In vitro antibiotic susceptibilities of ocular isolates in North and South America

Harold G. Jensen, Carlos Felix, Judith Bowersox, Alejandro Climent, James Dick, Jerard Osterhout, Pedro DiRocco, Regis P. Kowalski, Darlene Miller, Michael Osato, Hugh G. Robson, Frances Santorelli, A. E. Simor, Melvin Trousdale, W. Bruce Jackson, Joseph Yurack

Research output: Contribution to journalReview articlepeer-review


Purpose. To assess the in vitro susceptibility of ocular bacterial isolates from North and South America to antiinfectives that are commonly used in the treatment of external ocular infection. Methods. Ocular isolates (n = 1,291) from 12 laboratories in the United States, Canada, Mexico, and Argentina were tested for their susceptibility to ofloxacin, ciprofloxacin, norfloxacin, gentamicin, tobramycin, chloramphenicol, tetracycline, and erythromycin using both disk-diffusion and broth-dilution methods. Results. When the results from disk-diffusion and broth-dilution testing were combined, the relative overall in vitro efficacy was (in decreasing order): ofloxacin, ciprofloxacin, norfloxacin, gentamicin, chloramphenicol, tobramycin, tetracycline, and erythromycin. Against gram-positive organisms it was: ofloxacin, ciprofloxacin equivalent to chloramphenicol, norfloxacin, tetracycline, gentamicin, and erythromycin equivalent to tobramycin. Against gram-negative organisms it was: ofloxacin equivalent to ciprofloxacin and norfloxacin, gentamicin, tobramycin, chloramphenicol, and tetracycline comparable to erythromycin. Conclusions. The fluoroquinolones ofloxacin, ciprofloxacin, and norfloxacin had higher overall in vitro efficacy than the other antibiotics tested. Of the fluoroquinolones, ofloxacin had the highest in vitro efficacy against gram-positive organisms. All three fluoroquinolones were equivalent in efficacy against gram-negative organisms.

Original languageEnglish (US)
Pages (from-to)79-87
Number of pages9
Issue number1
StatePublished - Jan 1998
Externally publishedYes


  • Antibiotic susceptibility
  • Broad spectrum
  • Fluoroquinolones
  • In vitro
  • Keratitis
  • Ofloxacin
  • Resistanee
  • Susceptibility

ASJC Scopus subject areas

  • Ophthalmology


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