title: In vitro adhesion of Staphylococcus epidermidis to intraocular lenses.
abstract: OBJECTIVE
  To compare the in vitro adherence of slime-producing and non-slime-producing Staphylococcus epidermidis to different intraocular lenses (IOLs) to study the organism's contribution to postoperative endophthalmitis.
  
  
  METHODS
  Strains of slime-positive (ATCC 35984) and slime-negative (ATCC 12228) S epidermidis were used. The IOLs were made of poly(methyl methacrylate) (PMMA), PMMA with polypropylene haptics, silicone, hydrogel, acrylic, heparin-surface-modified (HSM) PMMA, and fluorine-surface-modified PMMA. The lenses were incubated overnight with bacteria, then sonicated and vortexed to separate the adhered bacteria. Quantitative cultures were performed and the results statistically analyzed.
  
  
  RESULTS
  Slime-negative strains of S epidermidis adhered to all IOLs but at a lower level than slime-positive strains. The most adherent lenses were acrylic with the positive strain and PMMA with the negative strain. The least adherent IOLs were PMMA with the positive strain and hydrogel with the negative strain. There were no significant differences between rigid and foldable lenses. Polypropylene was significantly more adherent than PMMA to the slime-positive strain. The acrylic and the HSM PMMA IOLs were significantly more adherent to the positive strain.
  
  
  CONCLUSIONS
  In vitro, there were significant differences in bacterial adhesion among IOL materials. Slime-positive strains of S epidermidis were more adherent than slime-negative ones.
authors.affiliation: Fundación Hospital de Alcorcón, Madrid, Spain. mcgarcias@fhalcorcon.es
authors.forename: M C
authors.initials: MC
authors.lastname: García-Sáenz
authors.forename: A
authors.initials: A
authors.lastname: Arias-Puente
authors.forename: M J
authors.initials: MJ
authors.lastname: Fresnadillo-Martinez
authors.forename: A
authors.initials: A
authors.lastname: Matilla-Rodriguez
mesh_terms: D001422:Bacterial Adhesion; D001672:Biocompatible Materials; D015169:Colony Count, Microbial; D009877:Endophthalmitis / Q000382:microbiology; D015818:Eye Infections, Bacterial / Q000382:microbiology; D006801:Humans; D066298:In Vitro Techniques; D007910:Lenses, Intraocular / Q000382:microbiology*; D019904:Polymethyl Methacrylate; D012826:Silicone Elastomers; D013203:Staphylococcal Infections / Q000382:microbiology; D013212:Staphylococcus epidermidis / Q000502:physiology*; D013530:Surgical Wound Infection / Q000382:microbiology
chemical_list: D001672:Biocompatible Materials; D012826:Silicone Elastomers; D019904:Polymethyl Methacrylate