Longitudinal trends in fluoroquinolone resistance among Enterobacteriaceae isolates from inpatients and outpatients, 1989-2000: differences in the emergence and epidemiology of resistance across organisms.
We conducted a 12-year study to identify and compare trends in annual prevalence of fluoroquinolone (FQ) resistance among Enterobacteriaceae isolates obtained from inpatients and outpatients in our health care system. A total of 46,070 clinical Enterobacteriaceae isolates underwent susceptibility testing. Although there were significant increases in inpatient FQ resistance for all Enterobacteriaceae, FQ resistance trends differed significantly across Enterobacteriaceae (P<.001). For isolates obtained from outpatients, only Escherichia coli and Proteus mirabilis demonstrated significant increases in FQ resistance (P<.001 for each). Trends in outpatient FQ resistance also differed significantly across Enterobacteriaceae (P<.001). There were significant differences between inpatient and outpatient FQ resistance trends for all Enterobacteriaceae except P. mirabilis and Enterobacter cloacae. Although hospital-wide use of certain antibiotics correlated significantly with inpatient FQ resistance, these correlations differed substantially across organisms. Efforts to elucidate the epidemiology of FQ resistance and identify targets for intervention must recognize and account for the variability of FQ resistance across organisms and clinical settings.
Lautenbach
Ebbing
E
Division of Infectious Diseases, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6021, USA. elautenb@cceb.med.upenn.edu
Strom
Brian L
BL
Nachamkin
Irving
I
Bilker
Warren B
WB
Marr
Ann Marie
AM
Larosa
Lori A
LA
Fishman
Neil O
NO
D000890:Anti-Infective Agents / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D004363:Drug Utilization; D004926:Escherichia coli / Q000187:drug effects* / Q000302:isolation & purification; D024841:Fluoroquinolones / Q000494:pharmacology*; D006801:Humans; D007297:Inpatients; D008826:Microbial Sensitivity Tests; D010045:Outpatients; D015995:Prevalence; D011513:Proteus mirabilis / Q000187:drug effects* / Q000302:isolation & purification
D000890:Anti-Infective Agents; D024841:Fluoroquinolones