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Title: Prevalence of antiseptic-resistance genes in Staphylococci isolated from Orthokeratology lens and spectacle wearers in Hong Kong
Authors: Shi, GS
Boost, M
Cho, P 
Keywords: Staphylococci
Antiseptic resistance genes
Periorbital tissues
Issue Date: 2015
Publisher: Association for Research in Vision and Ophthalmology
Source: Investigative ophthalmology and visual science, 2015, v. 56, no. 5, p. 3069-3074 How to cite?
Journal: Investigative ophthalmology and visual science 
Abstract: PURPOSE. To compare isolation of staphylococci from periorbital tissues and accessories of orthokeratology (ortho-k) lens and spectacle wearers and investigate prevalence of antiseptic-resistance (QAC) genes. To determine minimum inhibitory concentrations (MIC) of antiseptics and antibiotic susceptibility of isolates. METHODS. Staphylococci were isolated from eyelids, eyelashes, and conjunctival sacs of 23 ortho-k lens wearers and 20 spectacle wearers. Samples were also collected from ortho-k lenses, lens cases, and spectacle frames. Isolations of Staphylococcus aureus were compared between ortho-k subjects and controls for all samples and for coagulase-negative staphylococci (CNS) from conjunctival sacs. QAC genes were amplified in 110 Staphylococcus aureus and 59 CNS isolates and prevalence compared in isolates from ortho-k lens and spectacle wearers. Associations were assessed between presence of QAC genes and antibiotic and antiseptic susceptibility. RESULTS. Although isolation of Staphylococcus aureus did not differ significantly in periorbital samples from ortho-k and control subjects, QAC genes were significantly more common in both Staphylococcus aureus and CNS from ortho-k subjects (odds ratio 4.4 and 10.74, respectively). Overall, qacA/B was the predominant gene detected, being present in 26.5% CNS and 11% Staphylococcus aureus. smr and qacH were present in 12% of CNS, but were less common in Staphylococcus aureus. QAC gene-positive isolates had higher MICs to benzalkonium chloride and chlorhexidine digluconate. CONCLUSIONS. Our results suggest that long-term use of multipurpose solutions containing quaternary ammonium compounds may select for carriage of organisms harboring QAC genes. As these genes are associated with antibiotic resistance, their increased prevalence in isolates from contact lens wearers is a concern.
ISSN: 0146-0404
EISSN: 1552-5783
DOI: 10.1167/iovs.15-16550
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