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We report here on a heretofore undescribed respiratory syncytial virus ( RSV ) infection in a patient with a long - standing history of refractory CLL that was treated with fludarabine phosphate .
 respiratory syncytial virus ( RSV ) infection, fludarabine phosphate
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 respiratory syncytial virus ( RSV ) infection, fludarabine phosphate