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By Mayo Clinic staffRheumatic fever is an inflammatory disease that can develop as a complication of untreated or poorly treated strep throat. Strep throat is caused by infection with group A streptococcus bacteria.
Rheumatic fever is most common in 5- to 15-year-old children, though it can develop in younger children and adults. Recurring episodes of rheumatic fever most often affect people when they are about 25 to 35 years of age.
Although it's relatively rare in United States and other developed countries, rheumatic fever remains common in many developing nations.
Rheumatic fever can cause permanent damage to the heart that may result in serious harm to the heart valves and heart failure. Treatments can reduce tissue damage from inflammation, lessen pain and other symptoms, and prevent the recurrence of rheumatic fever.
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