P, an Indonesian boy, 5 years old, 15 kg of body weight and 110 cm of body length, was admitted to the PTP IX Hospital on March 30, 1987 with cerebral palsy. The patient had fever since 10 days before admission which lasted 7 days; he showed restlessness by involuntary movements when catching, thus when holding something in his hand, it fell off. He had difficulty in walking and talking. On physical examination, were hyperemic the tonsils and pharynx; there was muscular hypotonia, flexed arms and metacarpophalangeal extension. Laboratory findings showed leukocytosis, increased ASTO titer, positive CRP and normal cerebral spinal fluid. Head CT scan showed no abnormality. Electrocardiogram and EEG were in normal limits. Throat swab culture produced Group A Streptococcus beta hemolyticus. The diagnosis of sydenham's chorea was established. Procaine penicillin, phenobarbital and vitamins were administered to the patient. After 5 weeks in the ward the patient was doing well, and now he is working and speaking normally; he is on ambulatory treatment with 1.2 million units/month of long-acting benzathine penicillin, at the Department of Child Health, Tembakau Deli Hospital, Medan.