Respected user , Hi
Thanks for using Healthcaremagic.com
I have evaluated your query thoroughly .
*  There are various causes of urinary infection after PCNL
    -  DJ 
stent working as foreign body , giving more chances as nidus of
        infection  via  bacteria  loading over it .
    -  Inadequate  fluid  intake  
    -  Resistant  bacteria  as in  your  case  .
*  Usually  it  is  around  3 - 4 weeks  period  by  which  we  recommend  
    DJ stent  removal  after  PCNL , so it is the   right  time  to  discuss 
    with  your  doctor  for  the  same .
Hope this will help you .
Welcome for further  guidelines .
Regards dear .