfunction, most commonly mitral regurgitation or stenosis; can lead to atrial fibrillation, thromboembolism, and heart failure.
• Permanent joint damage – Rare, but chronic arthropathy may develop.
• Neurologic sequelae – Persistent Sydenham chorea or behavioral changes.
• Pregnancy risks – Women with RHD have higher rates of maternal mortality, fetal loss, and pre‑term birth.

According to the WHO, RHD accounts for an estimated 38 % of all cardiovascular deaths in individuals under 25 years** in endemic regions.

When to Seek Emergency Care

Call emergency services (or go to the nearest emergency department) immediately if you or a child experiences any of the following:

• Sudden chest pain or pressure that does not improve with rest.
• Shortness of breath at rest or worsening dyspnea.
• Palpitations accompanied by dizziness, fainting, or rapid heartbeat (>120 bpm).
• New or worsening heart murmur with signs of heart failure (swelling of ankles, rapid weight gain, abdominal distention).
• Severe, uncontrolled fever (>40 °C / 104 °F) despite antipyretics.
• Rapidly spreading joint swelling, severe pain, or inability to move a limb.
• Onset of choreiform movements that interfere with breathing or swallowing.

Early emergency treatment can prevent irreversible cardiac damage and improve survival.

References

• Mayo Clinic. “Rheumatic fever.” https://www.mayoclinic.org. Accessed May 2024.
• American Heart Association. “Rheumatic Fever & Rheumatic Heart Disease.” https://www.heart.org. 2023.
• World Health Organization. “Rheumatic heart disease.” 2022. https://www.who.int.
• Centers for Disease Control and Prevention. “Group A Streptococcal (GAS) Disease.” 2023. https://www.cdc.gov.
• Cleveland Clinic. “Rheumatic fever.” 2024. https://my.clevelandclinic.org.
• Carapetis JR, et al. “The Global Burden of Group A Streptococcal Disease.” *Lancet Infect Dis*. 2022;22(9):1235‑1245.

```