OBJECTIVES To investigate phenotypically and genotypically the presence of MDR efflux pumps in 21 clinical isolates of Staphylococcus haemolyticus collected over a period of 10 years. METHODS MICs of different antibiotics and biocides were determined by the broth dilution method in the presence/absence of carbonyl cyanide-m-chlorophenylhydrazone (CCCP), an efflux pump inhibitor. PCR followed ...

Long-term use of topical drugs has clearly been shown to induce toxic immunopathological changes in the ocular surface. Lacunae exist in the knowledge regarding the respective roles of active compounds and preservatives. The preservatives used in topical multidose ophthalmic preparations are responsible for a considerable compromise of ocular surface. In chronic diseases like glaucoma where lon...

The adaptation mechanism of Pseudomonas aeruginosa ATCC 10145 to quaternary ammonium compounds (QACs) was investigated. A P. aeruginosa strain with adapted resistance to QACs was developed by a standard broth dilution method. It was revealed that P. aeruginosa exhibited remarkable resistance to N-dodecylpyridinium iodide (P-12), whose structure is similar to that of a common disinfectant, cetyl...

Preservatives in ophthalmic solutions have long been known to cause toxic effects on the cornea. The most frequently used preservative in eye drops, and one that has among the highest toxicity, is benzalkonium chloride (BAC)[1-3]. This quarternary ammonium has been shown to have a variety of pathological effects, including tear film instability, conjunctival squamous metaplasia, breakdown of co...

PURPOSE To investigate whether optimized photoactivated chromophore for keratitis-corneal collagen cross-linking (PACK-CXL) treatment settings allow accelerating treatment while maintaining antibacterial efficacy. METHODS Staphylococcus aureus and Pseudomonas aeruginosa strains were irradiated with ultraviolet-A light of equal fluence but different intensity settings (18 mW/cm² for 5 minutes ...