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Chorea is the movement disorder described. It features rapid, irregular, involuntary jerks that seem dance-like and can flow from one body part to another. Sydenham chorea is an autoimmune complication after streptococcal infection, causing choreiform movements, especially in children. Huntington's disease also presents with chorea due to degeneration in the striatum that disrupts inhibitory pathways to the thalamus, leading to excessive, involuntary movements alongside cognitive and behavioral changes. The other options describe different patterns: tics are repetitive and often suppressible; tremor is rhythmic and oscillatory; dystonia involves sustained, abnormal postures from muscle contractions. So chorea best fits the described causes.