Adhésion bactérienne aux implants intraoculaires et prévention de l'endophtalmie

Change in Nationwide Incidence of Post-Cataract Surgery Endophthalmitis: Korean Cohort Study from 2002 to 2013

Purpose: To investigate the change in nationwide incidence of endophthalmitis following cataract surgery in Korea from 2002 to 2013. Methods: From a national sample cohort (n = 1 025 340), cases of postoperative endophthalmitis between 2002 and 2013 were identified. Results: From 70,719 cases of cataract surgery, 49 incidents of endophthalmitis were reported, yielding an incidence of 0.069% (95% confidence interval [CI], 0.051-0.092%). Overall, the endophthalmitis incidence decreased from 0.103% in 2002-2005 to 0.045% in 2010-2013, corresponding to an annually decreasing time-trend (0.902, 95% CI, 0.827-0.984). In diabetic patients, however, the incidence was 0.128% and did not change (time trend, 1.015; 95% CI, 0.828-1.245). Conclusions: This study revealed the incidence of endophthalmitis decreased during a 12-year period, but remained constant in diabetic patients.

DNA extraction methods for panbacterial and panfungal PCR detection in intraocular fluids

PURPOSE

Three different methods of DNA extraction from intraocular fluids were compared with subsequent detection for bacterial and fungal DNA by universal PCR amplification.

MATERIAL AND METHODS

Three DNA extraction methods, from aqueous and vitreous humors, were evaluated to compare their relative efficiency. Bacterial (Gram positive and negative) and fungal strains were used in this study: Escherichia coli, Staphylococcus epidermidis and Candida albicans. The quality, quantification, and detection limit for DNA extraction and PCR amplification were analyzed. Validation procedures for 13 aqueous humor and 14 vitreous samples, from 20 patients with clinically suspected endophthalmitis were carried out.

RESULTS

The column-based extraction method was the most time-effective, achieving DNA detection limits ≥10(2) and 10(3 )CFU/100 µL for bacteria and fungi, respectively. PCR amplification detected 100 fg, 1 pg and 10 pg of genomic DNA of E. coli, S. epidermidis and C. albicans respectively. PCR detected 90.0% of the causative agents from 27 intraocular samples collected from 20 patients with clinically suspected endophthalmitis, while standard microbiological techniques could detect only 60.0%. The most frequently found organisms were Streptococcus spp. in 38.9% (n = 7) of patients and Staphylococcus spp. found in 22.2% (n = 4).

CONCLUSIONS

The column-based extraction method for very small inocula in small volume samples (50-100 µL) of aqueous and/or vitreous humors allowed PCR amplification in all samples with sufficient quality for subsequent sequencing and identification of the microorganism in the majority of them.