Emerging fluoroquinolone resistance in bacterial keratitis - A 5-year review

被引:317
作者
Goldstein, MH
Kowalski, RP
Gordon, YJ
机构
[1] Univ Florida, Coll Med, Dept Ophthalmol, Gainesville, FL 32610 USA
[2] Univ Pittsburgh, Inst Eye & Ear, Pittsburgh, PA 15213 USA
关键词
D O I
10.1016/S0161-6420(99)00716-2
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Objective: To identify resistance patterns to the fluoroquinolones for patients with bacterial keratitis. Design: Retrospective observational case series, Participants: All cases of bacterial keratitis presenting to the Charles T. Campbell Ophthalmic Microbiology Laboratory at the Eye and Ear Institute of Pittsburgh from January 1993 to December 1997 were reviewed, A total of 1053 ocular isolates from 825 cases of bacterial keratitis were identified, Main Outcome Measures: In vitro laboratory susceptibility testing of ocular isolates to ciprofloxacin and ofloxacin was determined by the Kirby-Bauer disk diffusion method and interpreted using the National Committee for Clinical Laboratory Standards serum standards. Results: The number of cases of bacterial keratitis per year decreased from 284 in 1993 to 75 in 1997, The ratio of gram-positive to gram-negative organisms changed from 81.8%:18.2% in 1993 to 51.4%:48.6% in 1997 (chi-square, 66.00; degrees of freedom, 4; P < 0.000001), Resistance of Staphylococcus aureus to ciprofloxacin significantly increased annually from 5.8% in 1993 to 35.0% in 1997 (chi-square, 19.80; degrees of freedom, 4; P < 0.0001) and for ofloxacin from 4.7% to 35.0% over the same period (chi-square, 21.32; degrees of freedom, 4; P < 0.001). Streptococcus species and coagulase-negative Staphylococcus species showed significant resistance to both fluoroquinolones but no change in resistance over the study period, The gram-negative organisms showed good susceptibility to the fluoroquinolones. Conclusions: This in vitro study shows a significant increased resistance of S. aureus to the fluoroquinolones from 1993 to 1997, In addition, gaps in fluoroquinolone coverage for Streptococcus and coagulase-negative Staphylococcus species raise concern for the use of monotherapy in treating bacterial keratitis, Contrary to what might be expected, the distribution of gram-positive to gram-negative organisms has shifted, with a decrease in the number of gram-positive organisms identified, while the number of gram-negative isolates has remained stable.
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页码:1313 / 1318
页数:6
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