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Detection of virulence factors in Serratia strains isolated from contact lens-associated corneal ulcers.
Acta Ophthalmol. 2011 Jun; 89(4):382-7.AO

Abstract

PURPOSE

This paper reports on the microbiological findings pertaining to three Serratia isolates from soft contact lens-related corneal ulcers, which represent a complication of contact lens wear reported with increasing frequency.

METHODS

Bacterial identification and antibiotic susceptibility testing were performed using the Vitek system. Serratia's ability to form biofilm, produce gelatinase, elastase and alkaline protease, and invade human corneal epithelial (HCE) cells was investigated. The isolates' susceptibility to the following disinfectants was tested: (a) ReNu MultiPlus(®) , containing polyaminopropyl biguanide 0.0001%; (b) Opti-Free Express(®) , containing polyquaternium-1 0.001% and myristamidopropyldimethylamine 0.0005%; (c) Opti-Free Replenish(®) , containing polyquaternium-1 0.001% and myristamidopropyldimethylamine 0.0005%, and (d) Oxysept Comfort(®) , a one-step 3% hydrogen peroxide-catalase system.

RESULTS

Two Serratia marcescens and one Serratia liquefaciens were identified. All the strains were susceptible to aminoglycosides and fluoroquinolones. No isolate formed biofilm or significantly invaded HCE cells; all produced alkaline protease and gelatinase, but not elastase. Opti-Free Express(®) and Opti-Free Replenish(®) were active against S. liquefaciens, but failed to kill the S. marcescens isolates within the minimum recommended time (6 hours). ReNu MultiPlus(®) needed 6 hours to kill one strain of S. marcescens, which is 2 hours more than recommended. Conversely, Oxysept Comfort(®) was always effective within the minimum recommended time (6 hours).

CONCLUSIONS

The ability to produce alkaline protease and gelatinase may play a major role in the pathogenesis of contact lens-related Serratia keratitis. Several types of contact lens solutions may be ineffective in eradicating Serratia from contaminated contact lens cases within the minimum recommended time. Only exposure to Oxysept Comfort(®) was always effective against Serratia in this study.

Authors+Show Affiliations

Institute of Ophthalmology, University of Sassari, Sassari, Italy. apinna@uniss.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19845561

Citation

Pinna, Antonio, et al. "Detection of Virulence Factors in Serratia Strains Isolated From Contact Lens-associated Corneal Ulcers." Acta Ophthalmologica, vol. 89, no. 4, 2011, pp. 382-7.
Pinna A, Usai D, Sechi LA, et al. Detection of virulence factors in Serratia strains isolated from contact lens-associated corneal ulcers. Acta Ophthalmol. 2011;89(4):382-7.
Pinna, A., Usai, D., Sechi, L. A., Carta, A., & Zanetti, S. (2011). Detection of virulence factors in Serratia strains isolated from contact lens-associated corneal ulcers. Acta Ophthalmologica, 89(4), 382-7. https://doi.org/10.1111/j.1755-3768.2009.01689.x
Pinna A, et al. Detection of Virulence Factors in Serratia Strains Isolated From Contact Lens-associated Corneal Ulcers. Acta Ophthalmol. 2011;89(4):382-7. PubMed PMID: 19845561.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Detection of virulence factors in Serratia strains isolated from contact lens-associated corneal ulcers. AU - Pinna,Antonio, AU - Usai,Donatella, AU - Sechi,Leonardo A, AU - Carta,Arturo, AU - Zanetti,Stefania, Y1 - 2009/10/20/ PY - 2009/10/23/entrez PY - 2009/10/23/pubmed PY - 2011/9/2/medline SP - 382 EP - 7 JF - Acta ophthalmologica JO - Acta Ophthalmol VL - 89 IS - 4 N2 - PURPOSE: This paper reports on the microbiological findings pertaining to three Serratia isolates from soft contact lens-related corneal ulcers, which represent a complication of contact lens wear reported with increasing frequency. METHODS: Bacterial identification and antibiotic susceptibility testing were performed using the Vitek system. Serratia's ability to form biofilm, produce gelatinase, elastase and alkaline protease, and invade human corneal epithelial (HCE) cells was investigated. The isolates' susceptibility to the following disinfectants was tested: (a) ReNu MultiPlus(®) , containing polyaminopropyl biguanide 0.0001%; (b) Opti-Free Express(®) , containing polyquaternium-1 0.001% and myristamidopropyldimethylamine 0.0005%; (c) Opti-Free Replenish(®) , containing polyquaternium-1 0.001% and myristamidopropyldimethylamine 0.0005%, and (d) Oxysept Comfort(®) , a one-step 3% hydrogen peroxide-catalase system. RESULTS: Two Serratia marcescens and one Serratia liquefaciens were identified. All the strains were susceptible to aminoglycosides and fluoroquinolones. No isolate formed biofilm or significantly invaded HCE cells; all produced alkaline protease and gelatinase, but not elastase. Opti-Free Express(®) and Opti-Free Replenish(®) were active against S. liquefaciens, but failed to kill the S. marcescens isolates within the minimum recommended time (6 hours). ReNu MultiPlus(®) needed 6 hours to kill one strain of S. marcescens, which is 2 hours more than recommended. Conversely, Oxysept Comfort(®) was always effective within the minimum recommended time (6 hours). CONCLUSIONS: The ability to produce alkaline protease and gelatinase may play a major role in the pathogenesis of contact lens-related Serratia keratitis. Several types of contact lens solutions may be ineffective in eradicating Serratia from contaminated contact lens cases within the minimum recommended time. Only exposure to Oxysept Comfort(®) was always effective against Serratia in this study. SN - 1755-3768 UR - https://www.unboundmedicine.com/medline/citation/19845561/Detection_of_virulence_factors_in_Serratia_strains_isolated_from_contact_lens_associated_corneal_ulcers_ L2 - https://doi.org/10.1111/j.1755-3768.2009.01689.x DB - PRIME DP - Unbound Medicine ER -