Sydenham's chorea is a major manifestation of Acute Rheumatic fever. It occurs late i.e. 6-8 weeks after acquiring the infection. It never occur simultaneously with arthritis of rheumatic fever.
Incidence is around 0.5-2 patients/1 lakh. In acute rheumatic fever it can occur in around 20% patients. On an average it resolves itself within 3-5 months & rarely lasts more than 1 year.
As I said 20% of patients with acute rheumatic fever will develope it & not all the patients.
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