Does rheumatic fever spread?

Written by Li Jing
Rheumatology
Updated on August 31, 2024
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Firstly, rheumatic fever is a group of delayed sequelae caused by an infection of Group A Streptococci, simply put, it refers to a type of reactive arthritis that appears after an upper respiratory tract infection. It is associated with this streptococcus, and mostly occurs during the cold and humid seasons of winter and spring. It can affect people of any age, but is most commonly seen in children aged 5-14 and adolescents. Therefore, it is not a contagious disease, but rather a set of symptoms, such as fever and joint pain, appearing in individuals with weakened immune systems following an upper respiratory tract infection. Some people may even experience valvular heart disease. However, if treated actively in the early stages, the disease usually does not lead to any long-term consequences, unless it goes untreated or is treated under poor medical conditions, which may then result in rheumatic arthritis and rheumatic heart disease.

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Written by Yang Ya Meng
Rheumatology
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The difference between rheumatic fever and rheumatoid arthritis

The main difference between rheumatic fever and rheumatoid arthritis is that in addition to symptoms of arthritis, rheumatic fever also presents with elevated anti-streptolysin O levels and valvular heart disease, with some patients displaying subcutaneous erythema and chorea-like symptoms. Rheumatoid arthritis, on the other hand, primarily manifests as joint pain, and rarely involves heart valve issues. Additionally, rheumatoid arthritis is characterized by elevated rheumatoid factor, anti-CCP antibodies, and anti-AkA antibodies as its main clinical features. Patients with rheumatoid arthritis also exhibit increased inflammatory markers. The key differences between rheumatic fever and rheumatoid arthritis lie in the different antibodies involved and the general association of rheumatic fever with cardiac involvement.

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Written by Yang Ya Meng
Rheumatology
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Symptoms and Treatment of Rheumatic Fever

Patients with rheumatism often experience symptoms of upper respiratory tract infections in the early stages of the disease, such as fever and sore throat. Additionally, patients with rheumatism commonly exhibit migratory joint pain, primarily characterized by acute onset of redness, swelling, heat, pain, and limited mobility in the joints, but these can improve on their own. Patients with rheumatic fever often also suffer from carditis, which can include valvulitis, myocarditis, and pericarditis, with damage to the valves being the most common. Rheumatic fever may also present with ring-shaped erythema on the skin or subcutaneous nodules, and it can include chorea. The most common treatment for rheumatic fever is the intramuscular injection of penicillin. (Specific medication use should be carried out under the guidance of a doctor.)

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Written by Yang Ya Meng
Rheumatology
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What foods should not be eaten with rheumatic fever?

Patients with rheumatoid fever should avoid the following three major categories of foods: The first category is vegetables, such as celery, coriander, leeks, seaweed, and mushrooms, which should be consumed in moderation. The second category includes meats like lamb, beef, and dog meat, which are very warming and nourishing and should be reduced in consumption. The third category includes seafood such as shrimp, crab, and sea cucumber, which are high in protein and should also be avoided. For patients with rheumatism, the general dietary principle is to follow a light diet, avoid spicy and dry-heat foods, and reduce greasy foods. For patients with rheumatic fever, it is particularly important during the acute phase to rest and avoid catching colds and infections.

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Written by Yang Ya Meng
Rheumatology
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The Difference Between Rheumatic Fever and Rheumatoid Arthritis

Most patients with rheumatoid arthritis primarily exhibit symptoms related to the joints. Mainly affected are the symmetrical small joints of both hands, including both wrists, both palmar digital joints, and both proximal interphalangeal joints. In addition, patients with rheumatoid arthritis often have elevated rheumatoid factor, anti-CCP antibodies, and AKA antibodies. During the acute phase of joint disease, there is a marked increase in inflammatory markers, which is a major manifestation of rheumatoid arthritis. Patients with rheumatic fever, aside from joint pain, may also have heart valve disorders, such as mitral stenosis, and some patients may develop skin lesions, commonly erythema nodosum. Most importantly, patients with rheumatic conditions often show a significant increase in anti-streptolysin O.

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Written by Yang Ya Meng
Rheumatology
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What tests are needed for rheumatic fever?

The examinations for rheumatic fever include laboratory tests and electrocardiograms, as well as imaging studies. Laboratory tests include indicators of streptococcal infection, commonly using throat swab bacterial cultures, which have a positivity rate of about 20% to 25%. They also include anti-streptolysin O tests, generally considered positive if the titer is above 1:400. Secondly, the tests include those for acute inflammatory response, common markers of which are elevated erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP). Electrocardiograms help in detecting various arrhythmias, such as sinus tachycardia and prolonged PR interval. Echocardiography can be used to detect any abnormalities in the mitral valve of the heart.