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24 strains of E. coli were recognized to have urease activities(0.20-0.70 urea mole/min./㎖ media) in tested 54 strains isolated from Kyung Hee University Hospital inpatients of urinary tract infection. 24 strains of urease activities and 30 strains of urease inactivities were studied on resistant rates against gentamicin(GM), amikacin(AMK), ampicillin(AMP), cefotaxime(CTX), moxalactam(MOX), minocycline(MN), ciprofloxacin(CIP)and fosfomycin(FOF). Strains of urease inadtivities were observed to show resistance 66.7％ to AMP. 20.0％ to GM 3.3％ to AMK, CTX and MOX, 16.7％ to MN, and 6.7％ to CIP and FOF. On the other hand, resistance of strains of urease activities were indicated more than strains of urease inactivities, ad resistant rates 100％ to AMP, 54.2％ to GM, 41.6％ to AMK, 33.3％ to CTX and MOX, 24.2％ to MN, 16.7％ to CIP, and 25.0％ to FOF.
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