Antibiotic resistance patterns of methicillin-susceptible Staphylococcus aureus and methicillin-resistant Staphylococcus aureus isolates in keratitis: Insights from an 11-year analysis.

However, the ongoing antibiotic resistance monitoring in ocular microorganisms (ARMOR) surveillance study in the United States has demonstrated a decreasing trend in SA resistance to multiple antibiotic classes, including methicillin and oxacillin, since 2009.[ 11 ] Our study found no significant change in the prevalence of MRSA keratitis between 2013 and 2023, with proportions ranging from 12.5% in 2020 to 75% in 2018.

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Interestingly, resistance in MSSA isolates has also shown an increasing trend.

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