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S.H. Soukiasian; Microbiology of Explanted Punctal Plugs . Invest. Ophthalmol. Vis. Sci. 2004;45(13):4981.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To describe the microbial flora from explanted silicone punctal plugs. Methods: Retrospective review of microbial cultures of 19 punctal plugs explanted from 16 symptomatic patients for a variety of clinical reasons including keratitis, discomfort, partial extrusion, epiphora, conjunctival injection, and mucoid discharge. Results: The average duration plugs were in prior to explantation was 31.9 months. Positive cultures were obtained from all 19 plugs. A single organism was identified from 9 plugs, with 10 plugs having more than one organism. Ps. aeruginosa (Ps.) was the most frequent isolate being identified in 37% (7). The next most common isolates were S. aureus (26% (5)), CNS (16%(3)) and alpha hemolytic strep (16%(3)). Other organisms identified included Serratia (12.5%(2)), Stenotrophomonas (12.5%(2)), Klebsiella (12.5%)(2)) and single cases of Hemophilis, Moraxella, Citrobacter, Aspergillus and Candida. Conclusion: A high incidence of pathogenic organism was identified with Ps. being the most common. This may be due to the colonization of the punctal plugs by potential pathogenic species with the formation of bacterial biofilm and may account for some clinical symptoms and findings.
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