10270
We present the case of an adult Crohn 's disease patient with a parvovirus B19 infection and leukopenia during long - term AZA therapy .
 leukopenia, AZA
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:
 leukopenia, AZA