Medicine – Revised Jones Criteria for the Diagnosis of Acute Rheumatic Fever

The Jones criteria are used to support the diagnosis of acute rheumatic fever (ARF), an immune-mediated inflammatory complication that may occur following infection with group A β-haemolytic Streptococcus (GAS). The manifestations are traditionally divided into major and minor criteria. In most initial episodes, diagnosis requires an appropriate combination of these manifestations together with evidence of a preceding group A streptococcal infection.

Major Criteria

1. Carditis

Carditis is one of the most important manifestations of acute rheumatic fever because it can result in permanent valvular heart disease. Inflammation may involve the endocardium, myocardium, and pericardium, although valvulitis is particularly significant. The mitral valve is most commonly affected, with the aortic valve sometimes involved as well. Patients may develop a new cardiac murmur, tachycardia, cardiomegaly, heart failure, or pericardial inflammation. Modern criteria also recognise subclinical carditis detected by echocardiography.

2. Polyarthritis

Acute rheumatic fever classically causes an acute migratory polyarthritis, predominantly involving the large joints. The knees, ankles, elbows, and wrists are commonly affected. Inflammation may improve in one joint while appearing in another, producing the characteristic migratory pattern. The affected joints are usually painful, swollen, warm, and restricted in movement, but permanent joint destruction is uncommon.

3. Chorea

Sydenham chorea is a neurological manifestation characterised by involuntary, rapid, irregular, and purposeless movements. Patients may also develop emotional instability, behavioural changes, poor coordination, and deterioration in handwriting. Chorea can appear several months after the original streptococcal infection and may occasionally occur when other manifestations of acute rheumatic fever have already disappeared.

4. Erythema Marginatum

Erythema marginatum is a characteristic but relatively uncommon skin manifestation. It consists of a non-pruritic, erythematous rash with serpiginous or ring-shaped margins and central clearing. The rash generally occurs on the trunk and proximal parts of the limbs and usually spares the face. Individual lesions may appear and disappear rapidly.

5. Subcutaneous Nodules

Subcutaneous nodules are small, firm, painless nodules that usually develop over bony prominences, extensor surfaces, tendons, or the spine. They are uncommon but are strongly associated with rheumatic carditis when present. The nodules usually persist for a limited period and resolve as the underlying inflammatory process improves.

Minor Criteria

1. Fever

Fever is a common systemic manifestation of acute rheumatic fever and reflects the underlying inflammatory response. The precise temperature threshold used as a minor criterion varies according to whether the patient belongs to a population considered at low or moderate-to-high risk for acute rheumatic fever.

2. Arthralgia

Arthralgia refers to joint pain without the objective inflammatory changes required to diagnose arthritis. The pattern of arthralgia considered a minor manifestation also varies according to the patient’s underlying population risk. Importantly, the same joint manifestation should not normally be counted simultaneously as both a major and a minor criterion.

3. Other Minor Criteria

Current Jones criteria also include laboratory and electrocardiographic findings among the minor manifestations. These include elevated inflammatory markers, such as ESR or C-reactive protein (CRP), and prolongation of the PR interval on ECG, provided carditis is not already being counted as a major manifestation.

A previous history of rheumatic fever or established rheumatic heart disease was included as a minor feature in older versions of the Jones criteria, but it is not listed as a minor criterion in the current revised criteria. Instead, previous rheumatic fever or rheumatic heart disease affects the criteria used to diagnose a recurrent attack.

Evidence of Recent Streptococcal Infection

In addition to the clinical criteria, there should usually be evidence of a preceding group A streptococcal infection. This may be demonstrated by an elevated or rising antistreptolysin-O (ASO) titre, other elevated streptococcal antibody titres, a positive throat culture for group A Streptococcus, or a positive rapid antigen test.

An important distinction is that ASO/ASOT is a blood antibody test, whereas a throat culture directly detects group A streptococci. They are therefore separate forms of evidence for preceding streptococcal infection.

Diagnostic Combination

For a first episode of acute rheumatic fever, the usual diagnostic requirement is:

Two major criteria, or one major plus two minor criteria, together with evidence of a preceding group A streptococcal infection.

The current revised Jones criteria also distinguish between low-risk and moderate-/high-risk populations, with slightly different definitions for some joint manifestations, fever, and inflammatory-marker thresholds. In addition, there are specific criteria for diagnosing recurrent acute rheumatic fever in patients with a previous history of rheumatic fever or rheumatic heart disease.