alexa Antibiotic susceptibility of preoperative normal conjunctival bacteria.


Clinical Microbiology: Open Access

Author(s): Mio de Kaspar H, Koss MJ, He L, Blumenkranz MS, Ta CN

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Abstract PURPOSE: To determine the antibiotic susceptibility of preoperative conjunctival bacterial flora. DESIGN: In vitro study. METHODS: Antibiotic susceptibility of conjunctival bacterial strains isolated from 164 patients undergoing intraocular surgery was determined using the Kirby-Bauer disk-diffusion technique. RESULTS: Among the 162 bacteria isolated, 124 (76\%) were coagulase-negative staphylococci (CNS), with 2\% resistant to gatifloxacin and moxifloxacin, and none were resistant to vancomycin or minocycline. Other bacteria isolated were 19 Staphylococcus aureus (S. aureus), 8 Streptococcus Group D, and 11 gram-negative rods. Most S. aureus (>85\%) were susceptible to all antibiotics except for the penicillin and macrolide groups. No streptococci were resistant to gatifloxacin, levofloxacin, moxifloxacin, mezlocillin, imipenem, or vancomycin. None of the gram-negative rods were resistant to the fluoroquinolones. Approximately one half of all bacteria were resistant to erythromycin. One in three patients harbored multi-resistant bacteria (resistant to > or = five antibiotics). CONCLUSIONS: Newer-generation fluoroquinolones provide excellent broad-spectrum coverage against conjunctival bacterial flora. This article was published in Am J Ophthalmol and referenced in Clinical Microbiology: Open Access

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