Changes of Causative Organisms and Antimicrobial Sensitivity of Urinary Tract Infection between 1979 and 2001

Ko, Young Hwii; Oh, Jae Sang; Cho, Dae Youn; Bea, Jea Hyun; Koh, Sung Kun

Abstract

PURPOSE: We studied the changes in the antibiotic sensitivity to the causative organisms of urinary tract infection, between 1979 and 2001, in order to provide useful information on the choice of adequate drugs in the treatment of urinary tract infection (UTI).
MATERIALS AND METHODS
We retrospectively analysed 1,370 uropathogens, and their antimicrobial sensitivities, in 647 patients admitted to, or visiting our hospital, between January 1979 and December 2001, that had more than 105cfu/ml in urine culture.
RESULTS
The incidence of UTI increased with age, and was highest in the 6th decades (21.0%). Mixed infections increased from 6.1%, in 1979, to 18.4%, by 2001. The common pathogens were E. coli (37.8%), enterococcus (15.0%), Pseudomonas (10.1%) and Klebsiella (9.1%). E. coli was the most important uropathogen during the stated time period. However, the incidence of Gram positive organisms increased from 14.2%, in 1979, to 26.0%, by 2001. In the Gram negative stained uropathogens, the antibiotic sensitivity was changed: ampicillin (11.8 to 14.6%), cephalothin (40.6 to 46.3%) and amikacin (80.5 to 74.8%). For E. coli, trimethoprim/Sulfamethoxazole (TMP/SMX) and ampicillin showed decreased sensitivities of 37.3 and 18.5%, respectively. However, sulbactam/cefoperazone, cefepime and imipenem showed high sensitivities of 96.1, 97.5 and 100%, respectively.
CONCLUSIONS
Prior to receiving the bacteriological report, the use of TMP/SMX and ampicillin, as the first choices of treatment for UTI, should be reconsidered. Our results implied that amikacin, which showed the best effects, and was cheaper than fluoroquinolones, can be used as an alternative to these drugs as a primary empirical antibiotic for UTI.