It is unusual for adults to develop Sydenham’s chorea.  But it is certainly true that children who had it can have problems that persist into adulthood, and to have further episodes of chorea.

Long term neuropsychiatric difficulties after childhood  Sydenham’s chorea are increasingly recognised – these include obsessive-compulsive disorder but also Attention-deficit-hyperactivity disorder (ADHD), mood disorders, and tics. [Michael Morton and Nadine Mushet 2016] 

Heart involvement, in people whose Sydenham’s chorea was part of rheumatic fever, improved in about a third of cases from Turkey. [Ekici 2012]

See Fraser’s great talk at our Education Event in 2021: