Rheumatic fever is an inflammatory disease that can develop after certain infections caused by Group A Streptococcus (GAS), particularly strep throat and, in some settings, scarlet fever or impetigo. It is most common in children between 5 and 15 years of age and can affect the joints, heart, skin and nervous system.
What makes rheumatic fever particularly important is that the infection itself is not the main problem. Instead, the body’s immune response after the infection can mistakenly attack healthy tissues. When the heart is affected, inflammation can damage the heart valves and eventually lead to rheumatic heart disease.
The good news is that rheumatic fever is often preventable. Prompt diagnosis and appropriate antibiotic treatment of Group A strep infections can substantially reduce the risk.
What is rheumatic fever?
Rheumatic fever, also called acute rheumatic fever (ARF), is a delayed inflammatory complication of a Group A Streptococcus infection. It is not a bacterial infection directly spreading throughout the joints or heart. Rather, it is believed to result from an abnormal immune response that occurs after the infection.
Symptoms usually develop around 1 to 5 weeks after a Group A strep infection, although the timing can vary.
The disease can involve several parts of the body, including:
- Heart and heart valves
- Joints
- Brain and nervous system
- Skin
Heart involvement is the most concerning because repeated episodes of rheumatic fever can eventually cause permanent valve damage.
What causes rheumatic fever in children?
The main cause of rheumatic fever in children is a previous infection with Streptococcus pyogenes, commonly known as Group A Streptococcus or Group A strep.
The most familiar infection is strep throat (streptococcal pharyngitis). Rheumatic fever can also follow scarlet fever, and CDC guidance notes that Group A strep skin infections such as impetigo can also precede acute rheumatic fever.
Not every child who develops strep throat will develop rheumatic fever. Genetic susceptibility, the particular strain of bacteria and environmental factors such as overcrowding can influence risk.
How does the infection cause rheumatic fever?
The exact mechanism is not completely understood. However, the leading explanation involves an abnormal immune response.
Certain components of Group A Streptococcus resemble proteins found in human tissues. After fighting the infection, the immune system may mistakenly react against tissues in the heart, joints, skin or nervous system. This phenomenon is often described as molecular mimicry.
This explains why the original sore throat may have disappeared before the symptoms of rheumatic fever begin.
What are the first signs of rheumatic fever?
The first signs can vary from one child to another. A child may initially develop:
- Fever
- Painful or swollen joints
- Joint tenderness
- Tiredness
- Chest discomfort
- Shortness of breath
- A fast or irregular heartbeat
The most characteristic joint problem is migratory arthritis, in which inflammation moves from one large joint to another. The knees, ankles, elbows and wrists are commonly affected.
Some children develop neurological symptoms called Sydenham chorea, which causes involuntary, irregular movements. Chorea may appear later than the other symptoms and, in some cases, can be the main or only manifestation of acute rheumatic fever.
What is the main symptom of rheumatic fever?
There is no single symptom that occurs in every patient. Fever and painful, inflamed joints—particularly migratory arthritis—are among the most common clinical features. Carditis, chorea and other manifestations can also occur.
Other symptoms of rheumatic fever
Rheumatic fever can affect multiple organ systems, so its symptoms can look quite different from one patient to another.
Joint symptoms
Arthritis is common and typically affects large joints such as the knees, ankles, elbows and wrists. The joints can become painful, swollen, warm and tender.
One characteristic feature is that the inflammation can move from one joint to another.
Heart symptoms
Carditis, or inflammation involving the heart, is one of the most important manifestations. It may cause:
- Chest pain
- Shortness of breath
- Fast heartbeat
- Fatigue
- A new heart murmur
- An enlarged heart
- Fluid around the heart
- Symptoms of heart failure
Carditis may sometimes be subclinical, meaning it is detected by echocardiography even when a typical murmur is not obvious on examination.
Neurological symptoms
Sydenham chorea causes sudden, involuntary and non-rhythmic movements. Children may also experience muscle weakness, difficulty with coordination and emotional changes.
Skin manifestations
Two classic skin findings are:
- Erythema marginatum — a painless, non-itchy rash with an expanding ring-like or serpiginous appearance, usually involving the trunk or proximal limbs.
- Subcutaneous nodules — small, firm, painless lumps, commonly found over bony or joint surfaces.
These findings are relatively uncommon but are important because they are considered major manifestations under the Jones criteria.
What are the Jones criteria for diagnosing rheumatic fever?
The Jones criteria are a clinical framework used to diagnose acute rheumatic fever. There is no single blood test, throat test or scan that independently confirms the disease. The diagnosis combines clinical findings with evidence of a preceding Group A strep infection.
The current approach uses the 2015 revised Jones criteria, which also recognizes echocardiographic evidence of subclinical carditis. The criteria differ somewhat depending on whether a person belongs to a low-risk or moderate/high-risk population.
Major Jones criteria
The major manifestations include:
- Carditis, clinical or subclinical
- Arthritis
- Sydenham chorea
- Erythema marginatum
- Subcutaneous nodules
In low-risk populations, arthritis as a major criterion is generally polyarthritis. In moderate- or high-risk populations, monoarthritis or polyarthritis may qualify as a major manifestation, and polyarthralgia may qualify when other causes have been excluded.
Minor Jones criteria
The minor criteria include:
- Joint pain or arthralgia
- Fever
- Elevated inflammatory markers such as ESR or CRP
- Prolonged PR interval on ECG, after accounting for age and provided carditis is not already being counted as a major criterion
The exact thresholds for fever and inflammatory markers vary according to the risk population.
How many Jones criteria are needed for rheumatic fever?
For a first episode of acute rheumatic fever, the revised Jones approach generally requires:
Two major criteria
OR
One major criterion + two minor criteria
There should also usually be evidence of a preceding Group A Streptococcus infection.
For a recurrent episode, the criteria can be somewhat different. A recurrence may be diagnosed with two major manifestations, one major plus two minor manifestations, or, in appropriate circumstances, three minor manifestations, together with evidence of preceding Group A strep infection.
There are important clinical exceptions. For example, Sydenham chorea or indolent carditis can sometimes support a presumptive diagnosis even when the usual criteria or laboratory evidence of preceding infection are absent.
Which finding is consistent with rheumatic fever?
Several findings are strongly consistent with rheumatic fever. Classic examples include:
- Migratory arthritis affecting large joints
- Carditis or new valvular regurgitation
- Sydenham chorea
- Erythema marginatum
- Subcutaneous nodules
- Fever with elevated inflammatory markers
- Evidence of a recent Group A strep infection
A child who develops painful, migratory large-joint arthritis several weeks after strep throat is a classic clinical scenario.
However, these findings are not individually enough to diagnose rheumatic fever. Doctors use the overall clinical picture and the Jones criteria.
What is the microbiology of rheumatic fever?
The organism associated with rheumatic fever is Streptococcus pyogenes, or Group A Streptococcus (GAS).
Microbiologically, S. pyogenes is a:
- Gram-positive coccus
- Usually arranged in chains
- Beta-hemolytic on blood agar
- Member of Lancefield Group A streptococci
It causes infections such as streptococcal pharyngitis, scarlet fever and impetigo.
An important point is that rheumatic fever itself is an immune-mediated disease rather than an active bacterial infection of the heart or joints.
What tests confirm rheumatic fever?
There is no single test that confirms acute rheumatic fever. Diagnosis is clinical and is supported by laboratory and cardiac investigations.
Doctors may order:
1. Blood tests
Blood tests can identify inflammation, including:
- ESR
- CRP
- Complete blood count in selected cases
Doctors may also look for evidence of a recent Group A strep infection by testing for streptococcal antibodies, such as antistreptolysin O (ASO) antibodies.
2. Throat testing
A throat swab can identify an active Group A strep infection. A rapid antigen test or throat culture may be used. However, the original throat infection may have disappeared by the time rheumatic fever develops, so a negative throat test does not necessarily rule it out.
3. ECG
An electrocardiogram can detect abnormalities such as a prolonged PR interval and can help evaluate the heart rhythm.
4. Echocardiogram
An echocardiogram is particularly important because it can identify clinical or subclinical carditis and valvular abnormalities. CDC guidance recommends routine echocardiography/Doppler assessment in suspected or confirmed acute rheumatic fever, even when a murmur is not heard.
How long does rheumatic fever last?
The duration varies depending on which organs are affected and how severe the illness is.
The acute inflammatory illness can last several weeks, while some manifestations may continue for several months. Joint inflammation generally improves with treatment, although symptoms can change or move between joints. Mayo Clinic notes that inflammation associated with rheumatic fever can persist from a few weeks to several months.
Sydenham chorea can last longer than some of the other symptoms.
The more important concern is not simply how long the initial fever or arthritis lasts. Recurrent episodes can cause cumulative damage to the heart valves, resulting in rheumatic heart disease, which can persist for many years.
What are the treatment guidelines for rheumatic fever?
Treatment has several goals:
- Eliminate any remaining Group A strep bacteria.
- Reduce inflammation and pain.
- Treat complications such as heart failure when present.
- Prevent future attacks.
Current CDC guidance recommends antibiotics for patients with acute rheumatic fever to eliminate residual Group A strep bacteria, regardless of whether the patient currently has a positive throat test or symptoms of pharyngitis. Anti-inflammatory medicines are used to control inflammation, fever and pain.
What is the first-line treatment for acute rheumatic fever?
Penicillin-based antibiotic therapy is the standard first-line approach for eradicating Group A Streptococcus. Depending on the clinical situation, penicillin may be given orally or as intramuscular benzathine penicillin.
The choice of antibiotic, dose and route should be determined by the treating clinician, particularly in children and in people with a history of penicillin allergy.
Anti-inflammatory treatment is also commonly used for arthritis and other inflammatory symptoms. Aspirin or other anti-inflammatory medicines may be used under medical supervision; aspirin should not be given to a child without specific medical advice. Corticosteroids may be considered in severe inflammation or significant carditis depending on the clinical situation.
Preventing another episode
Preventing recurrence is a crucial part of treatment. Children and adults who have had rheumatic fever may need long-term antibiotic prophylaxis, often involving regular benzathine penicillin injections or oral penicillin. The duration depends on factors such as whether heart involvement occurred and the patient’s individual risk. CDC notes that prophylaxis is usually indicated at least until age 21, with longer treatment often needed depending on the clinical history.
This preventive treatment is important because another episode of rheumatic fever can increase the risk of permanent heart valve damage.
Complications of rheumatic fever
The most serious long-term complication is rheumatic heart disease.
Repeated or severe inflammation can scar and deform the heart valves. The mitral valve is particularly commonly affected, although other valves can also be involved.
Potential complications include:
- Heart valve regurgitation
- Valve stenosis
- Heart failure
- Abnormal heart rhythms
- Stroke related to cardiac complications
- Need for valve surgery in severe disease
Rheumatic heart disease may become apparent years or even decades after the original episode of rheumatic fever.
Can rheumatic fever be prevented?
Yes. Prevention begins with recognizing and appropriately treating Group A strep infections.
Children with confirmed strep throat should receive the recommended antibiotic treatment and complete the prescribed course. Treating the original infection reduces the risk of acute rheumatic fever.
For someone who has already had rheumatic fever, regular secondary antibiotic prophylaxis is particularly important because subsequent Group A strep infections can trigger another attack.
Good hand hygiene and respiratory hygiene can also help reduce the spread of Group A strep infections.
When should a child see a doctor?
Parents should seek medical attention if a child develops symptoms of strep throat, particularly sudden sore throat, painful swallowing and fever. Prompt assessment is important because appropriate treatment of confirmed Group A strep infection can help prevent complications.
Medical evaluation is especially important if, several weeks after a throat infection, a child develops:
- Fever
- Swollen or painful joints
- Migrating joint pain
- Chest pain
- Shortness of breath
- A racing heartbeat
- Unusual involuntary movements
- Unexplained fatigue
- A characteristic rash
- Painless lumps beneath the skin
These symptoms do not necessarily mean the child has rheumatic fever, but they warrant professional evaluation.
Frequently Asked Questions About Rheumatic Fever
1. What causes rheumatic fever in children?
Rheumatic fever usually develops after an infection caused by Group A Streptococcus, especially strep throat. It results from an abnormal immune response to the infection rather than from bacteria directly infecting the joints or heart.
2. How long does rheumatic fever last?
The acute illness commonly lasts several weeks, although inflammation and certain manifestations can persist for several months. The duration depends on the organs involved and the severity of disease.
3. What are the diagnostic criteria for rheumatic fever?
The diagnosis is based on the revised Jones criteria. For an initial episode, the usual requirement is two major manifestations or one major plus two minor manifestations, together with evidence of a preceding Group A strep infection.
4. What tests confirm rheumatic fever?
There is no single confirmatory test. Doctors may use ESR and CRP, streptococcal antibody tests, throat testing, ECG and echocardiography. The overall clinical picture and Jones criteria are used to make the diagnosis.
5. What are the first signs of rheumatic fever?
Fever and painful or swollen large joints are common early manifestations. Migratory arthritis, fatigue and heart-related symptoms may also occur. Neurological symptoms such as Sydenham chorea can appear later.
6. What are the treatment guidelines for rheumatic fever?
Treatment generally includes antibiotics to eradicate Group A strep, anti-inflammatory medication to control symptoms, management of complications such as heart failure when necessary, and long-term antibiotic prophylaxis to prevent recurrence.
7. What are the Jones criteria for diagnosing rheumatic fever?
The Jones criteria divide manifestations into major and minor categories. Major manifestations include carditis, arthritis, chorea, erythema marginatum and subcutaneous nodules. Minor manifestations include fever, arthralgia, elevated inflammatory markers and prolonged PR interval, with some differences based on the patient’s risk population.
8. How many Jones criteria are needed for rheumatic fever?
For an initial episode, the usual requirement is two major criteria or one major plus two minor criteria, along with evidence of preceding Group A strep infection. Recurrent disease has additional diagnostic pathways.
9. Which finding is consistent with rheumatic fever?
Migratory arthritis of large joints, carditis, Sydenham chorea, erythema marginatum and subcutaneous nodules are classic findings. A recent Group A strep infection provides important supporting evidence.
10. What is the microbiology of rheumatic fever?
The underlying infection is caused by Streptococcus pyogenes, a Gram-positive, beta-hemolytic coccus belonging to Lancefield Group A. Rheumatic fever itself is an immune-mediated complication of that infection.
11. What is another name for rheumatic fever?
Rheumatic fever is also commonly called acute rheumatic fever (ARF). It should not be confused with rheumatic heart disease, which is the chronic cardiac damage that can result from rheumatic fever.
12. What is the first-line treatment for acute rheumatic fever?
A penicillin-based antibiotic is generally used to eradicate Group A Streptococcus, while anti-inflammatory treatment is used to control inflammation and symptoms. The specific antibiotic, dose and duration should be prescribed by a healthcare professional.
13. What is the main symptom of rheumatic fever?
There is no single symptom in every patient, but fever and painful, inflamed joints—often migratory large-joint arthritis—are among the most common manifestations.
Final thoughts
Rheumatic fever is an important example of why a seemingly ordinary streptococcal throat infection should not be ignored. The illness usually develops after the original infection and can affect several organs, particularly the joints and heart.
The diagnosis is clinical and relies heavily on the revised Jones criteria, supported by evidence of previous Group A strep infection and investigations such as blood tests, ECG and echocardiography. There is no single test that independently confirms rheumatic fever.
Early treatment of Group A strep infections, followed by appropriate secondary antibiotic prophylaxis when rheumatic fever has occurred, can play a major role in preventing recurrent attacks and protecting the heart.
If a child develops fever, migrating joint pain, chest symptoms or unusual involuntary movements several weeks after a suspected or confirmed strep infection, prompt medical assessment is important. Early recognition can make a significant difference, particularly when it comes to preventing long-term rheumatic heart disease.
This article is for general health information and should not replace evaluation and treatment by a qualified healthcare professional.
To consult a Doctor at Sparsh Diagnostic Centre, call our helpline number 9830117733.
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