Urinary tract infections are a common problem seen in both the outpatient and inpatient setting. For community-acquired UTIs, (KEEPS) is a helpful mnemonic to remember the common pathogens:
E. coli (~80%)
Proteus mirabilis (5%)
S. saphrophyticus (5-10%)
NOTE: in the hospital, remember to consider: Pseudomonas, Serratia and Staph aureus!!!