13707
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 .
 adverse effect: respiratory syncytial virus ( RSV ) infection, fludarabine phosphate
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 adverse effect: respiratory syncytial virus ( RSV ) infection, fludarabine phosphate