Presentation of Case*A seven-year-old girl was admitted to the hospital because of fatigue.Four months previously a sore throat with a temperature of 104°F. that subsided after three days of penicillin therapy developed. Since then at weekly intervals there were temperature elevations to 103°F. associated with chilly feelings. On each occasion there was a good response to antibiotic therapy. One month before admission there was an episode of otitis media with cervical lymphadenopathy. An x-ray film of the chest a week before entry was said to have shown an enlarged heart and normal lungs. During the week before admission . . .