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Although he made a successful comeback ( in television ) in the early 1970 s , his health was beginning to fail , as he had always expected , following bouts of rheumatic fever in childhood .
 rheumatic fever
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 rheumatic fever