Complicated UTI includes:
→ Uncomplicated: UTI without underlying renal/neurologic disease. 
→ Complicated: UTI with underlying structural, medical, neurologic disease. 
→ Recurrent: >3 Symptomatic UTIs within 12 months following clinical therapy. 
→ Reinfection: Recurrent UTI caused by a different pathogen at any time. 
→ Relapse: Recurrent UTI caused by same species causing original UTI, within 2 weeks after therapy.
UTI without underlying renal/neurologic disease
UTI with underlying structural, medical, neurologic disease
> 3 Symptomatic UTIs within 12 months following clinical therapy
Recurrent UTI caused by a different pathogen at any time