Effect of topical netilmicin on the reduction of bacterial flora on the human conjunctiva.

PURPOSE: To investigate the effects of topical netilmicin on human conjunctival bacterial flora. METHODS: Fifty-six patients' eyes with cataract were treated three times a day with netilmicin 1 day before the surgery. The fellow eyes of the patients were not treated. After 1 day of netilmicin application cultures of the inferior palpebral conjunctiva were performed in both eyes. Bacterial evaluation is qualitative. McNemar test was used for statistical analyses. RESULTS: The number of eyes with positive culture for coagulase negative staphylococcus (CNS) in untreated eyes was 43 (76.8%) and in treated eyes it was 5 (8.93%) and the difference was statistically significant (p=0.000). In untreated eyes number of negative cultures with no bacterial growth was 8 (14.3%) and it was 47 (83.9%) in the treated eyes. The difference among groups was statistically significant (p=0.000). Netilmicin is found very effective for CNS as the percentage of positive cultures (n=43) in untreated eyes to positive cultures (n=4) in the treated fellow eye was 90.7%. Likewise, all patients with Staphylococcus aureus positive cultures in untreated eyes (n=5) had negative culture for this microorganism in their treated fellow eyes (100%). CONCLUSIONS: The Endophthalmitis Vitrectomy Study demonstrated that the most common causes of postoperative endophthalmitis are coagulase negative microorganisms, S aureus and Streptococcus species. As netilmicin was found effective to reduce the number of positive cultures for these bacteria, it can be used to lower the incidence of postoperative endophthalmitis before surgery.

Five-year surveillance of nosocomial infections in Ankara Training and Research Hospital.

The objective of this study was to assess the rate of nosocomial infections (NIs), frequency of nosocomial pathogens and antimicrobial susceptibility changes in a 530-bed hospital over a five-year period. Hospital-wide laboratory-based NI surveillance was performed prospectively between 1999 and 2003. The Centers for Disease Control and Prevention's definitions were used for NIs and nosocomial surgical site infections, and NI rates were calculated by the number of NIs per number of hospitalized patients on an annual basis. NI rates ranged between 1.4% and 2.4%. Higher rates were observed in the neurology, neurosurgery, paediatric and dermatology departments; the low rate of NIs overall may be due to the surveillance method used. The most commonly observed infections were urinary tract, surgical site and primary bloodstream infections, and the most frequently isolated pathogens were Escherichia coli, Klebsiella pneumoniae, Enterococcus spp. and Staphylococcus aureus. Carbapenems were the most effective agents against enterobacteriaceae. Meticillin resistance among S. aureus isolates was less than 50%, and all S. aureus and Enterococcus spp. isolates were susceptible to glycopeptides apart from one glycopeptide-resistant E. faecium isolate identified in 2003. Data obtained by the same method enabled comparison between years and assisted in the detection of recent changes. Antimicrobial susceptibility data on nosocomial pathogens provided valuable guidance for empirical antimicrobial therapy of NIs.