= Solution
\b[The typical childhood picture is <Sydenham's chorea>: irregular involuntary movements, impaired sustained voluntary actions, variable weakness and emotional disturbance.] A hypothetical schoolchild might gradually become unusually clumsy, drop utensils, spill drinks and produce deteriorating handwriting. Unpredictable movements pass between the face, trunk and limbs, giving facial grimaces and an unsteady gait. The <chorea> may be asymmetric. Asking the child to maintain a handgrip can reveal alternating tightening and relaxation; an outstretched hand or protruded <tongue> may not remain still. These are examples of <motor impersistence>, not wilful disobedience. Speech and feeding can become difficult. Marked weakness may accompany severe <chorea>. Anxiety or emotional lability may be conspicuous. This is a pattern to look for, not a claim that the unspecified person in the question has any particular finding.<Clinical Guidance for Acute Rheumatic Fever by CDC>[Clinical features, Chorea; abrupt nonrhythmic movements, muscle weakness and emotional lability]{ref}<Australian guideline for acute rheumatic fever and rheumatic heart disease (2025)>[Chapter 7, Table 7.6, functional impairment and motor impersistence]{ref}
An 1867 account would associate childhood <chorea> with the period around puberty, preceding “rheumatism”, fright and general debility. It might also investigate supposed peripheral irritants such as <intestinal parasites>. These explanations were not equally secure. Fright could precede or aggravate the visible movements without establishing their fundamental cause, and finding <intestinal parasites> did not prove that they caused the <chorea>. Contemporary discussion already recognized spontaneous recovery and disputed whether reported drug cures exceeded it.<On Chorea, and on Nature and Art in the Treatment by James Turnbull>[1865, pp. 32–35, age and sex distribution, attributed triggers, mineral tonics and debate over spontaneous recovery]{ref}
A reasonable historical treatment outline begins with quiet surroundings, rest, adequate food, assistance with feeding and protection from injury in violent <chorea>. Genuine associated illness, including <anaemia>, required attention. Preparations of <iron> were common “tonics”; other remedies of the period included experimental mineral drugs. Their use should be reported as historical practice, not as an effective modern recipe. A recovery after weeks of treatment does not distinguish a pharmacological effect from the natural course of <Sydenham's chorea>.<On Chorea, and on Nature and Art in the Treatment by James Turnbull>[1865, discussion of diet and regimen, preparations of iron and the evidential problem of therapeutic claims]{ref}
\b[Modern correction: the usual cause of the classic childhood syndrome is an immune-mediated consequence of preceding group A <streptococcal infection>, not fright, moral weakness or an intestinal “irritation”.] <Sydenham's chorea>, named after <Thomas Sydenham>, can be the sole late manifestation of <acute rheumatic fever>. Assess for <carditis> even without an obvious <heart murmur>: <echocardiography> can reveal otherwise silent valve disease. Treat residual group A <streptococcal infection> and institute appropriate secondary <antibiotic prophylaxis>; these measures prevent further attacks rather than instantly stopping established movements.<Clinical Guidance for Acute Rheumatic Fever by CDC>[Central nervous system manifestations; subclinical carditis; Antibiotics; Prevention of recurrent attacks]{ref}
Management varies with function. Mild <Sydenham's chorea> may need supportive measures alone. When eating, walking or self-care is substantially impaired, specialist care can add a movement-suppressing drug such as <carbamazepine>. Severe disease may justify <corticosteroid> treatment; very severe or refractory disease may need further specialist <immunotherapy>. Evidence and practice differ between guidelines, and improvement is not necessarily immediate. <sodium valproate> is another option in selected circumstances, but its reproductive and other adverse effects are material limitations.<Australian guideline for acute rheumatic fever and rheumatic heart disease (2025)>[Chapter 7, Anticonvulsant agents, Corticosteroids for chorea and Table 7.6]{ref}<Evaluation, Diagnosis, and Treatment of Sydenham Chorea: Consensus Guidelines (2025)>[Recommendations 8.5–8.10 and 9.1–9.4; immunotherapy and symptomatic treatment]{ref} Atypical onset, progression, exposure to relevant drugs or other focal <neurological signs> calls for reconsideration of the cause of the <chorea>, rather than automatic assignment to <acute rheumatic fever>.
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