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Coagulase-negative Staphylococcus most frequently found conjunctival bacteria before phaco

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FORT LAUDERDALE, Fla. — The most frequent etiology for postoperative infectious endophthalmitis, coagulase-negative Staphylococcus, was also the most frequently found bacteria in the conjunctival flora before cataract surgery, according to a study.

Gonzalo Varas and colleagues presented results of a prospective study in a poster presentation at the Association for Research in Vision and Ophthalmology meeting here. They examined 100 samples from 100 patients who were swabbed on the lower fornix and tested for microorganisms and sensitivity to antibiotics of the conjunctival flora before phacoemulsification.

In those samples, they found that the most frequent microorganism, accounting for 67% of positive cultures, was coagulase-negative Staphylococcus. For "antibiotic sensitivity for each antibiotic," vancomycin was 100%; chloramphenicol, cephazolin and tobramycin were 98%; moxifloxacin was 94.1%; gentamicin was 94%; gatifloxacin was 88.2%; and ciprofloxacin was 86.3%.

"We found coagulase-negative Staphylococcus was the most prevalent bacteria in the conjunctival flora in accordance to the literature," the researchers said.