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Molecular epidemiology of methicillin-resistant and methicillin-susceptible Staphylococcus aureus isolated from the eye.
Curr Eye Res 2011; 36(2):94-102CE

Abstract

PURPOSE

Methicillin-resistant Staphylococcus aureus (MRSA) strains are commonly classified as hospital-acquired (HA) or community-acquired (CA). Typical HA-MRSA isolates are characterized by multidrug resistance and the SCCmec type II cassette, while CA-MRSA isolates are generally susceptible to more drug classes, are often of SCCmec type IV, and frequently carry the Panton-Valentine leukocidin (PVL) genes. This study determined the presence of traits characteristic for CA and HA strains in ocular MRSA isolates.

MATERIALS AND METHODS

Fifty-six recent ocular isolates, consisting of 40 MRSA and 16 methicillin-susceptible Staphylococcus aureus (MSSA) comparator strains, were characterized. Minimum inhibitory concentration (MIC) testing was done according to current Clinical and Laboratory Standards Institute guidelines. Detection of the PVL encoding genes and determination of the SCCmec type was done by polymerase chain reaction (PCR), while spa typing and cluster analysis was performed following DNA sequencing.

RESULTS

Of the 38 typeable MRSA isolates, 22 were of SCCmec type II and 16 were of SCCmec type IV. All SCCmec type II isolates were multidrug-resistant, lacked the PVL genes, and were of spa type t002 or closely related spa types. In contrast, the SCCmec type IV isolates were resistant to fewer classes of antimicrobial agents, often possessed the PVL genes (75.0%), and were of spa type t008 or closely related spa types.

CONCLUSIONS

While the majority of ocular MRSA strains in this study fit the classical profile of HA- and CA-MRSA, some CA-MRSA isolates exhibited higher levels of antimicrobial resistance, which should be of particular concern to eye-care professionals. Furthermore, the apparent association of spa types and SCCmec types observed here warrants further investigation and suggests that spa typing may be useful in future HA- and CA-MRSA characterization studies.

Authors+Show Affiliations

Bausch & Lomb, Inc., Rochester, New York, USA. christine.hesje@bausch.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Multicenter Study

Language

eng

PubMed ID

21158584

Citation

Hesje, Christine K., et al. "Molecular Epidemiology of Methicillin-resistant and Methicillin-susceptible Staphylococcus Aureus Isolated From the Eye." Current Eye Research, vol. 36, no. 2, 2011, pp. 94-102.
Hesje CK, Sanfilippo CM, Haas W, et al. Molecular epidemiology of methicillin-resistant and methicillin-susceptible Staphylococcus aureus isolated from the eye. Curr Eye Res. 2011;36(2):94-102.
Hesje, C. K., Sanfilippo, C. M., Haas, W., & Morris, T. W. (2011). Molecular epidemiology of methicillin-resistant and methicillin-susceptible Staphylococcus aureus isolated from the eye. Current Eye Research, 36(2), pp. 94-102. doi:10.3109/02713683.2010.534229.
Hesje CK, et al. Molecular Epidemiology of Methicillin-resistant and Methicillin-susceptible Staphylococcus Aureus Isolated From the Eye. Curr Eye Res. 2011;36(2):94-102. PubMed PMID: 21158584.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Molecular epidemiology of methicillin-resistant and methicillin-susceptible Staphylococcus aureus isolated from the eye. AU - Hesje,Christine K, AU - Sanfilippo,Christine M, AU - Haas,Wolfgang, AU - Morris,Timothy W, Y1 - 2010/12/15/ PY - 2010/12/17/entrez PY - 2010/12/17/pubmed PY - 2011/5/3/medline SP - 94 EP - 102 JF - Current eye research JO - Curr. Eye Res. VL - 36 IS - 2 N2 - PURPOSE: Methicillin-resistant Staphylococcus aureus (MRSA) strains are commonly classified as hospital-acquired (HA) or community-acquired (CA). Typical HA-MRSA isolates are characterized by multidrug resistance and the SCCmec type II cassette, while CA-MRSA isolates are generally susceptible to more drug classes, are often of SCCmec type IV, and frequently carry the Panton-Valentine leukocidin (PVL) genes. This study determined the presence of traits characteristic for CA and HA strains in ocular MRSA isolates. MATERIALS AND METHODS: Fifty-six recent ocular isolates, consisting of 40 MRSA and 16 methicillin-susceptible Staphylococcus aureus (MSSA) comparator strains, were characterized. Minimum inhibitory concentration (MIC) testing was done according to current Clinical and Laboratory Standards Institute guidelines. Detection of the PVL encoding genes and determination of the SCCmec type was done by polymerase chain reaction (PCR), while spa typing and cluster analysis was performed following DNA sequencing. RESULTS: Of the 38 typeable MRSA isolates, 22 were of SCCmec type II and 16 were of SCCmec type IV. All SCCmec type II isolates were multidrug-resistant, lacked the PVL genes, and were of spa type t002 or closely related spa types. In contrast, the SCCmec type IV isolates were resistant to fewer classes of antimicrobial agents, often possessed the PVL genes (75.0%), and were of spa type t008 or closely related spa types. CONCLUSIONS: While the majority of ocular MRSA strains in this study fit the classical profile of HA- and CA-MRSA, some CA-MRSA isolates exhibited higher levels of antimicrobial resistance, which should be of particular concern to eye-care professionals. Furthermore, the apparent association of spa types and SCCmec types observed here warrants further investigation and suggests that spa typing may be useful in future HA- and CA-MRSA characterization studies. SN - 1460-2202 UR - https://www.unboundmedicine.com/medline/citation/21158584/Molecular_epidemiology_of_methicillin_resistant_and_methicillin_susceptible_Staphylococcus_aureus_isolated_from_the_eye_ L2 - http://www.tandfonline.com/doi/full/10.3109/02713683.2010.534229 DB - PRIME DP - Unbound Medicine ER -